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SIST EN IEC 60079-18:2025

(Main)

Explosive atmospheres - Part 18: Equipment protection by encapsulation "m" (IEC 60079-18:2025)

Explosive atmospheres - Part 18: Equipment protection by encapsulation "m" (IEC 60079-18:2025)

IEC 60079-18:2025 gives the specific requirements for the construction, testing and marking of electrical Ex Equipment, parts of electrical Ex Equipment and Ex Components with the Type of Protection encapsulation "m" (hereinafter referred to as "m" Equipment) intended for use in explosive gas atmospheres or explosive dust atmospheres. For Levels of Protection "mb" and "mc", this document applies where the rated voltage does not exceed 11 kV ACRMS or DC. For Level of Protection "ma", this document applies where the rated voltage does not exceed 1 kV ACRMS or DC. This document does not take account of any hazard due to an emission of flammable or toxic gas from the dust. This document supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this document conflicts with a requirement of IEC 60079-0, the requirement of this document takes precedence. This fifth edition cancels and replaces the fourth edition published in 2014 and Amendment 1:2017. This edition constitutes a technical revision. This International Standard is to be used in conjunction with IEC 60079-0, Explosive atmospheres - Part 0: Equipment - General requirements. Users of this document are advised that interpretation sheets clarifying the interpretation of this document can be published. Interpretation sheets are available from the IEC webstore and can be found in the "history" tab of the page for each document. Please see the foreword to this document for the list of significant technical changes with respect to the previous edition.

Explosionsgefährdete Bereiche - Teil 18: Geräteschutz durch Vergusskapselung „m“ (IEC 60079-18:2025)

Atmosphères explosives - Partie 18: Protection du matériel par encapsulage "m" (IEC 60079-18:2025)

IEC 60079-18:2025 définit les exigences spécifiques à la construction, aux essais et au marquage de l’appareil Ex électrique, des parties de l’appareil Ex électrique et des composants Ex protégés par encapsulage "m" (ci-après désignés appareils "m") et destinés à une utilisation dans les atmosphères explosives gazeuses ou les atmosphères explosives de poussière. Pour les niveaux de protection "mb" et "mc", le présent document s’applique lorsque la tension assignée ne dépasse pas 11 kV en courant alternatif efficace ou en courant continu. Pour le niveau de protection "ma", le présent document s’applique lorsque la tension assignée ne dépasse pas 1 kV en courant alternatif efficace ou en courant continu. Le présent document ne tient pas compte des dangers, quels qu’ils soient, résultant d’une émission de gaz inflammable ou toxique provenant de la poussière. Le présent document complète et modifie les exigences générales de l’IEC 60079-0. Si une exigence du présent document est en conflit avec une exigence de l’IEC 60079-0, l’exigence du présent document prévaut. Cette cinquième édition annule et remplace la quatrième édition parue en 2014, ainsi que l’Amendement 1:2017. Cette édition constitue une révision technique. Cette Norme internationale doit être utilisée conjointement avec l’IEC 60079-0, Atmosphères explosives - Partie 0: Matériel - Exigences générales. Les modifications techniques majeures suivantes par rapport à l’édition précédente se trouvent en avant-propos.

Eksplozivne atmosfere - 18. del: Zaščita opreme z zalivanjem z zalivno maso "m" (IEC 60079-18:2025)

General Information

Status
Published
Public Enquiry End Date
20-Jun-2024
Publication Date
12-Nov-2025
ICS
29.260.20 - Electrical apparatus for explosive atmospheres
Technical Committee
EXP - Product for explosive atmospheres
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-Oct-2025
Due Date
02-Jan-2026
Completion Date
13-Nov-2025
Directive
2008/68/EC - Directve 2008/68/EC of the European Parliament and of the council of 24 September 2008 on the inland transport of the dangerous goods
2014/34/EU - Directive 2014/34/EU Of The European Parliament And Of The Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast)
Mandate
M/596 - [C(2023)4798] Commission Implementing Decision of 20.7.2023 on a standardisation request as regards equipment and protective systems intended for use in potentially explosive atmospheres in support of Directive 2014/34/EU (ATEX) of the European Parliament and of the Council
Ref Project
EN IEC 60079-18:2025 - Explosive atmospheres - Part 18: Equipment protection by encapsulation "m"

