Automatic electrical controls - Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements

IEC 60730-2-6:2025 applies to automatic electrical pressure sensing controls
• for use in, on, or in association with equipment for household appliance and similar use;
NOTE 1 Throughout this document, the word "equipment" means "appliance and equipment" and "controls" means "pressure sensing controls".
• for building automation within the scope of ISO 16484 series and IEC 63044 series (HBES/BACS);
EXAMPLE 1 Independently mounted automatic electrical pressure sensing controls, controls in smart grid systems and controls for building automation systems within the scope of ISO 16484-2.
• for equipment that is used by the public, such as equipment intended to be used in shops, offices, hospitals, farms and commercial and industrial applications;
EXAMPLE 2 Automatic electrical pressure sensing controls for commercial catering, heating and air-conditioning equipment.
• that are smart enabled automatic electrical pressure sensing controls;
EXAMPLE 3 Smart grid automatic electrical pressure sensing controls, remote interfaces/control of energy-consuming equipment including computer or smart phone.
• that are AC or DC powered controls with a rated voltage not exceeding 690 V AC or 600 V DC;
• used in, on, or in association with equipment that use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof;
• utilized as part of a control system or controls which are mechanically integral with multifunctional controls having non-electrical outputs;
• using NTC or PTC thermistors and to discrete thermistors, requirements for which are contained in Annex J;
• that are mechanically or electrically operated, responsive to or controlling a pressure or vacuum;
• as well as manual controls when such are electrically and/or mechanically integral with automatic controls.
NOTE 2 Requirements for manually actuated mechanical switches not forming part of an automatic control are contained in IEC 61058-1-1.
This document is also applicable to individual pressure sensing controls utilized as part of a control system or pressure sensing controls which are mechanically integral with multi-functional controls having non-electrical outputs.
This document is also applicable to pressure sensing controls for appliances within the scope of IEC 60335-1.
This document applies to
- the inherent safety of pressure sensing controls, and
- functional safety of pressure sensing controls and safety related systems,
- pressure sensing controls where the performance (for example the effect of EMC phenomena) of the product can impair the overall safety and performance of the controlled system,
- the operating values, operating times, and operating sequences where such are associated with equipment safety.
This document specifies the requirements for construction, operation and testing of automatic electrical controls used in, on, or in association with an equipment.
This document does not
• apply to pressure sensing controls intended exclusively for industrial process applications unless explicitly mentioned in the relevant part 2 or the equipment standard. However, this document can be applied to evaluate automatic electrical controls intended specifically for industrial applications in cases where no relevant safety standard exists;
• take into account the response value of an automatic action of a pressure sensing control, if such a response value is dependent upon the method of mounting the control in the equipment. Where a response value is of significant purpose for the protection of the user, or surroundings, the value defined in the appropriate equipment standard or as determined by the manufacturer will apply;
• address the integrity of the output signal to the network devices, such as interoperability with other devices unless it has been evaluated as part of the control system.
This document contains requirements for electrical features of pressure sensing controls and requirements for mechanical featu

Dispositifs de commande électriques automatiques - Partie 2-6: Exigences particulières pour les dispositifs de commande électriques automatiques sensibles à la pression, y compris les exigences mécaniques

L'IEC 60730-2-6:2025 s'applique aux dispositifs de commande électrique automatiques sensibles à la pression
− utilisés dans, sur ou avec des matériels pour appareil domestique et usage analogue;
NOTE 1 Dans le présent document, le terme "matériel" signifie "appareil et matériel" et "dispositifs de commande" signifie "dispositifs de commande sensibles à la pression".
− pour l'automatisation des bâtiments qui relèvent du domaine d'application de la série ISO 16484 et de la série IEC 63044 (HBES/BACS);
EXEMPLE 1 Les dispositifs de commande électrique automatiques sensibles à la pression montés indépendamment, les dispositifs de commande des systèmes de réseau intelligent et les dispositifs de commande des systèmes d'automatisation des bâtiments qui relèvent du domaine d'application de l'ISO 16484-2.
− pour des matériels utilisés par le public, tels que les matériels destinés à être utilisés dans des magasins, des bureaux, des hôpitaux, des fermes et des applications commerciales et industrielles;
EXEMPLE 2 Les dispositifs de commande électrique automatiques sensibles à la pression pour les installations de restauration, de chauffage et d'air conditionné.
− qui sont des dispositifs de commande électrique automatiques activés intelligents sensibles à la pression;
EXEMPLE 3 Les dispositifs de commande électrique automatiques sensibles à la pression de réseau intelligent, les interfaces distantes/dispositifs de commande de matériels utilisateurs d'énergie électrique, y compris les ordinateurs ou les mobiles multifonctions.
− qui sont des dispositifs de commande à courant alternatif ou continu dont la tension assignée ne dépasse pas 690 V en courant alternatif ou 600 V en courant continu;
− qui sont utilisés dans, sur ou avec des matériels qui utilisent l'électricité, le gaz, le pétrole, des combustibles solides, l'énergie thermique solaire, etc. ou une combinaison de ces sources d'énergie;
− qui sont utilisés dans le cadre d'un système de commande ou de dispositifs de commande qui sont mécaniquement intégrés à des dispositifs de commande multifonctions comportant des sorties non électriques;
− qui utilisent des thermistances CTN ou CTP ainsi qu'aux dispositifs à thermistances discrètes, dont les exigences sont fournies à l'Annexe J;
− qui sont actionnés mécaniquement ou électriquement, qui commandent ou sont sensibles à la pression ou au vide;
− ainsi qu'aux dispositifs de commande manuels qui sont électriquement et/ou mécaniquement intégrés à des dispositifs de commande automatique.
NOTE 2 Les exigences relatives aux interrupteurs mécaniques à action manuelle qui ne font pas partie d'un dispositif de commande automatique sont contenues dans l'IEC 61058-1-1.
Le présent document s'applique également aux différents dispositifs de commande sensibles à la pression qui sont utilisés dans le cadre d'un système de commande ou aux dispositifs de commande sensibles à la pression qui sont mécaniquement intégrés à des dispositifs de commande multifonctions comportant des sorties non électriques.
Le présent document s'applique également aux dispositifs de commande sensibles à la pression pour appareils qui relèvent du domaine d'application de l'IEC 60335-1.
Le présent document s'applique
− à la sécurité intrinsèque des dispositifs de commande sensibles à la pression; et
− à la sécurité fonctionnelle des dispositifs de commande sensibles à la pression et des systèmes de sécurité;
− aux dispositifs de commande sensibles à la pression pour lesquels les performances (par exemple, l'effet des phénomènes CEM) du produit peuvent compromettre la sécurité et les performances globales du système commandé;
− aux valeurs de fonctionnement, aux temps de fonctionnement et aux séquences de fonctionnement lorsque ces éléments interviennent dans la sécurité du matériel.
Le présent document spécifie les exigences relatives à la construction, au fonctionnement et aux essais des dispositifs de commande électrique automatiques utilisés dans, s

General Information

Status
Published
Publication Date
13-Aug-2025
Drafting Committee
WG 6 - TC 72/WG 6
Current Stage
PPUB - Publication issued
Start Date
14-Aug-2025
Completion Date
15-Aug-2025

Relations

Effective Date
14-Jun-2024
Effective Date
26-Jan-2024

Overview

IEC 60730-2-6:2025 specifies particular requirements for automatic electrical pressure sensing controls, including mechanical requirements. It applies to pressure sensing controls used in household appliances, building automation (within ISO 16484 / IEC 63044 scope), public equipment (shops, hospitals, commercial/industrial sites), and smart‑enabled controls. The standard addresses construction, operation and testing for AC or DC powered controls (rated ≤ 690 V AC or ≤ 600 V DC) and covers inherent safety, functional safety, EMC‑related performance effects, and safety‑related operating values, times and sequences.

Key topics and requirements

The standard complements IEC 60730-1 and contains detailed technical requirements and tests, including:

  • Construction and materials - enclosure, mounting, and mechanical integrity requirements.
  • Protection against electric shock - insulation, covers and protective earthing provisions.
  • Terminals, terminations and connectors - requirements for internal and external conductors.
  • Creepage, clearance and solid insulation - electrical separation distances for safety.
  • Components and electronic circuits - transformers, capacitors, relays, thermistors (Annex J), and fault assessment for inherent and functional safety.
  • Mechanical strength and endurance - impact, flexing, hydrostatic tests and lifecycle aging.
  • Environmental and climatic tests - moisture, dust, temperature, transportation and storage stresses.
  • Heating, tracking and fire resistance - thermal tests and resistance to tracking.
  • Controls using software - software‑related requirements, error avoidance, memory tests and functional safety considerations.
  • Marking and technical information - required labeling, warning markings and documentation for safe installation and use.

Note: IEC 60730-2-6 does not generally apply to industrial process controls unless explicitly referenced by the relevant part 2 or equipment standard; it also does not cover interoperability of output signals unless evaluated as part of the control system.

Practical applications

IEC 60730-2-6 is used to design, test and certify pressure sensing controls for:

  • Household appliances (e.g., boilers, water heaters, cookers)
  • HVAC and building automation systems (including HBES/BACS)
  • Commercial catering and industrial equipment for public use
  • Smart grid and remote‑controlled energy systems with pressure control elements

Compliance ensures safety, reliability and regulatory acceptance of pressure sensing controls in consumer, commercial and building automation products.

Who should use this standard

  • Appliance and control manufacturers
  • Product safety and compliance engineers
  • Test laboratories and certification bodies
  • System integrators and OEMs designing HVAC and building automation systems

Related standards

  • IEC 60730-1 (general requirements)
  • ISO 16484 series and IEC 63044 series (building automation)
  • IEC 60335-1 (appliances safety)
  • IEC 61058-1-1 (manual mechanical switches - note on exclusions)

Keywords: IEC 60730-2-6, automatic electrical pressure sensing controls, pressure sensing controls, mechanical requirements, functional safety, building automation, IEC standard.

Buy Documents

Standard

IEC 60730-2-6:2025 - Automatic electrical controls - Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements Released:8/14/2025 Isbn:9782832705988

English language (36 pages)
sale 15% off
Preview
sale 15% off
Preview
Standard

IEC 60730-2-6:2025 EXV - Automatic electrical controls - Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements Released:8/14/2025 Isbn:9782832706619

English language (328 pages)
sale 15% off
Preview
sale 15% off
Preview
Standard

IEC 60730-2-6:2025 - Dispositifs de commande électriques automatiques - Partie 2-6: Exigences particulières pour les dispositifs de commande électriques automatiques sensibles à la pression, y compris les exigences mécaniques Released:8/14/2025 Isbn:9782832705988

French language (39 pages)
sale 15% off
Preview
sale 15% off
Preview
Standard

IEC 60730-2-6:2025 - Automatic electrical controls - Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements Released:8/14/2025 Isbn:9782832705988

English and French language (75 pages)
sale 15% off
Preview
sale 15% off
Preview

Frequently Asked Questions

IEC 60730-2-6:2025 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Automatic electrical controls - Part 2-6: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements". This standard covers: IEC 60730-2-6:2025 applies to automatic electrical pressure sensing controls • for use in, on, or in association with equipment for household appliance and similar use; NOTE 1 Throughout this document, the word "equipment" means "appliance and equipment" and "controls" means "pressure sensing controls". • for building automation within the scope of ISO 16484 series and IEC 63044 series (HBES/BACS); EXAMPLE 1 Independently mounted automatic electrical pressure sensing controls, controls in smart grid systems and controls for building automation systems within the scope of ISO 16484-2. • for equipment that is used by the public, such as equipment intended to be used in shops, offices, hospitals, farms and commercial and industrial applications; EXAMPLE 2 Automatic electrical pressure sensing controls for commercial catering, heating and air-conditioning equipment. • that are smart enabled automatic electrical pressure sensing controls; EXAMPLE 3 Smart grid automatic electrical pressure sensing controls, remote interfaces/control of energy-consuming equipment including computer or smart phone. • that are AC or DC powered controls with a rated voltage not exceeding 690 V AC or 600 V DC; • used in, on, or in association with equipment that use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof; • utilized as part of a control system or controls which are mechanically integral with multifunctional controls having non-electrical outputs; • using NTC or PTC thermistors and to discrete thermistors, requirements for which are contained in Annex J; • that are mechanically or electrically operated, responsive to or controlling a pressure or vacuum; • as well as manual controls when such are electrically and/or mechanically integral with automatic controls. NOTE 2 Requirements for manually actuated mechanical switches not forming part of an automatic control are contained in IEC 61058-1-1. This document is also applicable to individual pressure sensing controls utilized as part of a control system or pressure sensing controls which are mechanically integral with multi-functional controls having non-electrical outputs. This document is also applicable to pressure sensing controls for appliances within the scope of IEC 60335-1. This document applies to - the inherent safety of pressure sensing controls, and - functional safety of pressure sensing controls and safety related systems, - pressure sensing controls where the performance (for example the effect of EMC phenomena) of the product can impair the overall safety and performance of the controlled system, - the operating values, operating times, and operating sequences where such are associated with equipment safety. This document specifies the requirements for construction, operation and testing of automatic electrical controls used in, on, or in association with an equipment. This document does not • apply to pressure sensing controls intended exclusively for industrial process applications unless explicitly mentioned in the relevant part 2 or the equipment standard. However, this document can be applied to evaluate automatic electrical controls intended specifically for industrial applications in cases where no relevant safety standard exists; • take into account the response value of an automatic action of a pressure sensing control, if such a response value is dependent upon the method of mounting the control in the equipment. Where a response value is of significant purpose for the protection of the user, or surroundings, the value defined in the appropriate equipment standard or as determined by the manufacturer will apply; • address the integrity of the output signal to the network devices, such as interoperability with other devices unless it has been evaluated as part of the control system. This document contains requirements for electrical features of pressure sensing controls and requirements for mechanical featu

IEC 60730-2-6:2025 applies to automatic electrical pressure sensing controls • for use in, on, or in association with equipment for household appliance and similar use; NOTE 1 Throughout this document, the word "equipment" means "appliance and equipment" and "controls" means "pressure sensing controls". • for building automation within the scope of ISO 16484 series and IEC 63044 series (HBES/BACS); EXAMPLE 1 Independently mounted automatic electrical pressure sensing controls, controls in smart grid systems and controls for building automation systems within the scope of ISO 16484-2. • for equipment that is used by the public, such as equipment intended to be used in shops, offices, hospitals, farms and commercial and industrial applications; EXAMPLE 2 Automatic electrical pressure sensing controls for commercial catering, heating and air-conditioning equipment. • that are smart enabled automatic electrical pressure sensing controls; EXAMPLE 3 Smart grid automatic electrical pressure sensing controls, remote interfaces/control of energy-consuming equipment including computer or smart phone. • that are AC or DC powered controls with a rated voltage not exceeding 690 V AC or 600 V DC; • used in, on, or in association with equipment that use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof; • utilized as part of a control system or controls which are mechanically integral with multifunctional controls having non-electrical outputs; • using NTC or PTC thermistors and to discrete thermistors, requirements for which are contained in Annex J; • that are mechanically or electrically operated, responsive to or controlling a pressure or vacuum; • as well as manual controls when such are electrically and/or mechanically integral with automatic controls. NOTE 2 Requirements for manually actuated mechanical switches not forming part of an automatic control are contained in IEC 61058-1-1. This document is also applicable to individual pressure sensing controls utilized as part of a control system or pressure sensing controls which are mechanically integral with multi-functional controls having non-electrical outputs. This document is also applicable to pressure sensing controls for appliances within the scope of IEC 60335-1. This document applies to - the inherent safety of pressure sensing controls, and - functional safety of pressure sensing controls and safety related systems, - pressure sensing controls where the performance (for example the effect of EMC phenomena) of the product can impair the overall safety and performance of the controlled system, - the operating values, operating times, and operating sequences where such are associated with equipment safety. This document specifies the requirements for construction, operation and testing of automatic electrical controls used in, on, or in association with an equipment. This document does not • apply to pressure sensing controls intended exclusively for industrial process applications unless explicitly mentioned in the relevant part 2 or the equipment standard. However, this document can be applied to evaluate automatic electrical controls intended specifically for industrial applications in cases where no relevant safety standard exists; • take into account the response value of an automatic action of a pressure sensing control, if such a response value is dependent upon the method of mounting the control in the equipment. Where a response value is of significant purpose for the protection of the user, or surroundings, the value defined in the appropriate equipment standard or as determined by the manufacturer will apply; • address the integrity of the output signal to the network devices, such as interoperability with other devices unless it has been evaluated as part of the control system. This document contains requirements for electrical features of pressure sensing controls and requirements for mechanical featu

IEC 60730-2-6:2025 is classified under the following ICS (International Classification for Standards) categories: 97.120 - Automatic controls for household use. The ICS classification helps identify the subject area and facilitates finding related standards.

IEC 60730-2-6:2025 has the following relationships with other standards: It is inter standard links to IEC 60730-2-6:2015/AMD1:2019, IEC 60730-2-6:2015. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

IEC 60730-2-6:2025 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


IEC 60730-2-6 ®
Edition 4.0 2025-08
INTERNATIONAL
STANDARD
Automatic electrical controls -
Part 2-6: Particular requirements for automatic electrical pressure sensing
controls including mechanical requirements
ICS 97.120  ISBN 978-2-8327-0598-8

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright
or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local
IEC member National Committee for further information.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the
The advanced search enables to find IEC publications by a publications previews, graphical symbols and the glossary.
variety of criteria (reference number, text, technical With a subscription you will always have access to up to date
committee, …). It also gives information on projects, content tailored to your needs.
replaced and withdrawn publications.
Electropedia - www.electropedia.org
The world's leading online dictionary on electrotechnology,
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English
details all new publications released. Available online and and French, with equivalent terms in 25 additional languages.
once a month by email. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer
Service Centre: sales@iec.ch.
CONTENTS
FOREWORD . 3
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
4 General . 8
5 Required technical information . 9
6 Protection against electric shock . 10
7 Provision for protective earthing . 10
8 Terminals and terminations. 10
9 Constructional requirements . 10
10 Threaded parts and connections . 12
11 Creepage distances, clearances and distances through solid insulation . 12
12 Components . 12
13 Fault assessment on electronic circuits . 12
14 Moisture and dust resistance . 12
15 Electric strength and insulation resistance . 12
16 Heating . 12
17 Manufacturing deviation and drift . 13
18 Environmental stress . 13
19 Endurance . 13
20 Mechanical strength . 14
21 Resistance to heat, fire and tracking . 15
22 Resistance to corrosion . 15
23 Electromagnetic compatibility (EMC) requirements - Emission . 15
24 Normal operation . 15
25 Electromagnetic compatibility (EMC) requirements - Immunity . 16
26 Abnormal operation tests . 16
Annex H (normative) Requirements related to functional safety . 17
Annex Q (informative) Regional differences relevant for the member countries of
Cenelec . 28
Annex R (informative) National differences relevant in the United States of America . 29
Annex S (informative) National differences relevant in Japan . 30
Annex T (informative) National differences relevant in Canada . 31
Annex AA (normative) Number of cycles . 32
Annex BB (informative) Stainless steel for bellows, bourdon tubes or similar elements . 33
Bibliography . 36

Table 1 – Required technical information and methods of providing these information . 9
Table H.1 – Additional items to Table 1 . 17
Table AA.1 – Number of cycles for independently mounted controls . 32
Table AA.2 – Cycling rate for independently mounted controls . 32
Table BB.1 - Stainless steel for bellows, bourdon tubes or similar elements. 33

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Automatic electrical controls -
Part 2-6: Particular requirements for automatic electrical pressure
sensing controls including mechanical requirements

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60730-2-6 has been prepared by IEC technical committee 72: Automatic electrical controls.
It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2015 and its
Amendment 1:2019. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
Adoption of IEC 60730-1:2022 with all of its significant changes to IEC 60730-1:2013,
IEC 60730-1:2013/AMD 1:2015 and IEC 60730-1:2013/AMD2:2020.
The text of this International Standard is based on the following documents:
Draft Report on voting
72/1486/FDIS 72/1504/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts of the IEC 60730 series, under the general title: Automatic electrical controls,
can be found on the IEC website.
This part 2-6 is intended to be used in conjunction with IEC 60730-1. It was established on the
basis of the sixth edition of that standard (2022). Consideration may be given to future editions
of, or amendments to, IEC 60730-1.
This part 2-6 supplements or modifies the corresponding clauses in IEC 60730-1, so as to
convert that publication into the IEC standard: Particular requirements for automatic electrical
pressure sensing controls including mechanical requirements.
Where this part 2-6 states "addition", "modification" or "replacement", the relevant requirement,
test specification or explanatory matter in part 1 should be adapted accordingly.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies.
In the development of a fully international standard, it has been necessary to take into
consideration the differing requirements resulting from practical experience in various parts of
the world and to recognize the variation in national electrical systems and wiring rules.
The reader's attention is drawn to the fact that Annex Q, Annex R, Annex S and Annex T list all
of the "in-some-country" clauses on differing practices of a less permanent nature relating to
the subject of this document.
In this publication:
The following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– explanatory matter: in smaller roman type;
– defined terms: bold type.
Subclauses, notes or items which are additional to those in Part 1 are numbered starting from
101, additional annexes are lettered AA, BB, etc.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
1 Scope
This clause of Part 1 is replaced by the following:
This document applies to automatic electrical pressure sensing controls
– for use in, on, or in association with equipment for household appliance and similar use;
NOTE 1 Throughout this document, the word "equipment" means "appliance and equipment" and "controls" means
"pressure sensing controls".
– for building automation within the scope of ISO 16484 series and IEC 63044 series
(HBES/BACS);
EXAMPLE 1 Independently mounted automatic electrical pressure sensing controls, controls in smart grid
systems and controls for building automation systems within the scope of ISO 16484-2.
– for equipment that is used by the public, such as equipment intended to be used in shops,
offices, hospitals, farms and commercial and industrial applications;
EXAMPLE 2 Automatic electrical pressure sensing controls for commercial catering, heating and air-conditioning
equipment.
– that are smart enabled automatic electrical pressure sensing controls;
EXAMPLE 3 Smart grid automatic electrical pressure sensing controls, remote interfaces/control of energy-
consuming equipment including computer or smart phone.
– that are AC or DC powered controls with a rated voltage not exceeding 690 V AC or 600 V
DC;
– used in, on, or in association with equipment that use electricity, gas, oil, solid fuel, solar
thermal energy, etc., or a combination thereof;
– utilized as part of a control system or controls which are mechanically integral with
multifunctional controls having non-electrical outputs;
– using NTC or PTC thermistors and to discrete thermistors, requirements for which are
contained in Annex J;
– that are mechanically or electrically operated, responsive to or controlling a pressure or
vacuum;
– as well as manual controls when such are electrically and/or mechanically integral with
automatic controls.
NOTE 2 Requirements for manually actuated mechanical switches not forming part of an automatic control are
contained in IEC 61058-1-1.
This document is also applicable to individual pressure sensing controls utilized as part of a
control system or pressure sensing controls which are mechanically integral with multi-
functional controls having non-electrical outputs.
This document is also applicable to pressure sensing controls for appliances within the scope
of IEC 60335-1.
This document applies to
– the inherent safety of pressure sensing controls, and
– functional safety of pressure sensing controls and safety related systems,
– pressure sensing controls where the performance (for example the effect of EMC
phenomena) of the product can impair the overall safety and performance of the controlled
system,
– the operating values, operating times, and operating sequences where such are associated
with equipment safety.
This document specifies the requirements for construction, operation and testing of automatic
electrical controls used in, on, or in association with an equipment.
This document does not
– apply to pressure sensing controls intended exclusively for industrial process applications
unless explicitly mentioned in the relevant part 2 or the equipment standard. However, this
document can be applied to evaluate automatic electrical controls intended specifically for
industrial applications in cases where no relevant safety standard exists;
– take into account the response value of an automatic action of a pressure sensing control,
if such a response value is dependent upon the method of mounting the control in the
equipment. Where a response value is of significant purpose for the protection of the user,
or surroundings, the value defined in the appropriate equipment standard or as determined
by the manufacturer will apply;
– address the integrity of the output signal to the network devices, such as interoperability
with other devices unless it has been evaluated as part of the control system.
This document contains requirements for electrical features of pressure sensing controls and
requirements for mechanical features that affect their intended operation.
NOTE Subclause 20.101, as it pertains to gas and/or oil controls, is under consideration pending review or revision
of ISO 22967, ISO 22968 and ISO 23550, if applicable.
In general, these pressure sensing controls are integrated or incorporated with the equipment
or are intended to be integrated in, or on the equipment. This document also covers these
controls when they are independently mounted. In-line cord controls are not covered by this
document.
2 Normative references
This clause of Part 1 is applicable.
3 Terms and definitions
This clause of Part 1 is applicable except as follows:
3.2 Definitions of types of control according to purpose
Additional definitions:
3.2.101
pressure limiter
pressure sensing control which is intended to keep a pressure below or above a predetermined
value during normal operating conditions and which can have provision for setting by the user
Note 1 to entry: A pressure limiter may be of the automatic or of the manual reset type. It does not make the
reverse operation during the normal duty cycle of the equipment.
3.2.102
pressure operating control
pressure sensing control set at a high or low pressure, or both, between which limits the
equipment is normally intended to operate
3.2.103
pressure cut-out
pressure sensing control intended to keep a pressure below or above one particular value
during abnormal operating conditions of the equipment and which has no provisions for setting
by the user
Note 1 to entry: A pressure cut-out may be of the automatic or of the manual reset type.
Note 2 to entry: A pressure cut-out will provide a Type 2 action.
Note 3 to entry: A pressure cut-out may have an adjustable stop intended to be set by the control manufacturer,
the equipment manufacturer or the installer.
3.3 Definitions relating to the function of controls
Additional definitions:
3.3.101
pressure medium
medium used to transmit the pressure to the pressure sensing element
Note 1 to entry: Pressure medium as used in this document refers to either gases or liquids.
3.3.102
permanent operation
continuous monitoring of the protective function during the operation of the appliance or
system for longer than 24 h
Note 1 to entry: 24 h is considered the typical time interval between a first and a second fault.
3.3.103
non-permanent operation
continuous monitoring of the protective function during the operation of the appliance or
system for less than 24 h
Note 1 to entry: 24 h is considered the typical time interval between a first and a second fault.
3.8 Definitions relating to component parts of controls
Additional definition:
3.8.101
vent
that opening from the atmospheric side of a diaphragm to the atmosphere through which air is
discharged or drawn in when the control is functioning
4 General
This clause of Part 1 is applicable except as follows:
4.3 General notes on tests
4.3.2 Conditions of test
4.3.2.7 Replacement:
The rates of pressure change declared in Table 1 requirement 31, and used in Clause 19 (i.e.
α , β , α , β ) shall have test tolerances as declared by the manufacturer.
1 1 2 2
4.3.4 Instructions for test
4.3.4.1 According to submission
Additional subclause:
4.3.4.1.101 The values in Annex AA apply for the testing of independently mounted pressure
sensing controls in Clause 19. Values for integrated and incorporated controls are specified
in the appropriate equipment standard.
5 Required technical information
5.2 Methods of providing technical information
This clause of Part 1 is applicable except as follows:
Table 1 – Required technical information and methods of providing these information
Clause or
Method
Information
subclause
Replacement:
X
19 Number of cycles of actuation (M) for each manual action Annex AA,
Preferred values are: 100 000 cycles; 30 000 cycles; 10 000 cycles; 19.10, 19.11
j j j
6 000 cycles; 3 000 cycles ; 300 cycles ; 30 cycles
NOTE For controls with more than one manual action, a different value can
be declared for each. If a control has more than one intended "OFF" position,
then a cycle of actuation is regarded as a movement from one "OFF" position
to the next "OFF" position.
X
20 Number of automatic cycles (A) for each automatic action. Annex AA,
Preferred values are: 300 000 cycles; 200 000 cycles; 100 000 cycles; 13.1.3.3,
a
Table 14,
30 000 cycles; 20 000 cycles; 10 000 cycles; 6 000 cycles; 3 000 cycles ;
a b bd c
19.7.6,
1 000 cycles ; 300 cycles ; 30 cycles ; 1 cycle .
19.8.4
1) Not applicable to thermostats or to other fast cycling actions.
2) Applicable only to manual reset.
3) Applicable only to actions which require the replacement of a part after
each operation.
4) Can only be reset during manufacturer servicing.
NOTE For controls having more than one automatic action, a different value
can be declared for each.
29 Not applicable
38 Not applicable
42 Operating pressure (or pressures) 3.3.11, 17,
H.17.4
52 Not applicable
Additional items:
101 Pressure medium 3.3.101,
X
9.3.101,
20.101
102 Operating differential 3.3.25,
D
H.17.4
H.17.6
103 Maximum working pressure 3.3.28, 9,
D
19, 20
Addition to Footnote h:
For pressure sensing controls, limits of activating quantity are specified either in the applicable appliance
standard, by the appliance manufacturer or as declared by the pressure sensing control manufacturer
(see 19.7 and 19.8).
6 Protection against electric shock
This clause of Part 1 is applicable.
7 Provision for protective earthing
This clause of Part 1 is applicable.
8 Terminals and terminations
This clause of Part 1 is applicable.
9 Constructional requirements
This clause of Part 1 is applicable except as follows:
9.4 Actions
Additional subclause:
9.4.101 Type 2.N action (for sensing actions, no increase in the operating value as a
result of any leakage from the sensing element or from parts connecting the
sensing element to the switch head)
A Type 2.N action shall be so designed that in the event of a leak in the sensing element, or
in any other part between the sensing element and the switch head, the declared disconnection
or interruption is provided before the sum of the declared operating pressure and drift is
exceeded.
Compliance is checked by the following test:
The operating pressure of a Type 2.N control shall be measured under the conditions of
Clause 17. If the control has means for setting, it shall be set to the highest value.
After this measurement, a hole is artificially produced in the sensing element and the
measurement of the operating pressure is repeated.
No positive drift is allowed beyond the declared value.
A separate shroud or sleeve may be employed for protection of the sensing element to achieve
conformance with Clause 20.
NOTE The test can be replaced by theoretical computations of the physical mode of operation.
9.11 Requirements during mounting, use, maintenance and servicing
Additional subclauses:
9.11.101 Parts in contact with a diaphragm shall have no sharp burrs, projections or the like
which chafe or abrade the diaphragm.
Compliance is checked by inspection before and after the tests of Clause 19.
9.11.102 An operating spring shall be retained and arranged to prevent abrasion, binding,
buckling or interference with its free movement.
Compliance is checked by inspection before and after the tests of Clause 19.
9.11.103 If failure of any part of the control would allow unsafe leakage of a hazardous fluid,
that part shall be made of a material having a melting point (solidus temperature) of not less
than 510 °C and a tensile strength of not less than 68 MPa at 204 °C.
Such parts shall not sag, distort, melt, oxidize or show leakage of fluid during any of the tests
specified herein.
Compliance is checked by inspection before and after the tests of Clause 19.
9.11.104 A part including a sheath, capillary tube, bellows or diaphragm shall be resistant to
atmospheric corrosion and attack by the fluid it can normally contact in service, if failure of the
part will permit external fluid leakage of a combustible fluid or cause the control to malfunction.
NOTE Brass alloys containing less than 81 % copper and more than 9 % zinc are not considered resistant to the
corrosive effects of fuel oils.
9.11.105 A control in which a flexible diaphragm, bellows or similar construction constitutes
the only flammable gas or fluid seal shall have the atmospheric side of the diaphragm or bellows
enclosed in a casing designed to limit external fluid leakage in the event of a diaphragm or
bellows rupture or shall have provisions for connection of a vent pipe or tubing intended to be
routed to the outdoors or other safe location.
2 2
9.11.106 A control designed to supervise the pressure of fuel oil of 1,00 mm /s to 600 mm /s
viscosity is not required to conform to 20.101 and 20.102, provided three samples of the control,
when subjected to a 100 000 cycle endurance test, show no evidence of leakage during the test
and when subjected to a hydrostatic test of four times the maximum working pressure, following
the endurance test, and the control conforms to one of the following:
a) the bellows, Bourdon tube, diaphragm or similar element is made of stainless steel or
material of equivalent resistance to corrosion designated material class A, if leakage from
a ruptured element will be into the control enclosure, in which case such leakage is to be
released to the exterior of the control before entering any opening provided for conduit
connection, or
b) the bellows, Bourdon tube, diaphragm or similar element is made of stainless steel or
material of equivalent resistance to corrosion designated material class B, if leakage from
a ruptured element will be to the exterior of the control enclosure only.
NOTE 1 Suitable class A and B materials are shown in Annex BB.
NOTE 2 1 mm /s = 1 centistoke.
Additional subclauses:
9.101 Construction requirements relating to operating mechanism
9.101.1 If screws and nuts serve to attach operating parts to movable members, they shall be
swaged or otherwise locked.
9.101.2 The operating mechanism of a manually operated switch shall not subject parts to
damage.
9.101.3 Operating parts shall be separated by barriers or by their physical location from
conductors to be connected to the control to avoid interference with the movement of such parts
by the conductors.
Compliance with 9.101.1 to 9.101.3 inclusive is checked by inspection.
9.102 A pressure cut-out shall not reset or be resettable manually or otherwise at a value
above the maximum or below the minimum operating pressure, whichever is declared.
9.103 A pressure cut-out with a manually operated reset device shall be trip-free.
Compliance with 9.102 and 9.103 is checked by inspection.
10 Threaded parts and connections
This clause of Part 1 is applicable.
11 Creepage distances, clearances and distances through solid insulation
This clause of Part 1 is applicable.
12 Components
This clause of Part 1 is applicable.
13 Fault assessment on electronic circuits
This clause of Part 1 is applicable except as follows:
13.1 Fault assessment for inherent safety
13.1.3 Component fault assessment
13.1.3.8 Compliance criteria
Item c) is not applicable.
14 Moisture and dust resistance
This clause of Part 1 is applicable except as follows:
14.1 Protection against ingress of water and dust
14.1.1 Addition:
The tests in this subclause are not intended to determine the suitability of the seal between the
control and the equipment.
15 Electric strength and insulation resistance
This clause of Part 1 is applicable.
16 Heating
This clause of Part 1 is applicable.
17 Manufacturing deviation and drift
This clause of Part 1 is applicable.
18 Environmental stress
This clause of Part 1 is applicable.
19 Endurance
This clause of Part 1 is applicable except as follows:
19.1 General requirements
19.1.5 Compliance criteria
Replacement:
Compliance with 19.1.2 and 19.1.3 is checked by the tests of 19.15.
19.1.6 Test sequence and conditions
19.1.6.2 Addition:
The tests of Clause 19 shall be conducted at the declared maximum working pressure and
operating differential as declared in Table 1, requirement 102 and 103.
19.15 Test for particular purpose controls
Additional subclauses:
19.15.101 Pressure operating controls
Subclauses 19.1 to 19.5 inclusive are applicable.
Subclause 19.6 is not applicable.
Subclauses 19.7 and 19.8 are applicable.
Subclause 19.9 is applicable, but only to slow-make, slow-break automatic actions.
Subclauses 19.10 to 19.13 inclusive are applicable but only to those pressure operating
controls which have a manual action (including an actuating means providing setting by the
user).
Subclause 19.14 is applicable.
19.15.102 Pressure limiter
Subclauses 19.1 to 19.5 inclusive are applicable.
Subclause 19.6 is not applicable.
Subclauses 19.7 and 19.8 are applicable except that, where necessary, the reset operation, if
required, is obtained by actuation. This actuation shall be as specified in 19.4 for accelerated
speed, as soon as permitted by the mechanism, or as declared by the manufacturer in Table 1,
requirement 31.
Subclause 19.9 is applicable, but only to slow-make, slow-break automatic actions, the same
conditions for manual reset for 19.7 and 19.8 being used.
Subclauses 19.10 to 19.13 inclusive are applicable but only to those pressure limiters which
have a manual action (including an actuating means providing setting by the user).
Subclauses 19.10 to 19.13 inclusive are not applicable to the normal reset manual action,
which is tested during the automatic test of 19.7 to 19.9 inclusive. If the pressure limiter has
other manual actions which are not tested during the automatic test, then these subclauses
are applicable.
Subclause 19.14 is applicable.
20 Mechanical strength
This clause of Part 1 is applicable except as follows:
Additional subclauses:
20.101 Medium leakage
Parts of pressure limiters or pressure cut-outs which are subjected to pressure of a fluid to
be supervised shall not leak externally at a rate in excess of 200 cm /h, when tested with air or
nitrogen at a pressure of 1,5 times the maximum working pressure of the control.
To determine compliance, the control shall be connected to a system capable of supplying
clean air or nitrogen at the specified test pressure. Any by-pass or other openings not essential
to the operation of the control during the test shall be sealed. Air or nitrogen shall be admitted
and maintained at the specified test pressure. In the case of a diaphragm element, which, in
normal usage, is subjected to pressure on both sides of the diaphragm, the test pressure shall
be applied to both sides of the diaphragm slowly and without shock to avoid stressing the
diaphragm excessively.
Leakage shall be observed by an apparatus capable of indicating accurately a flow rate of
200 cm /h for the test fluid employed. A control with a maximum working pressure of 35 kPa
or more can be considered as conforming to the above if, when the fluid-containing parts of the
control are submerged in water to a depth of approximately 25 mm while under the test
pressure, no bubble indicating leakage is observed within 10 s after the parts are submerged.
To conform to 9.11.105, a control shall not allow leakage under conditions of ruptured
diaphragm or bellows from an unthreaded vent opening or around pins, stems or linkages
passing through the housing in excess of the following rate, when the control is tested to its
maximum working pressure:
a) 0,03 m /h of a 0,64 specific gravity gas for a control for use only with fuel gases having
specific gravity less than 1,0;
NOTE 1 In the countries members of CENELEC, the leakage rate is 70 l/h.
b) 0,014 m /h of a 1,53 specific gravity gas for a control for use with liquified petroleum gases;
NOTE 2 In the countries members of CENELEC, the leakage rate is 70 l/h.
c) 0,001 m /h of water for a control for use with flammable liquids such as gasoline, kerosene
and fuel oils up to 1,2 mm /s;
3 2
d) 0,002 m /h of the lightest grade fuel oil heavier than 1,2 mm /s for which a control shall be
used.
20.102 Strength of parts (hydrostatic)
20.102.1 A pressure sensing control employing a Bourdon tube, a flexible metal bellows, a
diaphragm or the like rated 2 000 kPa or more, which is not contained within an enclosure, shall
withstand for 1 min without bursting a hydraulic pressure equal to four times the maximum
working pressure of the control.
The control under test shall be filled with water to exclude air and is connected to a hydraulic
pump. The pressure shall be raised gradually to the required test pressure.
Leakage at a gasket or fitting during this test is permitted provided the leakage does not occur
below 50 % of the required test pressure and the test can be continued to four times maximum
working pressure.
20.102.2 A pressure sensing control employing a Bourdon tube, a flexible metal bellows, a
diaphragm or the like that is contained within an enclosure shall comply with 20.102.1 or shall
– withstand for 1 min without visible leakage a hydraulic pressure of two times the maximum
working pressure, and
– withstand for 1 min a hydraulic pressure equal to four times the maximum working pressure
or, if this pressure cannot be reached without damage to the equipment, at least three times
maximum working pressure. Also, it shall be demonstrated that the enclosure can either
relieve pressure equal to four times maximum working pressure without rupturing in a
manner likely to endanger persons or surroundings, or that it can withstand the test
pressure.
The test is conducted as in 20.102.1.
20.102.3 A pressure limiter or pressure cut-out shall be capable of withstanding for 1 min
without bursting a hydraulic pressure equal to four times the maximum working pressure.
The control under test shall be filled with water to exclude air and connected to a hydraulic
pump. The pressure shall be raised gradually to the required test pressure.
21 Resistance to heat, fire and tracking
This clause of Part 1 is applicable.
22 Resistance to corrosion
This clause of Part 1 is applicable.
23 Electromagnetic compatibility (EMC) requirements - Emission
This clause of Part 1 is applicable.
24 Normal operation
This clause of Part 1 is applicable.
25 Electromagnetic compatibility (EMC) requirements - Immunity
This clause of Part 1 is applicable.
26 Abnormal operation tests
This clause of Part 1 is applicable.
Annex H
(normative)
Requirements related to functional safety
This annex of Part 1 is applicable except as follows:
H.3 Terms and definitions
H.3.21.2 Addition:
Note 101 to entry: In general, pressure cut-outs perform class B or C control functions.
H.3.21.3 Addition:
Note 101 to entry: In general, pressure cut-outs used on closed water heater systems perform class C control
functions.
H.5 Information
Table H.1 – Additional items to Table 1
Additional items:
Information Clause or Method
subclause
H.101 The output condition of pressure cut-outs, Type 2 operating controls and H.25.1.103,
H.25.1.104, X
Type 2 limiters after operation
H.25.1.105
H.102 Frequency of the defined state test function H.13.2.2.2,
H.13.2.3.2, X
H.13.2.3.3
H.103 The control is for permanent operation or non-permanent operation 3.3.102
3.3.103,
X
H.13.2.2.2,
H.13.2.3.2
Additional footnote:
For example, conducting or non-conducting, as applicable.

H.13 Fault assessment on electronic circuits
H.13.2 Fault assessment to ensure functional safety
H.13.2.2 Class B control function
H.13.2.2.2 First fault
Modification:
Replace item b) as follows:
b) the control shall react within the fault reaction time (see Table H.1, requirement H.11) by
proceeding to the defined state provided that a subsequent restart under the same fault
conditions results in the system returning to the same defined state condition;
Replace item c) as follows, adding the new Note:
c) for systems with non-permanent operation according to Table H.1 requirement H.103, the
control shall continue to operate as intended, the fault shall be detected during the next
start-up sequence. The compliance criteria shall be a) or b).
NOTE 101 Requirements for systems with permanent operation are under consideration.
Replace item d) as follows:
d) the control shall continue to operate as intended.
Replace the last two paragraphs with the following:
The fault reaction time shall be declared by the manufacturer (see Table H.1,
requirement H.11).
For permanent operation as declared by the manufacturer (see Table H.1, requirement
H.103), item c) is under consideration.
For a control function, where a mechanical actuator is part of a circuit that characterizes the
defined state, a test up to, but not including, the switching contacts is sufficient. If the test of
the defined state fails, the control shall initiate the safety shut-down. Frequency of test is as
declared by the manufacturer (see Table H.1, requirement H.102). Internal faults of the
components of the checking circuits are not considered.
H.13.2.3 Class C control function
H.13.2.3.2 First fault
Modification:
Replace item b) as follows:
b) the control reacting within the fault reaction time (see Table H.1, requirement H.11) by
proceeding to defined state provided that subsequent restart under the same fault
condition results in the system returning to the defined state condition;
Replace item c) follows, adding the new Note:
c) for systems with non-permanent operation, according to Table H.1, requirement H.103,
the control shall continue to operate as intended, the fault shall be detected during the next
start-up sequence. The compliance criteria shall be a) or b).
NOTE Requirements for systems with permanent operation are under consideration.
Replace item d) as follows:
d) The control shall continue to operate as intended.
Replace the last sentence with the following:
The fault reaction time shall be declared by the manufacturer (see Table H.1,
requirement H.11).
For permanent operation as declared by the manufacturer (see Table H.1, requirement
H.103), item c) is under consideration.
For a control function, where a mechanical actuator is part of a circuit that characterizes the
defined state, a test up to, but not including, the switching contacts is sufficient. If the test of
the defined state fails, the control shall initiate the safety shut-down. Frequency of test is as
declared by the manufacturer (see Table H.1, requirement H.102). Internal faults of the
components of the checking circuits are not considered.
H.13.2.3.3 Second fault
Modification:
Replace second sentence and items a) and b) with the following:
During assessment, for systems with non-permanent operation, the second fault shall only
be considered to occur when a start-up sequence has been performed after the first fault. For
systems with permanent operation, the second fault occurs 24 h after the first fault.
Replace the last two sentences with the following:
The fault reaction time, as well as the applicability of item c) of H.13.2.3.2, shall be as declared
by the manufacturer.
For a control function, where a mechanical actuator is part of a circuit that characterizes the
defined state, a test up to, but not including, the switching contacts is sufficient. If the test of
the defined state fails, the control shall initiate the safety shut-down. Frequency of test is as
declared by the manufacturer (see Table H.1, requirement H.102). Internal faults of the
components of the checking circuits are not considered.
H.13.2.4 Faults during defined state
Replacement:
H.13.2.4 is not applicable.
H.17 Manufacturing deviation and drift
H.17.4 Replacement:
The operating pressure and operating differential shall be as declared in Table 1, requirements
42 and 102. The allowable deviation and drift shall not be applied for the purpose
...


IEC 60730-2-6 ®
Edition 4.0 2025-08
INTERNATIONAL
STANDARD
EXTENDED VERSION
This full version of IEC 60730-2-6:2025 includes the content of the references made to
IEC 60730-1:2022
Automatic electrical controls -
Part 2-6: Particular requirements for automatic electrical pressure sensing
controls including mechanical requirements
ICS 97.120 ISBN 978-2-8327-0661-9
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright
or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local
IEC member National Committee for further information.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the
The advanced search enables to find IEC publications by a publications previews, graphical symbols and the glossary.
variety of criteria (reference number, text, technical With a subscription you will always have access to up to date
committee, …). It also gives information on projects, content tailored to your needs.
replaced and withdrawn publications.
Electropedia - www.electropedia.org
The world's leading online dictionary on electrotechnology,
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English
details all new publications released. Available online and and French, with equivalent terms in 25 additional languages.
once a month by email. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer
Service Centre: sales@iec.ch.
CONTENTS
FOREWORD . 9
1 Scope . 12
2 Normative references . 13
3 Terms and definitions . 17
3.1 Definitions relating to ratings, voltages, currents, frequencies, and wattages . 17
3.2 Definitions of types of control according to purpose . 20
3.3 Definitions relating to the function of controls . 22
3.4 Definitions relating to disconnection and interruption . 26
3.5 Definitions of types of control according to construction . 27
3.6 Definitions of type of automatic action of a control . 28
3.7 Definitions relating to protection against electric shock and type of insulation . 28
3.8 Definitions relating to component parts of controls . 32
3.9 Definitions of types of terminals and terminations of controls . 34
3.10 Definitions relating to the connections to controls . 36
3.11 Definitions relating to the performance of type 2 actions . 37
3.12 Definitions relating to the requirements for creepage distances and

clearances . 37
3.13 Miscellaneous definitions . 38
3.14 Definitions relating to manufacturer and user . 40
3.15 Definitions pertaining to thermistors . 40
3.16 Definitions relating to the structure of controls using software . 40
3.17 Definitions relating to error avoidance in controls using software . 40
3.18 Definitions relating to fault/error control techniques for controls using
software . 40
3.19 Definitions relating to memory tests for controls using software . 40
3.20 Definitions of software terminology – General . 40
3.21 Definitions relating to classes of control functions . 40
3.22 Definitions relating to functional safety . 40
3.23 Definitions related to access to data exchange . 40
3.24 Definitions related to EMC performance . 41
4 General . 43
4.1 General structure of the document . 43
4.2 General requirements . 44
4.3 General notes on tests . 44
5 Required technical information . 48
5.1 General requirements . 48
5.2 Methods of providing technical information . 48
5.3 Class II symbol . 56
5.4 Additional requirements for marking . 56
5.5 Warning or cautionary markings . 58
6 Protection against electric shock . 58
6.1 General requirements . 58
6.2 Actuating members and actuating means . 60
6.3 Capacitors . 61
6.4 Covers and uninsulated live or hazardous parts . 61
6.5 Battery operated controls provided with a user accessible mains supply input

connector . 61
7 Provision for protective earthing . 62
7.1 Class 0I and Class I controls. 62
7.2 Class II and class III controls . 62
7.3 Adequacy of earth connections . 62
7.4 Corrosion resistance . 63
7.5 Other requirements . 64
7.6 Protective equipotential bonding . 64
8 Terminals and terminations. 64
8.1 Terminals and terminations for external copper conductors . 64
8.2 Terminals and terminations for internal conductors . 69
8.3 Terminals and terminations for integrated conductors . 71
9 Constructional requirements . 71
9.1 Materials . 71
9.2 Protection against electric shock . 71
9.3 Actuation and operation . 74
9.4 Actions . 77
9.5 Openings in enclosures . 80
9.6 Mounting of controls . 80
9.7 Attachment of cords . 81
9.8 Size of cords – non-detachable . 82
9.9 Inlet openings . 83
9.10 Equipment inlets and socket-outlets . 83
9.11 Requirements during mounting, use, maintenance and servicing . 84
9.12 Controls using software . 87
9.13 Protective controls and components of protective control systems . 90
9.101 Construction requirements relating to operating mechanism . 92
9.102 A pressure cut-out shall not reset or be resettable manually or otherwise at a
value above the maximum or below the minimum operating pressure,
whichever is declared. . 93
9.103 A pressure cut-out with a manually operated reset device shall be trip-free. . 93
10 Threaded parts and connections . 93
10.1 Threaded parts moved during mounting or servicing . 93
10.2 Current-carrying connections and connections providing protective earthing
continuity . 95
11 Creepage distances, clearances and distances through solid insulation . 96
11.1 General . 96
11.2 Clearances . 97
11.3 Creepage distances . 101
11.4 Solid insulation . 105
12 Components . 106
12.1 Transformers . 106
12.2 Switch mode power supplies and converters . 106
12.3 Capacitors . 107
12.4 Fuses . 107
12.5 Varistors . 107
12.6 Thermistors. 107
12.7 Relays . 108
12.8 Other components . 108
13 Fault assessment on electronic circuits . 108
13.1 Fault assessment for inherent safety . 108
13.2 Fault assessment to ensure functional safety . 114
14 Moisture and dust resistance . 114
14.1 Protection against ingress of water and dust . 114
14.2 Protection against humid conditions . 115
14.3 Touch current test for in-line cord controls and free-standing controls . 116
15 Electric strength and insulation resistance . 117
15.1 Insulation resistance . 117
15.2 Electric strength . 117
15.3 Additional tests for in-line cord and free-standing controls . 119
16 Heating . 120
17 Manufacturing deviation and drift . 124
18 Environmental stress . 124
18.1 Transportation and storage . 124
18.2 Environmental stress of temperature . 124
19 Endurance . 125
19.1 General requirements . 125
19.2 Electrical conditions for the tests . 126
19.3 Thermal conditions for the tests . 132
19.4 Manual and mechanical conditions for the tests . 132
19.5 Dielectric strength requirements. 133
19.6 Ageing test . 133
19.7 Overvoltage test or overload test in all countries using an overload test of
automatic action at accelerated rate . 133
19.8 Test of automatic action at accelerated rate . 134
19.9 Test of automatic action at slow rate . 134
19.10 Overvoltage test or overload test in all countries that use the overload test of
manual action at accelerated speed . 135
19.11 Test of manual action at slow speed . 135
19.12 Test of manual action at high speed which has multiple poles, and where
polarity reversal occurs during the action . 135
19.13 Test of manual action at accelerated speed . 135
19.14 Evaluation of compliance . 136
19.15 Test for particular purpose controls . 136
20 Mechanical strength . 137
20.1 General requirements . 137
20.2 Impact resistance . 138
20.3 Free-standing controls . 138
20.4 In-line cord controls . 139
20.5 Pull-cord actuated controls . 139
20.6 Foot actuated controls . 139
20.7 Actuating member and actuating means . 140
20.8 Flexing – test . 140
20.9 Cord anchorages – test . 141
20.101 Medium leakage . 141
20.102 Strength of parts (hydrostatic) . 142
21 Resistance to heat, fire and tracking . 143
21.1 General requirements . 143
21.2 Integrated, incorporated and in-line cord controls. 143
21.3 Independently mounted, free-standing controls . 144
22 Resistance to corrosion . 145
22.1 Resistance to rusting . 145
23 Electromagnetic compatibility (EMC) requirements – Emission . 145
23.1 General requirement . 145
23.2 High frequency emission . 145
23.3 Low frequency emission . 149
24 Normal operation . 149
25 Electromagnetic compatibility (EMC) requirements – Immunity . 149
25.1 General . 149
25.2 EMC test plan and report . 150
25.3 Immunity requirements . 152
25.4 Performance criteria . 155
25.5 Surge immunity test . 156
25.6 Electrical fast transient immunity test . 156
25.7 Radio-frequency electromagnetic field immunity . 157
25.8 Electrostatic discharge . 157
25.9 Immunity to power-frequency magnetic fields . 157
25.10 Test of the influence of voltage dips and voltage interruption in the power
supply network . 157
26 Abnormal operation tests . 158
26.1 Abnormal temperature test . 158
26.2 Overload tests . 159
26.3 Battery short-circuit test . 160
Annex A (normative) Indelibility of markings . 177
Annex B (normative) Measurement of creepage distances and clearances in air . 179
Annex C (informative) Nominal voltages of supply systems for different modes of
overvoltage control . 183
Annex D (normative) Overvoltage categories . 185
Annex E (informative) Typical usage of controls and related overvoltage categories . 186
Annex F (normative) Pollution degrees . 187
F.1 Pollution . 187
F.2 Degrees of pollution in the micro-environment . 187
Annex G (normative) Resistance to heat, fire and tracking tests . 188
G.1 Glow-wire test . 188
G.2 Proof tracking test . 188
G.3 Ball pressure test . 188
Annex H (normative) Requirements related to functional safety . 190
H.3 Terms and definitions. 190
H.5 Information . 201
H.9 Constructional requirements . 203
H.13 Fault assessment on electronic circuits . 219
H.17 Manufacturing deviation and drift . 223
H.19 Endurance . 225
H.25 Electromagnetic compatibility (EMC) requirements – Immunity. 226
Annex I (normative) Requirements for certain types of DC supplied controls . 244
I.1 Scope . 244
Annex J (normative) Requirements for thermistor elements and controls using
thermistors. 246
J.1 Scope . 246
Annex K (normative) Circuit for measuring touch current . 263
Annex L (normative) Printed circuit board coating performance test . 264
Annex M (normative) Printed circuit board protection . 266
Annex N (informative) Explanatory notes for surge immunity test . 269
N.1 Different source impedances . 269
N.2 Application of the tests. 269
N.3 Installation classification . 270
Annex O (informative) Guidance for applying Clause 11 . 273
Annex P (normative) Requirements for SELV and PELV . 276
P.1 Overview of the requirements for SELV and PELV . 276
P.2 Protection against electric shock by SELV system or PELV system . 276
P.3 Protective measures for SELV system and PELV system . 277
Annex Q (informative) Regional differences relevant for the member countries of
Cenelec . 279
Annex R (informative) National differences relevant in the United States of America . 283
R.2 Normative references . 283
Annex S (informative) National differences relevant in Japan . 284
S.2 Normative references . 284
Annex T (informative) National differences relevant in Canada . 285
T.2 Normative references . 285
Annex AA (normative) Number of cycles . 286
AA.1 Number of cycles for independently mounted controls . 286
AA.2 Cycling rate for independently mounted controls . 286
Annex BB (informative) Stainless steel for bellows, bourdon tubes or similar elements . 287
Bibliography . 290

Figure 1 – Example of ports . 41
Figure 2 – Structure of the document with respect to inherent safety and functional
safety . 44
Figure 3 – Example of an electronic circuit with low power points . 109
Figure 4 – Test pin probe 13 of IEC 61032:1997 . 160
Figure 5 – Test finger probe B of IEC 61032:1997 . 161
Figure 6 – Test fingernail . 162
Figure 7 – Impact test for free-standing controls . 163
Figure 8 – Tumbling barrel . 163
Figure 9 – Apparatus for testing durability of markings on rating labels . 164
Figure 10 – Apparatus for flexing test . 164
Figure 11 – Screw terminals and stud terminals . 165
Figure 12 – Pillar terminals . 166
Figure 13 – Mantle terminals . 167
Figure 14 – Saddle and lug terminals . 168
Figure 15 – Tabs. 169
Figure 16 – Tabs for non-reversible connectors . 170
Figure 17 – Receptacles . 171
Figure 18 – Measurement of creepage distance and clearance . 172
Figure 19 – Diagram for touch current measurement at operating temperature for
single-phase connection of class II controls . 173
Figure 20 – Diagram for touch current measurement at operating temperature for
single-phase connection of controls other than class II . 173
Figure 21 – Diagram for touch current measurement at operating temperature for
three-phase connection of class II controls . 174
Figure 22 – Diagram for touch current measurement at operating temperature for
three-phase connection of controls other than class II . 175
Figure 23 – Diagram for touch current measurement at operating temperature for
single-phase connection of controls to three-wire, ground neutral supply other than
class II . 175
Figure 24 – Diagram for touch current measurement at operating temperature for
two‑phase connection of controls to three-wire, ground neutral supply other
than class II . 176
Figure B.1 – Narrow groove . 180
Figure B.2 – Wide groove . 180
Figure B.3 – V-shaped groove . 180
Figure B.4 – Rib . 180
Figure B.5 – Uncemented joint with narrow groove . 181
Figure B.6 – Uncemented joint with wide groove . 181
Figure B.7 – Uncemented joint with narrow and wide grooves . 181
Figure B.8 – Diverging side walls . 182
Figure B.9 – Narrow recess . 182
Figure B.10 – Wide recess . 182
Figure B.11 – Conductive floating part . 182
Figure H.1 – V-Model for the software life cycle . 211
Figure H.2 – Voltage variation test . 230
Figure J.1 – Generic test circuit for inrush-current limiting thermistor endurance test . 262
Figure K.1 – Circuit for measuring touch currents . 263
Figure L.1 – Test sample . 265
Figure M.1 – Example of type 1 protection . 267
Figure M.2 – Example of type 2 protection . 268
Figure N.1 – Example of surge protection by shielding in buildings with common earth
reference systems . 271
Figure N.2 – Example of secondary surge protection in buildings with separate
common earth reference systems . 272
Figure N.3 – Example of primary and secondary surge protection of indoor/outdoor
equipment . 272
Figure O.1 – Guidance flowchart for application of requirements of Clause 11 . 274

Table 1 – Required technical information and methods of providing these information . 51
Table 2 – Cross-sectional area of conductors . 65
Table 3 – Terminal conductors . 67
Table 4 – Conductor pull test values . 67
Table 5 – Nominal cross-sectional areas of conductors . 69
Table 6 – Axial force values for tab insertion and withdrawal . 70
Table 7 – Minimum cord conductor sizes . 82
Table 8 – Data exchange . 89
Table 9 – Threaded parts torque test values . 95
Table 10 – Rated impulse voltage for equipment energized directly from the supply
mains (from IEC 60664-1:2007, Table F.1) . 98
Table 11 – Clearances for insulation co-ordination (from IEC 60664-1:2007, Table F.2). 99
Table 12 – Minimum creepage distances for basic insulation . 103
Table 13 – Minimum creepage distances for functional insulation . 104
Table 14 – Electrical/electronic component fault modes . 110
Table 15 – Minimum insulation resistance . 117
Table 16 – Insulation or disconnection test voltages . 118
Table 17 – Maximum heating temperatures . 122
Table 18 – Electrical conditions for the overvoltage and endurance tests . 128
Table 19 – Electrical conditions for the overload tests of 19.7 and 19.10 . 130
Table 20 – Electrical conditions for the endurance tests of 19.8, 19.9, 19.11, 19.12 and
19.13 . 131
Table 21 – Pull-cord force test values . 139
Table 22 – Pull and torque values . 141
Table 23 – Emission limit for residential electromagnetic environment . 147
Table 24 – Emission limit for industrial electromagnetic environment . 148
Table 25 – The applicable EMC test in relation to the class of control function and type
of Action . 150
Table 26 – Immunity test requirements for residential electromagnetic environments . 152
Table 27 – Immunity test requirements for industrial electromagnetic environment . 154
Table 28 – Performance criteria . 156
Table 29 – Maximum winding temperature (for test of mechanical blocked output
conditions) . 159
Table B.1 – Value of X . 179
Table C.1 – Inherent control or equivalent protective control . 183
Table C.2 – Cases where protective control is necessary and control is provided by
surge arresters having a ratio of clamping voltage to rated voltage not smaller than
that specified by IEC 60099-1 . 184
Table E.1 – Typical usage. 186
Table H.1 – Additional items to Table 1 . 201
a
Table H.2 – Acceptable measures to address fault/errors . 204
Table H.3 – Examples of techniques/measures for semi-formal methods . 211
Table H.4 – Examples of techniques/measures for software architecture specification . 212
Table H.5 – Examples of techniques/measures for module design specification . 213
Table H.6 – Examples of techniques/measures for design and coding standards . 213
Table H.7 – Examples of techniques/measures for software module testing . 214
Table H.8 – Examples of techniques/measures for software integration testing . 215
Table H.9 – Examples of techniques/measures for software safety validation . 215
Table H.10 – Combinations of analytical measures during hardware development . 216
Table H.11 – Examples of defences against unauthorised access and transmission
failure modes . 218
Table H.12 – Applicable test levels in addition to Clause 25. 227
Table H.13 – Voltage dips, short interruptions and voltage variations . 229
Table H.14 – Test values for voltage variations . 230
Table H.15 – Test voltages for test level 2 (depending on the installation class
conditions) . 233
Table H.16 – Test level for electrical fast transient burst test . 235
Table H.17 – Test levels for conducted disturbances on mains and I/O lines . 237
Table H.18 – Test level for immunity to radiated electromagnetic fields . 238
Table H.19 – Increased test level for radiated immunity . 239
Table H.20 – Test level for supply frequency variations . 240
Table H.21 – Test level for continuous fields . 242
Table I.1 – Electrical transient conduction immunity in accordance with ISO 7637-2 . 244
Table I.2 – Electrical transient conduction immunity in accordance with ISO 7637-3 . 245
Table J.1 – Maximum current . 248
Table J.2 – Normal operating conditions . 249
Table J.3 – Samples for the test (clause reference) . 250
Table J.4 – Electrical and thermal ratings of a thermistor . 251
Table J.5 – Additional items to Table 1 . 252
Table J.6 – Sequence of calibration and conditioning tests for PTC thermistors . 254
Table J.7 – Classes for PTC sensing thermistors . 255
Table J.8 – Sequence of calibration and conditioning tests for NTC thermistors . 256
Table J.9 – Classes for NTC sensing thermistors . 256
Table J.10 – Number of cycles for endurance test . 260
Table J.11 – Ageing test temperature . 260
Table J.12 – Number of cycles for endurance test . 261
Table L.1 – Environmental cycling conditions . 264
Table M.1 – IEC 60664-3 test levels or conditions . 266
Table O.1 – Example A – Using Annex O guidance for applying Clause 11 . 275
Table O.2 – Example B – Using Annex O guidance for applying Clause 11 . 275
Table Q.1 – Additional aging parameters for windings .
...


IEC 60730-2-6 ®
Edition 4.0 2025-08
NORME
INTERNATIONALE
Dispositifs de commande électriques automatiques -
Partie 2-6: Exigences particulières pour les dispositifs de commande électriques
automatiques sensibles à la pression, y compris les exigences mécaniques
ICS 97.120  ISBN 978-2-8327-0598-8

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC -  IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications gratuitement tous les aperçus des publications, symboles
IEC en utilisant différents critères (numéro de référence, graphiques et le glossaire. Avec un abonnement, vous aurez
texte, comité d’études, …). Elle donne aussi des toujours accès à un contenu à jour adapté à vos besoins.
informations sur les projets et les publications remplacées
ou retirées. Electropedia - www.electropedia.org
Le premier dictionnaire d'électrotechnologie en ligne au
IEC Just Published - webstore.iec.ch/justpublished monde, avec plus de 22 500 articles terminologiques en
Restez informé sur les nouvelles publications IEC. Just anglais et en français, ainsi que les termes équivalents
dans 25 langues additionnelles. Egalement appelé
Published détaille les nouvelles publications parues.
Disponible en ligne et une fois par mois par email. Vocabulaire Electrotechnique International (IEV) en ligne.

Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-
nous: sales@iec.ch.
SOMMAIRE
AVANT-PROPOS . 3
1 Domaine d'application . 6
2 Références normatives . 7
3 Termes et définitions . 8
4 Généralités . 9
5 Informations techniques exigées . 10
6 Protection contre les chocs électriques . 10
7 Dispositions en vue de la mise à la terre de protection . 11
8 Bornes et connexions . 11
9 Exigences de construction . 11
10 Parties filetées et connexions . 13
11 Lignes de fuite, distances dans l'air et distances à travers l'isolation solide . 13
12 Éléments constituants . 13
13 Évaluation des pannes sur les circuits électroniques . 13
14 Résistance à l'humidité et à la poussière . 13
15 Résistance d'isolement et rigidité diélectrique . 13
16 Échauffements . 14
17 Tolérances de fabrication et dérive . 14
18 Contraintes climatiques . 14
19 Endurance . 14
20 Résistance mécanique . 15
21 Résistance à la chaleur, au feu et aux courants de cheminement . 17
22 Résistance à la corrosion . 17
23 Exigences de compatibilité électromagnétique (CEM) - Émission . 17
24 Fonctionnement normal . 17
25 Exigences de compatibilité électromagnétique (CEM) - Immunité . 17
26 Essais en fonctionnement anormal . 17
Annexe H (normative) Exigences relatives à la sécurité fonctionnelle . 18
Annexe Q (informative) Différences régionales pertinentes pour les pays membres du
CENELEC . 30
Annexe R (informative) Différences nationales applicables aux États-Unis . 31
Annexe S (informative) Différences nationales applicables au Japon . 32
Annexe T (informative) Différences nationales applicables au Canada . 33
Annexe AA (normative) Nombre de cycles . 34
Annexe BB (informative) Acier inoxydable pour soufflets, tubes de Bourdon ou éléments
similaires . 36
Bibliographie . 39

Tableau 1 – Informations techniques exigées et méthodes pour fournir ces informations . 10
Tableau H.1 – Points complémentaires au Tableau 1 . 18
Tableau AA.1 – Nombre de cycles pour les dispositifs de commande à montage
indépendant . 34
Tableau AA.2 – Vitesse de fonctionnement pour les dispositifs de commande à montage
indépendant . 35
Tableau BB.1 - Acier inoxydable pour soufflets, tubes de Bourdon ou éléments similaires . 36

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Dispositifs de commande électrique automatiques -
Partie 2-6: Exigences particulières pour les dispositifs de commande
électrique automatiques sensibles à la pression,
y compris les exigences mécaniques

AVANT-PROPOS
1) La Commission Électrotechnique Internationale (IEC) est une organisation mondiale de normalisation composée de
l'ensemble des comités électrotechniques nationaux (Comités nationaux de l'IEC). L'IEC a pour objet de favoriser la
coopération internationale pour toutes les questions de normalisation dans les domaines de l'électricité et de
l'électronique. À cet effet, l'IEC - entre autres activités - publie des Normes internationales, des Spécifications
techniques, des Rapports techniques, des Spécifications accessibles au public (PAS) et des Guides (ci-après
dénommés "Publication(s) de l'IEC"). Leur élaboration est confiée à des comités d'études, aux travaux desquels tout
Comité national intéressé par le sujet traité peut participer. Les organisations internationales, gouvernementales et
non gouvernementales, en liaison avec l'IEC, participent également aux travaux. L'IEC collabore étroitement avec
l'Organisation Internationale de Normalisation (ISO), selon des conditions fixées par accord entre les deux
organisations.
2) Les décisions ou accords officiels de l'IEC concernant les questions techniques représentent, dans la mesure du
possible, un accord international sur les sujets étudiés, étant donné que les Comités nationaux de l'IEC intéressés
sont représentés dans chaque comité d'études.
3) Les Publications de l'IEC se présentent sous la forme de recommandations internationales et sont agréées comme
telles par les Comités nationaux de l'IEC. Tous les efforts raisonnables sont entrepris afin que l'IEC s'assure de
l'exactitude du contenu technique de ses publications; l'IEC ne peut pas être tenue responsable de l'éventuelle
mauvaise utilisation ou interprétation qui en est faite par un quelconque utilisateur final.
4) Dans le but d'encourager l'uniformité internationale, les Comités nationaux de l'IEC s'engagent, dans toute la mesure
possible, à appliquer de façon transparente les Publications de l'IEC dans leurs publications nationales et régionales.
Toutes divergences entre toutes Publications de l'IEC et toutes publications nationales ou régionales
correspondantes doivent être indiquées en termes clairs dans ces dernières.
5) L'IEC elle-même ne fournit aucune attestation de conformité. Des organismes de certification indépendants
fournissent des services d'évaluation de conformité et, dans certains secteurs, accèdent aux marques de conformité
de l'IEC. L'IEC n'est responsable d'aucun des services effectués par les organismes de certification indépendants.
6) Tous les utilisateurs doivent s'assurer qu'ils sont en possession de la dernière édition de cette publication.
7) Aucune responsabilité ne doit être imputée à l'IEC, à ses administrateurs, employés, auxiliaires ou mandataires, y
compris ses experts particuliers et les membres de ses comités d'études et des Comités nationaux de l'IEC, pour
tout préjudice causé en cas de dommages corporels et matériels, ou de tout autre dommage de quelque nature que
ce soit, directe ou indirecte, ou pour supporter les coûts (y compris les frais de justice) et les dépenses découlant
de la publication ou de l'utilisation de cette Publication de l'IEC ou de toute autre Publication de l'IEC, ou au crédit
qui lui est accordé.
8) L'attention est attirée sur les références normatives citées dans cette publication. L'utilisation de publications
référencées est obligatoire pour une application correcte de la présente publication.
9) L'IEC attire l'attention sur le fait que la mise en application du présent document peut entraîner l'utilisation d'un ou
de plusieurs brevets. L'IEC ne prend pas position quant à la preuve, à la validité et à l'applicabilité de tout droit de
brevet revendiqué à cet égard. À la date de publication du présent document, l'IEC n'avait pas reçu notification qu'un
ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois, il y a lieu d'avertir les
responsables de la mise en application du présent document que des informations plus récentes sont susceptibles
de figurer dans la base de données de brevets, disponible à l'adresse https://patents.iec.ch. L'IEC ne saurait être
tenue pour responsable de ne pas avoir identifié de tels droits de brevets.
L'IEC 60730-2-6 a été établie par le comité d'études 72 de l'IEC: Commandes électriques
automatiques. Il s'agit d'une Norme internationale.
Cette quatrième édition annule et remplace la troisième édition parue en 2015 et
l'Amendement 1:2019. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition
précédente:
adoption de l'IEC 60730-1:2022 avec toutes les modifications majeures par rapport à
l'IEC 60730-1:2013, l'IEC 60730-1:2013/AMD1:2015 et l'IEC 60730-1:2013/AMD2:2020.
Le texte de cette Norme internationale est issu des documents suivants:
Projet Rapport de vote
72/1486/FDIS 72/1504/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l'élaboration de cette Norme internationale est l'anglais.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
www.iec.ch/members_experts/refdocs. Les principaux types de documents développés par l'IEC
sont décrits plus en détail sous www.iec.ch/standardsdev/publications.
Une liste de toutes les parties de la série IEC 60730, publiées sous le titre général: Dispositifs de
commande électrique automatiques, se trouve sur le site web de l'IEC.
La présente partie 2-6 est destinée à être utilisée conjointement avec l'IEC 60730-1. Elle a été
établie sur la base de la sixième édition de cette norme (2022). Les éditions futures de
l'IEC 60730-1 ou ses amendements pourront être pris en considération.
La présente Partie 2-6 complète ou modifie les articles correspondants de l'IEC 60730-1, de façon
à transformer cette publication en norme IEC: Exigences particulières pour les dispositifs de
commande électrique automatiques sensibles à la pression, y compris les exigences mécaniques.
Lorsque la présente Partie 2-6 spécifie "addition", "modification" ou "remplacement", il convient
d'adapter l'exigence, la modalité d'essai ou la note correspondante de la Partie 1 en conséquence.
Lorsqu'un paragraphe particulier de la Partie 1 n'est pas mentionné dans cette Partie 2, ce
paragraphe s'applique.
Pour les besoins d'élaboration d'une Norme internationale, il a été nécessaire d'examiner les
différentes exigences en s'appuyant sur l'expérience pratique acquise dans différentes régions du
monde et d'identifier les variantes nationales au niveau des réseaux d'alimentation électrique et
des règles d'installation.
L'attention du lecteur est attirée sur le fait que l'Annexe Q, l'Annexe R, l'Annexe S et l'Annexe T
donnent une liste de tous les articles qui traitent des différences de pratiques à caractère moins
permanent qui existent dans certains pays dans le domaine couvert par le présent document.
Dans cette publication:
Les caractères d'imprimerie suivants sont utilisés:
– exigences proprement dites: caractères romains;
– modalités d'essais: caractères italiques;
– notes: petits caractères romains;
– termes définis: caractères gras.
Les paragraphes, notes ou articles qui s'ajoutent à ceux de la Partie 1 sont numérotés à partir
de 101 et les annexes qui sont ajoutées sont désignées AA, BB, etc.
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de stabilité
indiquée sur le site web de l'IEC sous webstore.iec.ch dans les données relatives au document
recherché. À cette date, le document sera
– reconduit,
– supprimé, ou
– révisé.
1 Domaine d'application
L'article de la Partie 1 est remplacé par le texte suivant:
Le présent document s'applique aux dispositifs de commande électrique automatiques
sensibles à la pression
– utilisés dans, sur ou avec des matériels pour appareil domestique et usage analogue;
NOTE 1 Dans le présent document, le terme "matériel" signifie "appareil et matériel" et "dispositifs de commande"
signifie "dispositifs de commande sensibles à la pression".
– pour l'automatisation des bâtiments qui relèvent du domaine d'application de la série
ISO 16484 et de la série IEC 63044 (HBES/BACS);
EXEMPLE 1 Les dispositifs de commande électrique automatiques sensibles à la pression montés
indépendamment, les dispositifs de commande des systèmes de réseau intelligent et les dispositifs de commande des
systèmes d'automatisation des bâtiments qui relèvent du domaine d'application de l'ISO 16484-2.
– pour des matériels utilisés par le public, tels que les matériels destinés à être utilisés dans des
magasins, des bureaux, des hôpitaux, des fermes et des applications commerciales et
industrielles;
EXEMPLE 2 Les dispositifs de commande électrique automatiques sensibles à la pression pour les installations de
restauration, de chauffage et d'air conditionné.
– qui sont des dispositifs de commande électrique automatiques activés intelligents
sensibles à la pression;
EXEMPLE 3 Les dispositifs de commande électrique automatiques sensibles à la pression de réseau intelligent,
les interfaces distantes/dispositifs de commande de matériels utilisateurs d'énergie électrique, y compris les ordinateurs
ou les mobiles multifonctions.
– qui sont des dispositifs de commande à courant alternatif ou continu dont la tension assignée
ne dépasse pas 690 V en courant alternatif ou 600 V en courant continu;
– qui sont utilisés dans, sur ou avec des matériels qui utilisent l'électricité, le gaz, le pétrole, des
combustibles solides, l'énergie thermique solaire, etc. ou une combinaison de ces sources
d'énergie;
– qui sont utilisés dans le cadre d'un système de commande ou de dispositifs de commande qui
sont mécaniquement intégrés à des dispositifs de commande multifonctions comportant des
sorties non électriques;
– qui utilisent des thermistances CTN ou CTP ainsi qu'aux dispositifs à thermistances
discrètes, dont les exigences sont fournies à l'Annexe J;
– qui sont actionnés mécaniquement ou électriquement, qui commandent ou sont sensibles à la
pression ou au vide;
– ainsi qu'aux dispositifs de commande manuels qui sont électriquement et/ou mécaniquement
intégrés à des dispositifs de commande automatique.
NOTE 2 Les exigences relatives aux interrupteurs mécaniques à action manuelle qui ne font pas partie d'un dispositif
de commande automatique sont contenues dans l'IEC 61058-1-1.
Le présent document s'applique également aux différents dispositifs de commande sensibles à
la pression qui sont utilisés dans le cadre d'un système de commande ou aux dispositifs de
commande sensibles à la pression qui sont mécaniquement intégrés à des dispositifs de
commande multifonctions comportant des sorties non électriques.
Le présent document s'applique également aux dispositifs de commande sensibles à la pression
pour appareils qui relèvent du domaine d'application de l'IEC 60335-1.
Le présent document s'applique
– à la sécurité intrinsèque des dispositifs de commande sensibles à la pression; et
– à la sécurité fonctionnelle des dispositifs de commande sensibles à la pression et des
systèmes de sécurité;
– aux dispositifs de commande sensibles à la pression pour lesquels les performances (par
exemple, l'effet des phénomènes CEM) du produit peuvent compromettre la sécurité et les
performances globales du système commandé;
– aux valeurs de fonctionnement, aux temps de fonctionnement et aux séquences de
fonctionnement lorsque ces éléments interviennent dans la sécurité du matériel.
Le présent document spécifie les exigences relatives à la construction, au fonctionnement et aux
essais des dispositifs de commande électrique automatiques utilisés dans, sur ou avec du
matériel.
Le présent document
– ne s'applique pas aux dispositifs de commande sensibles à la pression destinés
exclusivement à des applications de processus industriels, sauf mention particulière dans la
partie 2 applicable ou la norme du matériel. Toutefois, le présent document peut être utilisé
pour évaluer les dispositifs de commande électrique automatiques destinés spécifiquement
aux applications industrielles lorsqu'il n'existe aucune norme de sécurité pertinente;
– ne prend pas en compte la valeur de réponse d'une action automatique d'un dispositif de
commande sensible à la pression, lorsque cette valeur de réponse dépend de la méthode de
montage du dispositif de commande dans le matériel. Lorsqu'une valeur de réponse est
importante du point de vue de la protection de l'utilisateur ou de l'environnement, la valeur
définie dans la norme de matériel pertinente ou déterminée par le fabricant s'applique;
– ne traite pas de l'intégrité du signal de sortie transmis aux dispositifs de réseau, comme
l'interopérabilité avec d'autres dispositifs, à moins qu'elle ait été évaluée comme partie
intégrante du système de commande.
Le présent document établit les exigences relatives aux caractéristiques électriques des
dispositifs de commande sensibles à la pression et aux caractéristiques mécaniques qui ont
une incidence sur leur fonctionnement prévu.
NOTE Le 20.101 relatif aux dispositifs de commande pour gaz et/ou fioul est à l'étude en attendant la revue ou la
révision de l'ISO 22967, l'ISO 22968 et l'ISO 23550, selon le cas.
En règle générale, ces dispositifs de commande sensibles à la pression sont intégrés ou
incorporés au matériel ou prévus pour être intégrés dans ou montés sur le matériel. Le présent
document couvre également ces dispositifs de commande lorsqu'ils sont montés de manière
indépendante. Les dispositifs de commande intercalés dans un câble souple ne sont pas
couverts par le présent document.
2 Références normatives
L'article de la Partie 1 s'applique.
3 Termes et définitions
L'article de la Partie 1 s'applique, avec les exceptions suivantes:
3.2 Définitions des différents types de dispositifs de commande en fonction de
l'application
Définitions supplémentaires:
3.2.101
limiteur de pression
dispositif de commande sensible à la pression destiné à maintenir une pression au-dessous ou
au-dessus d'une valeur prédéterminée dans les conditions de fonctionnement normal et pour
lequel un réglage par l'utilisateur peut être prévu
Note 1 à l'article: Un limiteur de pression peut être du type à réarmement automatique ou manuel. Il n'effectue pas
l'opération inverse pendant le cycle normal de fonctionnement du matériel.
3.2.102
dispositif de commande sensible à la pression
dispositif de commande sensible à la pression réglé à une valeur haute ou basse de la pression,
ou à deux valeurs, qui établit des limites entre lesquelles le matériel est normalement appelé à
fonctionner
3.2.103
coupe-circuit à pression
dispositif de commande sensible à la pression destiné à maintenir une pression au-dessous ou
au-dessus d'une valeur particulière dans les conditions de fonctionnement anormal du matériel et
pour lequel un réglage par l'utilisateur n'est pas prévu
Note 1 à l'article: Un coupe-circuit à pression peut être du type à réarmement automatique ou manuel.
Note 2 à l'article: Un coupe-circuit à pression assure une action de Type 2.
Note 3 à l'article: Un coupe-circuit à pression peut avoir une butée réglable destinée à être réglée par le fabricant
du dispositif de commande, le fabricant du matériel ou l'installateur.
3.3 Définitions concernant les fonctions des dispositifs de commande
Définitions supplémentaires:
3.3.101
agent de pression
agent utilisé pour transmettre la pression à l'élément sensible à la pression
Note 1 à l'article: Les agents de pression utilisés dans le présent document sont des gaz ou des liquides.
3.3.102
fonctionnement permanent
surveillance continue de la fonction de protection au cours du fonctionnement de l'appareil ou du
système pendant plus de 24 h
Note 1 à l'article: La durée de 24 h est considérée comme l'intervalle de temps type entre une première panne et une
seconde panne.
3.3.103
fonctionnement non permanent
surveillance continue de la fonction de protection au cours du fonctionnement de l'appareil ou du
système pendant moins de 24 h
Note 1 à l'article: La durée de 24 h est considérée comme l'intervalle de temps type entre une première panne et une
seconde panne.
3.8 Définitions concernant les éléments constituants des dispositifs de commande
Définition supplémentaire:
3.8.101
mise à l'air libre
ouverture du côté atmosphérique d'un diaphragme vers l'atmosphère, par laquelle l'air s'échappe
ou est admis lorsque le dispositif de commande est en fonctionnement
4 Généralités
L'article de la Partie 1 s'applique, avec les exceptions suivantes:
4.3 Généralités sur les essais
4.3.2 Conditions d'essai
4.3.2.7 Remplacement:
Les taux de variation de la pression déclarés dans le Tableau 1, exigence 31 et utilisés à
l'Article 19 (c'est-à-dire α , β , α , β ) doivent avoir des tolérances d'essai conformes aux valeurs
1 1 2 2
déclarées par le fabricant.
4.3.4 Instructions pour les essais
4.3.4.1 Selon les échantillons soumis
Paragraphe supplémentaire:
4.3.4.1.101 Les valeurs indiquées à l'Annexe AA s'appliquent aux essais de l'Article 19 pour les
dispositifs de commande sensibles à la pression à montage indépendant. Les valeurs relatives
aux dispositifs de commande intégrés et incorporés sont spécifiées dans la norme de matériel
appropriée.
5 Informations techniques exigées
5.2 Méthodes pour fournir les informations techniques
Le paragraphe de la Partie 1 s'applique, avec les exceptions suivantes:
Tableau 1 – Informations techniques exigées et méthodes pour fournir ces informations
Article ou
Informations Méthode
paragraphe
Remplacement:
19 Nombre de cycles de manœuvre (M) pour chaque action manuelle Annexe AA, X
19.10, 19.11
Les valeurs préférentielles sont: 100 000 cycles; 30 000 cycles;
j j j
10 000 cycles; 6 000 cycles; 3 000 cycles ; 300 cycles ; 30 cycles
NOTE Pour les dispositifs de commande qui comportent plusieurs actions
manuelles, une valeur différente peut être déclarée pour chaque action. Si un
dispositif de commande possède plusieurs positions "ARRÊT" prévues, un
cycle de manœuvre est considéré comme un mouvement d'une position
"ARRÊT" à la position "ARRÊT" suivante.
20 Nombre de cycles automatiques (A) pour chaque action automatique. Annexe AA, X
13.1.3.3,
Les valeurs préférentielles sont: 300 000 cycles; 200 000 cycles;
Tableau 14,
100 000 cycles; 30 000 cycles; 20 000 cycles; 10 000 cycles; 6 000 cycles;
19.7.6,
a a b bd c
3 000 cycles ; 1 000 cycles ; 300 cycles ; 30 cycles ; 1 cycle .
19.8.4
1) Ne s'applique pas aux thermostats et autres dispositifs à action cyclique
rapide.
2) S'applique uniquement au réarmement manuel.
3) S'applique uniquement aux actions qui exigent le remplacement d'un
élément après chaque fonctionnement.
4) Ne peut être réarmé qu'au cours de l'entretien par le fabricant.
NOTE Pour les dispositifs de commande qui comportent plusieurs actions
automatiques, une valeur différente peut être déclarée pour chaque action.
29 Non applicable
38 Non applicable
42 Pression (ou pressions) de service 3.3.11, 17,
H.17.4
52 Non applicable
Points supplémentaires:
101 Agent de pression 3.3.101,
9.3.101, X
20.101
102 Différentielle de fonctionnement 3.3.25,
H.17.4 D
H.17.6
103 Pression de travail maximale 3.3.28, 9,
D
19, 20
Ajout à la Note de bas de tableau h:
Pour les dispositifs de commande sensibles à la pression, les limites des grandeurs déclenchantes sont soit
spécifiées dans la norme d'appareil applicable, soit spécifiées par le fabricant de l'appareil, soit déclarées par
le fabricant du dispositif de commande sensible à la pression (voir 19.7 et 19.8).

6 Protection contre les chocs électriques
L'article de la Partie 1 s'applique.
7 Dispositions en vue de la mise à la terre de protection
L'article de la Partie 1 s'applique.
8 Bornes et connexions
L'article de la Partie 1 s'applique.
9 Exigences de construction
L'article de la Partie 1 s'applique, avec les exceptions suivantes:
9.4 Actions
Paragraphe supplémentaire:
9.4.101 Action de Type 2.N (pour les actions de détection, pas d'augmentation de la valeur
de fonctionnement en présence de fuites de l'élément sensible ou des pièces qui
relient l'élément sensible à la tête de commande)
Une action de Type 2.N doit être conçue de sorte qu'en cas de fuite dans l'élément sensible ou
dans toute autre partie entre l'élément sensible et la tête de commande, la coupure ou
l'interruption déclarée intervienne avant que la somme de la pression de service déclarée et de la
dérive soit dépassée.
La conformité est vérifiée par l'essai suivant:
La pression de service d'un dispositif de commande de Type 2.N doit être mesurée dans les
conditions de l'Article 17. Si le dispositif de commande comporte des moyens de réglage, il doit
être réglé sur la valeur la plus élevée.
Après ce mesurage, un trou est artificiellement réalisé dans l'élément sensible et le mesurage de
la pression de service est répété.
Aucune dérive positive n'est admise au-dessus de la valeur déclarée.
Une gaine ou un manchon peut être utilisé pour protéger l'élément sensible afin de se conformer
à l'Article 20.
NOTE L'essai peut être remplacé par des calculs théoriques du mode physique de fonctionnement.
9.11 Exigences pendant le montage, l'utilisation et les opérations de maintenance et
d'entretien
Paragraphes supplémentaires:
9.11.101 Les parties en contact avec un diaphragme doivent être exemptes d'aspérités
coupantes, de proéminences ou caractéristiques analogues qui usent ou rayent ce diaphragme.
La conformité est vérifiée par examen avant et après les essais de l'Article 19.
9.11.102 Un ressort de fonctionnement doit être maintenu et disposé de façon à empêcher son
abrasion, son pincement, son flambage ou toute entrave à son libre mouvement.
La conformité est vérifiée par examen avant et après les essais de l'Article 19.
9.11.103 Si la défaillance d'une partie quelconque du dispositif de commande peut entraîner une
fuite contraire à la sécurité de liquide dangereux, cette partie doit être constituée d'un matériau
ayant un point de fusion (température de solidification) supérieur ou égal à 510 °C et une
résistance à la traction supérieure ou égale à 68 MPa à 204 °C.
Ces parties ne doivent pas fléchir, se déformer, fondre, s'oxyder ou laisser fuir des liquides au
cours de l'un des essais spécifiés dans la présente norme.
La conformité est vérifiée par examen avant et après les essais de l'Article 19.
9.11.104 Toute partie comportant une gaine, un tube capillaire, un soufflet ou un diaphragme
doit résister à la corrosion atmosphérique et à la corrosion par le fluide pouvant généralement
entrer à son contact en service, si la défaillance de cette partie entraîne une fuite externe de
liquide combustible ou un dysfonctionnement du dispositif de commande.
NOTE Les alliages de laiton dont la teneur en cuivre est inférieure à 81 % et la teneur en zinc est supérieure à 9 % ne
sont pas considérés comme résistants aux effets corrosifs des hydrocarbures.
9.11.105 Un dispositif de commande dans lequel un diaphragme souple, un soufflet ou un
élément similaire constitue le seul joint d'étanchéité au liquide ou gaz inflammable doit avoir le
côté du diaphragme ou du soufflet exposé à l'atmosphère et être enfermé dans une enveloppe
conçue pour limiter les fuites externes de liquide en cas de déchirure du diaphragme ou du soufflet,
ou doit comporter des dispositifs pour le raccordement d'une mise à l'air libre ou d'un tube destiné
à être acheminé vers l'extérieur ou vers un autre endroit sûr.
9.11.106 Un dispositif de commande conçu pour surveiller la pression d'hydrocarbure de
2 2
viscosité comprise entre 1,00 mm /s et 600 mm /s ne doit pas se conformer au 20.101 et
au 20.102, sous réserve que trois échantillons du dispositif de commande ne présentent pas de
fuite au cours d'un essai d'endurance de 100 000 cycles et que, lorsqu'ils sont soumis à un essai
hydrostatique sous quatre fois la pression de travail maximale, après l'essai d'endurance, le
dispositif de commande respecte l'une des conditions suivantes:
a) le soufflet, tube de Bourdon, diaphragme ou élément similaire est réalisé en acier inoxydable
ou dans un matériau présentant une résistance à la corrosion équivalente et désigné matériau
de classe A, si la fuite due à l'élément brisé se produit dans l'enveloppe du dispositif de
commande, auquel cas cette fuite doit être acheminée à l'extérieur du dispositif de commande
avant de pouvoir pénétrer par tout orifice prévu pour raccorder une conduite, ou
b) le soufflet, tube de Bourdon, diaphragme ou élément similaire est réalisé en acier inoxydable
ou dans un matériau présentant une résistance à la corrosion équivalente et désigné matériau
de classe B, si la fuite due à l'élément brisé se produit exclusivement à l'extérieur de
l'enveloppe du dispositif de commande.
NOTE 1 L'Annexe BB indique les matériaux de classes A et B appropriés.
NOTE 2 1 mm /s = 1 centistoke.
Paragraphes supplémentaires:
9.101 Exigences de construction applicables aux mécanismes de fonctionnement
9.101.1 Les vis et écrous servant à fixer des parties en fonctionnement à des pièces mobiles
doivent être arrêtés au pointeau ou bloqués autrement.
9.101.2 Les parties d'un interrupteur à commande manuelle ne doivent pas être endommagées
par son mécanisme de fonctionnement.
9.101.3 Les parties en fonctionnement doivent être séparées, par des barrières ou par leur
emplacement, des conducteurs à raccorder au dispositif de commande pour leur éviter de
perturber le mouvement de ces parties.
La conformité aux 9.101.1 à 9.101.3 inclus est vérifiée par examen.
9.102 Un coupe-circuit à pression ne doit pas se réarmer ni être réarmable à la main ou d'une
autre manière, à une valeur supérieure à la pression de service maximale ou inférieure à la
pression de service minimale, si cette valeur est déclarée.
9.103 Un coupe-circuit à pression à dispositif de réarmement manuel doit être à
déclenchement libre.
La conformité aux 9.102 et 9.103 est vérifiée par examen.
10 Parties filetées et connexions
L'article de la Partie 1 s'applique.
11 Lignes de fuite, distances dans l'air et distances à travers l'isolation solide
L'article de la Partie 1 s'applique.
12 Éléments constituants
L'article de la Partie 1 s'applique.
13 Évaluation des pannes sur les circuits électroniques
L'article de la Partie 1 s'applique, avec les exceptions suivantes:
13.1 Évaluation des pannes pour la sécurité intrinsèque
13.1.3 Évaluation des pannes de composant
13.1.3.8 Critères de conformité
Le point c) ne s'applique pas.
14 Résistance à l'humidité et à la poussière
L'article de la Partie 1 s'applique, avec les exceptions suivantes:
14.1 Protection contre la pénétration de l'eau et de la poussière
14.1.1 Addition:
Les essais de ce paragraphe n'ont pas pour objet de déterminer l'étanchéité entre le dispositif de
commande et le matériel.
15 Résistance d'isolement et rigidité diélectrique
L'article de la Partie 1 s'applique.
16 Échauffements
L'article de la Partie 1 s'applique.
17 Tolérances de fabrication et dérive
L'article de la Partie 1 s'applique.
18 Contraintes climatiques
L'article de la Partie 1 s'applique.
19 Endurance
L'article de la Partie 1 s'applique, avec les exceptions suivantes:
19.1 Exigences générales
19.1.5 Critères de conformité
Remplacement:
La conformité au 19.1.2 et au 19.1.3 est vérifiée par les essais du 19.15.
19.1.6 Séquence et conditions d'essais
19.1.6.2 Addition:
Les essais de l'Article 19 doivent être effectués à la pression de travail maximale et la
différentielle de fonctionnement déclarées dans le Tableau 1, exigences 102 et 103.
19.15 Essai pour les dispositifs de commande à usages particuliers
Paragraphes supplémentaires:
19.15.101 Dispositifs de commande sensibles à la pression
Les 19.1 à 19.5 inclus s'appliquent.
Le 19.6 ne s'applique pas.
Les 19.7 et 19.8 s'appliquent.
Le 19.9 s'applique, mais seulement pour les actions automatiques à ouverture et fermeture lentes.
Les 19.10 à 19.13 inclus s'appliquent uniquement aux dispositifs de commande sensibles à la
pression à action manuelle (y compris un organe de manœuvre permettant le réglage par
l'utilisateur).
Le 19.14 s'applique.
19.15.102 Limiteur de pression
Les 19.1 à 19.5 inclus s'appliquent.
Le 19.6 ne s'applique pas.
Les 19.7 et 19.8 s'appliquent, excepté lorsque l'opération de réarmement, si elle est exigée,
s'effectue par une manœuvre. Cette manœuvre doit correspondre à celle spécifiée au 19.4 pour
l'essai à grande vitesse, si le mécanisme le permet, ou celle déclarée par le fabricant dans le
Tableau 1, exigence 31.
Le 19.9 s'applique uniquement aux actions automatiques à ouverture et fermeture lentes, en
utilisant les mêmes conditions de réarmement manuel spécifiées pour les 19.7 et 19.8.
Les 19.10 à 19.13 inclus s'appliquent uniquement aux limiteurs de pression à action manuelle
(y compris un organe de manœuvre permettant le réglage par l'utilisateur).
Les 19.10 à 19.13 inclus ne s'appliquent pas aux actions manuelles de réarmement normales
vérifiées au cours de l'essai automatique des 19.7 à 19.9 inclus. Si le limiteur de pression
comporte d'autres actions manuelles qui ne sont pas vérifiées pendant l'essai automatique, alors
ces paragraphes s'appliquent.
Le 19.14 s'applique.
20 Résistance mécanique
L'article de la Partie 1 s'applique, avec les exceptions suivantes:
Paragraphes supplémentaires:
20.101 Fuites de l'agent de pression
Les parties des limiteurs de pression ou des coupe-circuit à pression qui sont soumises à la
pression d'un fluide à surveiller ne doivent pas présenter de fuites externes d'un débit supérieur à
200 cm /h, lors d'un essai à l'air ou à l'azote effectué à 1,5 fois la pression de travail maximale
du dispositif de commande.
Pour vérifier la conformité à ces dispositions, le dispositif de commande doit être relié à un
système capable de fournir de l'air ou de l'azote propre à la pression d'essai spécifiée. Chaque
dérivation ou orifice n'étant pas essentiel au fonctionnement du dispositif de commande doit être
obturé au cours de l'essai. L'air ou l'azote doit être admis et maintenu à la pression d'essai
spécifiée. Dans le cas d'un élément de diaphragme qui, en usage normal, est soumis à la pression
des deux côtés du diaphragme, la pression d'essai doit être appliquée doucement et sans
impulsion de part et d'autre du diaphragme pour éviter d'exercer des contraintes excessives sur
le diaphragme.
Les fuites éventuelles doivent être observées au moyen d'un appareil capable d'indiquer avec
/h pour le fluide d'essai employé. Un dispositif de
exactitude un débit de fuite de 200 cm
commande dont la pression de travail maximale est supérieure ou égale à 35 kPa peut être
considéré comme conforme aux dispositions ci-dessus s'il n'apparaît aucune bulle témoignant
d'une fuite 10 s après avoir immergé sous environ 25 mm d'eau les parties du dispositif de
commande destinées à contenir le fluide et maintenues à la pression d'essai.
Pour être conforme au 9.11.105, lorsque le dispositif de commande est soumis à l'essai à sa
pression de travail maximale, il ne doit pas présenter de fuite dépassant les valeurs suivantes
de débit en cas de rupture du diaphragme ou du soufflet, par les orifices non filetés de mise à l'air
libre ou autour des goupilles, goujons ou tiges passant au travers de leur enveloppe:
a) 0,03 m /h d'un gaz de masse volumique 0,64 dans le cas d'un dispositif de commande prévu
pour être uniquement utilisé avec des fluides gazeux dont la masse volumique est inférieure à
1,0;
NOTE 1 Dans les pays membres du CENELEC, le débit de fuite est de 70 l/h.
b) 0,014 m /h d'un gaz de masse volumique 1,53 dans le cas d'un dispositif de commande prévu
pour être utilisé avec du gaz de pétrole liquéfié;
NOTE 2 Dans les pays membres du CENELEC, le débit de fuite est de 70 l/h.
c) 0,001 m /h d'eau dans le cas d'un dispositif de commande prévu pour être utilisé avec des
liquides inflammables comme l'essence, le kérosène ou les hydrocarbures de viscosité
inférieure ou égale à 1,2 mm /s;
3 2
d) 0,002 m /h de l'hydrocarbure le plus léger dont la viscosité est supérieure à 1,2 mm /s avec
lequel le dispositif de commande doit être utilisé.
20.102 Robustesse des parties (hydrostatique)
20.102.1 Un dispositif de commande sensible à la pression utilisant un tube de Bourdon, un
soufflet métallique souple, un diaphragme ou élément analogue de caractéristique assignée
supérieure ou égale à 2 000 kPa qui n'est pas placé à l'intérieur d'une enveloppe doit supporter
pendant 1 min, sans éclater, une pression hydraulique égale à quatre fois la pression de travail
maximale de ce dispositif de commande.
Le dispositif de commande en essai doit être rempli d'eau pour chasser l'air et est raccordé à une
pompe hydraulique. La pression doit être progressivement augmentée jusqu'à la pression d'essai
exigée.
Les fuites aux joints ou aux raccordements sont admises au cours de l'essai à condition qu'elles
ne surviennent pas au-dessous de 50 % de la pression d'essai exigée. L'essai peut être poursuivi
jusqu'à quatre fois la valeur de la pression de travail maximale.
20.102.2 Un dispositif de commande sensible à la pression utilisant un tube de Bourdon, un
soufflet métallique souple, un diaphragme ou élément analogue placé à l'intérieur d'une enveloppe
doit se conformer aux dispositions du 20.102.1 ou doit
– supporter pendant 1 min sans fuite visible une pression hydraulique égale au double de la
pression de travail maximale, et
– supporter pendant 1 min une pression hydraulique égale à quatre fois la pression de travail
maximale ou, si cette pression ne peut être atteinte sans endommager le matériel, une pression
égale à au moins trois fois la pression de travail maximale. Il doit être également prouvé que
l'enveloppe peut soit annuler une pression égale à quatre fois la pression de travail maximale
sans se briser au risque de mettre en danger les personnes ou le milieu environnant, soit
supporter la pression d'essai.
L'essai est effectué comme cela est indiqué au 20.102.1.
20.102.3 Un limiteur de pression ou un coupe-circuit à pression doit pouvoir supporter
pendant 1 min, sans éclater, une pression hydraulique égale à quatre fois la pression de travail
maximale.
Le dispositif de commande en essai doit être rempli d'eau pour chasser l'air et être raccordé à une
pompe hydraulique. La pression doit être progressivement augmentée jusqu'à la pression d'essai
exigée.
----------
...


IEC 60730-2-6 ®
Edition 4.0 2025-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Automatic electrical controls -
Part 2-6: Particular requirements for automatic electrical pressure sensing
controls including mechanical requirements

Dispositifs de commande électriques automatiques -
Partie 2-6: Exigences particulières pour les dispositifs de commande électriques
automatiques sensibles à la pression, y compris les exigences mécaniques
ICS 97.120  ISBN 978-2-8327-0598-8

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either
IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright
or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local
IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the
The advanced search enables to find IEC publications by a publications previews, graphical symbols and the glossary.
variety of criteria (reference number, text, technical With a subscription you will always have access to up to date
committee, …). It also gives information on projects, content tailored to your needs.

replaced and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English
details all new publications released. Available online and and French, with equivalent terms in 25 additional languages.
once a month by email. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer
Service Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC -  IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications gratuitement tous les aperçus des publications, symboles
IEC en utilisant différents critères (numéro de référence, graphiques et le glossaire. Avec un abonnement, vous aurez
texte, comité d’études, …). Elle donne aussi des toujours accès à un contenu à jour adapté à vos besoins.
informations sur les projets et les publications remplacées
ou retirées. Electropedia - www.electropedia.org
Le premier dictionnaire d'électrotechnologie en ligne au
IEC Just Published - webstore.iec.ch/justpublished monde, avec plus de 22 500 articles terminologiques en
Restez informé sur les nouvelles publications IEC. Just anglais et en français, ainsi que les termes équivalents
Published détaille les nouvelles publications parues. dans 25 langues additionnelles. Egalement appelé
Disponible en ligne et une fois par mois par email. Vocabulaire Electrotechnique International (IEV) en ligne.

Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-
nous: sales@iec.ch.
CONTENTS
FOREWORD . 3
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 7
4 General . 8
5 Required technical information . 9
6 Protection against electric shock . 10
7 Provision for protective earthing . 10
8 Terminals and terminations. 10
9 Constructional requirements . 10
10 Threaded parts and connections . 12
11 Creepage distances, clearances and distances through solid insulation . 12
12 Components . 12
13 Fault assessment on electronic circuits . 12
14 Moisture and dust resistance . 12
15 Electric strength and insulation resistance . 12
16 Heating . 12
17 Manufacturing deviation and drift . 13
18 Environmental stress . 13
19 Endurance . 13
20 Mechanical strength . 14
21 Resistance to heat, fire and tracking . 15
22 Resistance to corrosion . 15
23 Electromagnetic compatibility (EMC) requirements - Emission . 15
24 Normal operation . 15
25 Electromagnetic compatibility (EMC) requirements - Immunity . 16
26 Abnormal operation tests . 16
Annex H (normative) Requirements related to functional safety . 17
Annex Q (informative) Regional differences relevant for the member countries of
Cenelec . 28
Annex R (informative) National differences relevant in the United States of America . 29
Annex S (informative) National differences relevant in Japan . 30
Annex T (informative) National differences relevant in Canada . 31
Annex AA (normative) Number of cycles . 32
Annex BB (informative) Stainless steel for bellows, bourdon tubes or similar elements . 33
Bibliography . 36

Table 1 – Required technical information and methods of providing these information . 9
Table H.1 – Additional items to Table 1 . 17
Table AA.1 – Number of cycles for independently mounted controls . 32
Table AA.2 – Cycling rate for independently mounted controls . 32
Table BB.1 - Stainless steel for bellows, bourdon tubes or similar elements. 33

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Automatic electrical controls -
Part 2-6: Particular requirements for automatic electrical pressure
sensing controls including mechanical requirements

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60730-2-6 has been prepared by IEC technical committee 72: Automatic electrical controls.
It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2015 and its
Amendment 1:2019. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
Adoption of IEC 60730-1:2022 with all of its significant changes to IEC 60730-1:2013,
IEC 60730-1:2013/AMD 1:2015 and IEC 60730-1:2013/AMD2:2020.
The text of this International Standard is based on the following documents:
Draft Report on voting
72/1486/FDIS 72/1504/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts of the IEC 60730 series, under the general title: Automatic electrical controls,
can be found on the IEC website.
This part 2-6 is intended to be used in conjunction with IEC 60730-1. It was established on the
basis of the sixth edition of that standard (2022). Consideration may be given to future editions
of, or amendments to, IEC 60730-1.
This part 2-6 supplements or modifies the corresponding clauses in IEC 60730-1, so as to
convert that publication into the IEC standard: Particular requirements for automatic electrical
pressure sensing controls including mechanical requirements.
Where this part 2-6 states "addition", "modification" or "replacement", the relevant requirement,
test specification or explanatory matter in part 1 should be adapted accordingly.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies.
In the development of a fully international standard, it has been necessary to take into
consideration the differing requirements resulting from practical experience in various parts of
the world and to recognize the variation in national electrical systems and wiring rules.
The reader's attention is drawn to the fact that Annex Q, Annex R, Annex S and Annex T list all
of the "in-some-country" clauses on differing practices of a less permanent nature relating to
the subject of this document.
In this publication:
The following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– explanatory matter: in smaller roman type;
– defined terms: bold type.
Subclauses, notes or items which are additional to those in Part 1 are numbered starting from
101, additional annexes are lettered AA, BB, etc.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
1 Scope
This clause of Part 1 is replaced by the following:
This document applies to automatic electrical pressure sensing controls
– for use in, on, or in association with equipment for household appliance and similar use;
NOTE 1 Throughout this document, the word "equipment" means "appliance and equipment" and "controls" means
"pressure sensing controls".
– for building automation within the scope of ISO 16484 series and IEC 63044 series
(HBES/BACS);
EXAMPLE 1 Independently mounted automatic electrical pressure sensing controls, controls in smart grid
systems and controls for building automation systems within the scope of ISO 16484-2.
– for equipment that is used by the public, such as equipment intended to be used in shops,
offices, hospitals, farms and commercial and industrial applications;
EXAMPLE 2 Automatic electrical pressure sensing controls for commercial catering, heating and air-conditioning
equipment.
– that are smart enabled automatic electrical pressure sensing controls;
EXAMPLE 3 Smart grid automatic electrical pressure sensing controls, remote interfaces/control of energy-
consuming equipment including computer or smart phone.
– that are AC or DC powered controls with a rated voltage not exceeding 690 V AC or 600 V
DC;
– used in, on, or in association with equipment that use electricity, gas, oil, solid fuel, solar
thermal energy, etc., or a combination thereof;
– utilized as part of a control system or controls which are mechanically integral with
multifunctional controls having non-electrical outputs;
– using NTC or PTC thermistors and to discrete thermistors, requirements for which are
contained in Annex J;
– that are mechanically or electrically operated, responsive to or controlling a pressure or
vacuum;
– as well as manual controls when such are electrically and/or mechanically integral with
automatic controls.
NOTE 2 Requirements for manually actuated mechanical switches not forming part of an automatic control are
contained in IEC 61058-1-1.
This document is also applicable to individual pressure sensing controls utilized as part of a
control system or pressure sensing controls which are mechanically integral with multi-
functional controls having non-electrical outputs.
This document is also applicable to pressure sensing controls for appliances within the scope
of IEC 60335-1.
This document applies to
– the inherent safety of pressure sensing controls, and
– functional safety of pressure sensing controls and safety related systems,
– pressure sensing controls where the performance (for example the effect of EMC
phenomena) of the product can impair the overall safety and performance of the controlled
system,
– the operating values, operating times, and operating sequences where such are associated
with equipment safety.
This document specifies the requirements for construction, operation and testing of automatic
electrical controls used in, on, or in association with an equipment.
This document does not
– apply to pressure sensing controls intended exclusively for industrial process applications
unless explicitly mentioned in the relevant part 2 or the equipment standard. However, this
document can be applied to evaluate automatic electrical controls intended specifically for
industrial applications in cases where no relevant safety standard exists;
– take into account the response value of an automatic action of a pressure sensing control,
if such a response value is dependent upon the method of mounting the control in the
equipment. Where a response value is of significant purpose for the protection of the user,
or surroundings, the value defined in the appropriate equipment standard or as determined
by the manufacturer will apply;
– address the integrity of the output signal to the network devices, such as interoperability
with other devices unless it has been evaluated as part of the control system.
This document contains requirements for electrical features of pressure sensing controls and
requirements for mechanical features that affect their intended operation.
NOTE Subclause 20.101, as it pertains to gas and/or oil controls, is under consideration pending review or revision
of ISO 22967, ISO 22968 and ISO 23550, if applicable.
In general, these pressure sensing controls are integrated or incorporated with the equipment
or are intended to be integrated in, or on the equipment. This document also covers these
controls when they are independently mounted. In-line cord controls are not covered by this
document.
2 Normative references
This clause of Part 1 is applicable.
3 Terms and definitions
This clause of Part 1 is applicable except as follows:
3.2 Definitions of types of control according to purpose
Additional definitions:
3.2.101
pressure limiter
pressure sensing control which is intended to keep a pressure below or above a predetermined
value during normal operating conditions and which can have provision for setting by the user
Note 1 to entry: A pressure limiter may be of the automatic or of the manual reset type. It does not make the
reverse operation during the normal duty cycle of the equipment.
3.2.102
pressure operating control
pressure sensing control set at a high or low pressure, or both, between which limits the
equipment is normally intended to operate
3.2.103
pressure cut-out
pressure sensing control intended to keep a pressure below or above one particular value
during abnormal operating conditions of the equipment and which has no provisions for setting
by the user
Note 1 to entry: A pressure cut-out may be of the automatic or of the manual reset type.
Note 2 to entry: A pressure cut-out will provide a Type 2 action.
Note 3 to entry: A pressure cut-out may have an adjustable stop intended to be set by the control manufacturer,
the equipment manufacturer or the installer.
3.3 Definitions relating to the function of controls
Additional definitions:
3.3.101
pressure medium
medium used to transmit the pressure to the pressure sensing element
Note 1 to entry: Pressure medium as used in this document refers to either gases or liquids.
3.3.102
permanent operation
continuous monitoring of the protective function during the operation of the appliance or
system for longer than 24 h
Note 1 to entry: 24 h is considered the typical time interval between a first and a second fault.
3.3.103
non-permanent operation
continuous monitoring of the protective function during the operation of the appliance or
system for less than 24 h
Note 1 to entry: 24 h is considered the typical time interval between a first and a second fault.
3.8 Definitions relating to component parts of controls
Additional definition:
3.8.101
vent
that opening from the atmospheric side of a diaphragm to the atmosphere through which air is
discharged or drawn in when the control is functioning
4 General
This clause of Part 1 is applicable except as follows:
4.3 General notes on tests
4.3.2 Conditions of test
4.3.2.7 Replacement:
The rates of pressure change declared in Table 1 requirement 31, and used in Clause 19 (i.e.
α , β , α , β ) shall have test tolerances as declared by the manufacturer.
1 1 2 2
4.3.4 Instructions for test
4.3.4.1 According to submission
Additional subclause:
4.3.4.1.101 The values in Annex AA apply for the testing of independently mounted pressure
sensing controls in Clause 19. Values for integrated and incorporated controls are specified
in the appropriate equipment standard.
5 Required technical information
5.2 Methods of providing technical information
This clause of Part 1 is applicable except as follows:
Table 1 – Required technical information and methods of providing these information
Clause or
Method
Information
subclause
Replacement:
X
19 Number of cycles of actuation (M) for each manual action Annex AA,
Preferred values are: 100 000 cycles; 30 000 cycles; 10 000 cycles; 19.10, 19.11
j j j
6 000 cycles; 3 000 cycles ; 300 cycles ; 30 cycles
NOTE For controls with more than one manual action, a different value can
be declared for each. If a control has more than one intended "OFF" position,
then a cycle of actuation is regarded as a movement from one "OFF" position
to the next "OFF" position.
X
20 Number of automatic cycles (A) for each automatic action. Annex AA,
Preferred values are: 300 000 cycles; 200 000 cycles; 100 000 cycles; 13.1.3.3,
a
Table 14,
30 000 cycles; 20 000 cycles; 10 000 cycles; 6 000 cycles; 3 000 cycles ;
a b bd c
19.7.6,
1 000 cycles ; 300 cycles ; 30 cycles ; 1 cycle .
19.8.4
1) Not applicable to thermostats or to other fast cycling actions.
2) Applicable only to manual reset.
3) Applicable only to actions which require the replacement of a part after
each operation.
4) Can only be reset during manufacturer servicing.
NOTE For controls having more than one automatic action, a different value
can be declared for each.
29 Not applicable
38 Not applicable
42 Operating pressure (or pressures) 3.3.11, 17,
H.17.4
52 Not applicable
Additional items:
101 Pressure medium 3.3.101,
X
9.3.101,
20.101
102 Operating differential 3.3.25,
D
H.17.4
H.17.6
103 Maximum working pressure 3.3.28, 9,
D
19, 20
Addition to Footnote h:
For pressure sensing controls, limits of activating quantity are specified either in the applicable appliance
standard, by the appliance manufacturer or as declared by the pressure sensing control manufacturer
(see 19.7 and 19.8).
6 Protection against electric shock
This clause of Part 1 is applicable.
7 Provision for protective earthing
This clause of Part 1 is applicable.
8 Terminals and terminations
This clause of Part 1 is applicable.
9 Constructional requirements
This clause of Part 1 is applicable except as follows:
9.4 Actions
Additional subclause:
9.4.101 Type 2.N action (for sensing actions, no increase in the operating value as a
result of any leakage from the sensing element or from parts connecting the
sensing element to the switch head)
A Type 2.N action shall be so designed that in the event of a leak in the sensing element, or
in any other part between the sensing element and the switch head, the declared disconnection
or interruption is provided before the sum of the declared operating pressure and drift is
exceeded.
Compliance is checked by the following test:
The operating pressure of a Type 2.N control shall be measured under the conditions of
Clause 17. If the control has means for setting, it shall be set to the highest value.
After this measurement, a hole is artificially produced in the sensing element and the
measurement of the operating pressure is repeated.
No positive drift is allowed beyond the declared value.
A separate shroud or sleeve may be employed for protection of the sensing element to achieve
conformance with Clause 20.
NOTE The test can be replaced by theoretical computations of the physical mode of operation.
9.11 Requirements during mounting, use, maintenance and servicing
Additional subclauses:
9.11.101 Parts in contact with a diaphragm shall have no sharp burrs, projections or the like
which chafe or abrade the diaphragm.
Compliance is checked by inspection before and after the tests of Clause 19.
9.11.102 An operating spring shall be retained and arranged to prevent abrasion, binding,
buckling or interference with its free movement.
Compliance is checked by inspection before and after the tests of Clause 19.
9.11.103 If failure of any part of the control would allow unsafe leakage of a hazardous fluid,
that part shall be made of a material having a melting point (solidus temperature) of not less
than 510 °C and a tensile strength of not less than 68 MPa at 204 °C.
Such parts shall not sag, distort, melt, oxidize or show leakage of fluid during any of the tests
specified herein.
Compliance is checked by inspection before and after the tests of Clause 19.
9.11.104 A part including a sheath, capillary tube, bellows or diaphragm shall be resistant to
atmospheric corrosion and attack by the fluid it can normally contact in service, if failure of the
part will permit external fluid leakage of a combustible fluid or cause the control to malfunction.
NOTE Brass alloys containing less than 81 % copper and more than 9 % zinc are not considered resistant to the
corrosive effects of fuel oils.
9.11.105 A control in which a flexible diaphragm, bellows or similar construction constitutes
the only flammable gas or fluid seal shall have the atmospheric side of the diaphragm or bellows
enclosed in a casing designed to limit external fluid leakage in the event of a diaphragm or
bellows rupture or shall have provisions for connection of a vent pipe or tubing intended to be
routed to the outdoors or other safe location.
2 2
9.11.106 A control designed to supervise the pressure of fuel oil of 1,00 mm /s to 600 mm /s
viscosity is not required to conform to 20.101 and 20.102, provided three samples of the control,
when subjected to a 100 000 cycle endurance test, show no evidence of leakage during the test
and when subjected to a hydrostatic test of four times the maximum working pressure, following
the endurance test, and the control conforms to one of the following:
a) the bellows, Bourdon tube, diaphragm or similar element is made of stainless steel or
material of equivalent resistance to corrosion designated material class A, if leakage from
a ruptured element will be into the control enclosure, in which case such leakage is to be
released to the exterior of the control before entering any opening provided for conduit
connection, or
b) the bellows, Bourdon tube, diaphragm or similar element is made of stainless steel or
material of equivalent resistance to corrosion designated material class B, if leakage from
a ruptured element will be to the exterior of the control enclosure only.
NOTE 1 Suitable class A and B materials are shown in Annex BB.
NOTE 2 1 mm /s = 1 centistoke.
Additional subclauses:
9.101 Construction requirements relating to operating mechanism
9.101.1 If screws and nuts serve to attach operating parts to movable members, they shall be
swaged or otherwise locked.
9.101.2 The operating mechanism of a manually operated switch shall not subject parts to
damage.
9.101.3 Operating parts shall be separated by barriers or by their physical location from
conductors to be connected to the control to avoid interference with the movement of such parts
by the conductors.
Compliance with 9.101.1 to 9.101.3 inclusive is checked by inspection.
9.102 A pressure cut-out shall not reset or be resettable manually or otherwise at a value
above the maximum or below the minimum operating pressure, whichever is declared.
9.103 A pressure cut-out with a manually operated reset device shall be trip-free.
Compliance with 9.102 and 9.103 is checked by inspection.
10 Threaded parts and connections
This clause of Part 1 is applicable.
11 Creepage distances, clearances and distances through solid insulation
This clause of Part 1 is applicable.
12 Components
This clause of Part 1 is applicable.
13 Fault assessment on electronic circuits
This clause of Part 1 is applicable except as follows:
13.1 Fault assessment for inherent safety
13.1.3 Component fault assessment
13.1.3.8 Compliance criteria
Item c) is not applicable.
14 Moisture and dust resistance
This clause of Part 1 is applicable except as follows:
14.1 Protection against ingress of water and dust
14.1.1 Addition:
The tests in this subclause are not intended to determine the suitability of the seal between the
control and the equipment.
15 Electric strength and insulation resistance
This clause of Part 1 is applicable.
16 Heating
This clause of Part 1 is applicable.
17 Manufacturing deviation and drift
This clause of Part 1 is applicable.
18 Environmental stress
This clause of Part 1 is applicable.
19 Endurance
This clause of Part 1 is applicable except as follows:
19.1 General requirements
19.1.5 Compliance criteria
Replacement:
Compliance with 19.1.2 and 19.1.3 is checked by the tests of 19.15.
19.1.6 Test sequence and conditions
19.1.6.2 Addition:
The tests of Clause 19 shall be conducted at the declared maximum working pressure and
operating differential as declared in Table 1, requirement 102 and 103.
19.15 Test for particular purpose controls
Additional subclauses:
19.15.101 Pressure operating controls
Subclauses 19.1 to 19.5 inclusive are applicable.
Subclause 19.6 is not applicable.
Subclauses 19.7 and 19.8 are applicable.
Subclause 19.9 is applicable, but only to slow-make, slow-break automatic actions.
Subclauses 19.10 to 19.13 inclusive are applicable but only to those pressure operating
controls which have a manual action (including an actuating means providing setting by the
user).
Subclause 19.14 is applicable.
19.15.102 Pressure limiter
Subclauses 19.1 to 19.5 inclusive are applicable.
Subclause 19.6 is not applicable.
Subclauses 19.7 and 19.8 are applicable except that, where necessary, the reset operation, if
required, is obtained by actuation. This actuation shall be as specified in 19.4 for accelerated
speed, as soon as permitted by the mechanism, or as declared by the manufacturer in Table 1,
requirement 31.
Subclause 19.9 is applicable, but only to slow-make, slow-break automatic actions, the same
conditions for manual reset for 19.7 and 19.8 being used.
Subclauses 19.10 to 19.13 inclusive are applicable but only to those pressure limiters which
have a manual action (including an actuating means providing setting by the user).
Subclauses 19.10 to 19.13 inclusive are not applicable to the normal reset manual action,
which is tested during the automatic test of 19.7 to 19.9 inclusive. If the pressure limiter has
other manual actions which are not tested during the automatic test, then these subclauses
are applicable.
Subclause 19.14 is applicable.
20 Mechanical strength
This clause of Part 1 is applicable except as follows:
Additional subclauses:
20.101 Medium leakage
Parts of pressure limiters or pressure cut-outs which are subjected to pressure of a fluid to
be supervised shall not leak externally at a rate in excess of 200 cm /h, when tested with air or
nitrogen at a pressure of 1,5 times the maximum working pressure of the control.
To determine compliance, the control shall be connected to a system capable of supplying
clean air or nitrogen at the specified test pressure. Any by-pass or other openings not essential
to the operation of the control during the test shall be sealed. Air or nitrogen shall be admitted
and maintained at the specified test pressure. In the case of a diaphragm element, which, in
normal usage, is subjected to pressure on both sides of the diaphragm, the test pressure shall
be applied to both sides of the diaphragm slowly and without shock to avoid stressing the
diaphragm excessively.
Leakage shall be observed by an apparatus capable of indicating accurately a flow rate of
200 cm /h for the test fluid employed. A control with a maximum working pressure of 35 kPa
or more can be considered as conforming to the above if, when the fluid-containing parts of the
control are submerged in water to a depth of approximately 25 mm while under the test
pressure, no bubble indicating leakage is observed within 10 s after the parts are submerged.
To conform to 9.11.105, a control shall not allow leakage under conditions of ruptured
diaphragm or bellows from an unthreaded vent opening or around pins, stems or linkages
passing through the housing in excess of the following rate, when the control is tested to its
maximum working pressure:
a) 0,03 m /h of a 0,64 specific gravity gas for a control for use only with fuel gases having
specific gravity less than 1,0;
NOTE 1 In the countries members of CENELEC, the leakage rate is 70 l/h.
b) 0,014 m /h of a 1,53 specific gravity gas for a control for use with liquified petroleum gases;
NOTE 2 In the countries members of CENELEC, the leakage rate is 70 l/h.
c) 0,001 m /h of water for a control for use with flammable liquids such as gasoline, kerosene
and fuel oils up to 1,2 mm /s;
3 2
d) 0,002 m /h of the lightest grade fuel oil heavier than 1,2 mm /s for which a control shall be
used.
20.102 Strength of parts (hydrostatic)
20.102.1 A pressure sensing control employing a Bourdon tube, a flexible metal bellows, a
diaphragm or the like rated 2 000 kPa or more, which is not contained within an enclosure, shall
withstand for 1 min without bursting a hydraulic pressure equal to four times the maximum
working pressure of the control.
The control under test shall be filled with water to exclude air and is connected to a hydraulic
pump. The pressure shall be raised gradually to the required test pressure.
Leakage at a gasket or fitting during this test is permitted provided the leakage does not occur
below 50 % of the required test pressure and the test can be continued to four times maximum
working pressure.
20.102.2 A pressure sensing control employing a Bourdon tube, a flexible metal bellows, a
diaphragm or the like that is contained within an enclosure shall comply with 20.102.1 or shall
– withstand for 1 min without visible leakage a hydraulic pressure of two times the maximum
working pressure, and
– withstand for 1 min a hydraulic pressure equal to four times the maximum working pressure
or, if this pressure cannot be reached without damage to the equipment, at least three times
maximum working pressure. Also, it shall be demonstrated that the enclosure can either
relieve pressure equal to four times maximum working pressure without rupturing in a
manner likely to endanger persons or surroundings, or that it can withstand the test
pressure.
The test is conducted as in 20.102.1.
20.102.3 A pressure limiter or pressure cut-out shall be capable of withstanding for 1 min
without bursting a hydraulic pressure equal to four times the maximum working pressure.
The control under test shall be filled with water to exclude air and connected to a hydraulic
pump. The pressure shall be raised gradually to the required test pressure.
21 Resistance to heat, fire and tracking
This clause of Part 1 is applicable.
22 Resistance to corrosion
This clause of Part 1 is applicable.
23 Electromagnetic compatibility (EMC) requirements - Emission
This clause of Part 1 is applicable.
24 Normal operation
This clause of Part 1 is applicable.
25 Electromagnetic compatibility (EMC) requirements - Immunity
This clause of Part 1 is applicable.
26 Abnormal operation tests
This clause of Part 1 is applicable.
Annex H
(normative)
Requirements related to functional safety
This annex of Part 1 is applicable except as follows:
H.3 Terms and definitions
H.3.21.2 Addition:
Note 101 to entry: In general, pressure cut-outs perform class B or C control functions.
H.3.21.3 Addition:
Note 101 to entry: In general, pressure cut-outs used on closed water heater systems perform class C control
functions.
H.5 Information
Table H.1 – Additional items to Table 1
Additional items:
Information Clause or Method
subclause
H.101 The output condition of pressure cut-outs, Type 2 operating controls and H.25.1.103,
H.25.1.104, X
Type 2 limiters after operation
H.25.1.105
H.102 Frequency of the defined state test function H.13.2.2.2,
H.13.2.3.2, X
H.13.2.3.3
H.103 The control is for permanent operation or non-permanent operation 3.3.102
3.3.103,
X
H.13.2.2.2,
H.13.2.3.2
Additional footnote:
For example, conducting or non-conducting, as applicable.

H.13 Fault assessment on electronic circuits
H.13.2 Fault assessment to ensure functional safety
H.13.2.2 Class B control function
H.13.2.2.2 First fault
Modification:
Replace item b) as follows:
b) the control shall react within the fault reaction time (see Table H.1, requirement H.11) by
proceeding to the defined state provided that a subsequent restart under the same fault
conditions results in the system returning to the same defined state condition;
Replace item c) as follows, adding the new Note:
c) for systems with non-permanent operation according to Table H.1 requirement H.103, the
control shall continue to operate as intended, the fault shall be detected during the next
start-up sequence. The compliance criteria shall be a) or b).
NOTE 101 Requirements for systems with permanent operation are under consideration.
Replace item d) as follows:
d) the control shall continue to operate as intended.
Replace the last two paragraphs with the following:
The fault reaction time shall be declared by the manufacturer (see Table H.1,
requirement H.11).
For permanent operation as declared by the manufacturer (see Table H.1, requirement
H.103), item c) is under consideration.
For a control function, where a mechanical actuator is part of a circuit that characterizes the
defined state, a test up to, but not including, the switching contacts is sufficient. If the test of
the defined state fails, the control shall initiate the safety shut-down. Frequency of test is as
declared by the manufacturer (see Table H.1, requirement H.102). Internal faults of the
components of the checking circuits are not considered.
H.13.2.3 Class C control function
H.13.2.3.2 First fault
Modification:
Replace item b) as follows:
b) the control reacting within the fault reaction time (see Table H.1, requirement H.11) by
proceeding to defined state provided that subsequent restart under the
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

Loading comments...