Relations

Revises
SIST EN 60079-18:2015 - Explosive atmospheres - Part 18: Equipment protection by encapsulation "m" (IEC 60079-18:2014)
Effective Date
13-Dec-2022
Revises
SIST EN 60079-18:2015/AC:2018 - Explosive atmospheres - Part 18: Equipment protection by encapsulation "m" (IEC 60079-18:2014/COR1:2018)
Effective Date
13-Dec-2022
Revises
SIST EN 60079-18:2015/A1:2018 - Explosive atmospheres - Part 18: Equipment protection by encapsulation "m"
Effective Date
13-Dec-2022
SIST EN IEC 60079-18:2025SIST EN IEC 60079-18:2025
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SLOVENSKI STANDARD
01-december-2025
Eksplozivne atmosfere - 18. del: Zaščita opreme z zalivanjem z zalivno maso "m"
(IEC 60079-18:2025)
Explosive atmospheres - Part 18: Equipment protection by encapsulation "m" (IEC
60079-18:2025)
Explosionsgefährdete Bereiche - Teil 18: Geräteschutz durch Vergusskapselung „m“
(IEC 60079-18:2025)
Atmosphères explosives - Partie 18: Protection du matériel par encapsulage "m" (IEC
60079-18:2025)
Ta slovenski standard je istoveten z: EN IEC 60079-18:2025
ICS:
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60079-18

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2025
ICS 29.260.20 Supersedes EN 60079-18:2015; EN 60079-
18:2015/A1:2017; EN 60079-18:2015/AC:2018-09
English Version
Explosive atmospheres - Part 18: Equipment protection by
encapsulation "m"
(IEC 60079-18:2025)
Atmosphères explosives - Partie 18: Protection de l'appareil Explosionsgefährdete Bereiche - Teil 18: Geräteschutz
par encapsulage "m" durch Vergusskapselung "m"
(IEC 60079-18:2025) (IEC 60079-18:2025)
This European Standard was approved by CENELEC on 2025-07-24. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60079-18:2025 E

European foreword
The text of document 31/1858/FDIS, future edition 5 of IEC 60079-18, prepared by TC 31 "Equipment
for explosive atmospheres" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60079-18:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-10-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-10-31
document have to be withdrawn
This document supersedes EN 60079-18:2015 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a standardization request addressed to CENELEC by the
European Commission. The Standing Committee of the EFTA States subsequently approves these
requests for its Member States.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60079-18:2025 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60079-1 NOTE Approved as EN 60079-1
IEC 60079-2 NOTE Approved as EN 60079-2
IEC 60079-5 NOTE Approved as EN 60079-5
IEC 60079-6 NOTE Approved as EN 60079-6
IEC 60079-10-1 NOTE Approved as EN IEC 60079-10-1
IEC 60079-10-2 NOTE Approved as EN 60079-10-2
IEC 60079-14 NOTE Approved as EN IEC 60079-14
IEC 60079-26 NOTE Approved as EN IEC 60079-26
IEC 60079-28 NOTE Approved as EN 60079-28
IEC 60086-1 NOTE Approved as EN IEC 60086-1
IEC 60622 NOTE Approved as EN 60622
IEC 60664-1 NOTE Approved as EN IEC 60664-1
IEC 60747-5-5 NOTE Approved as EN IEC 60747-5-5
IEC 61951-1 NOTE Approved as EN 61951-1
IEC 61951-2 NOTE Approved as EN 61951-2
ISO 13849-1 NOTE Approved as EN ISO 13849-1
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60079-0 - Explosive atmospheres - Part 0: Equipment EN IEC 60079-0 -
- General requirements
IEC 60079-7 - Explosive atmospheres - Part 7: Equipment EN 60079-7 -
protection by increased safety "e"
IEC 60079-11 - Explosive atmospheres - Part 11: Equipment EN IEC 60079-11 -
protection by intrinsic safety "i"
IEC 60079-15 - Explosive atmospheres - Part 15: Equipment EN IEC 60079-15 -
protection by type of protection "n"
IEC 60127 series Miniature fuses EN IEC 60127 series
IEC 60243-1 - Electric strength of insulating materials - EN 60243-1 -
Test methods - Part 1: Tests at power
frequencies
IEC 60691 - Thermal-links - Requirements and EN IEC 60691 -
application guide
IEC 60730-2-9 - Automatic electrical controls - Part 2-9: EN IEC 60730-2-9 -
Particular requirements for temperature
sensing control
IEC 60738-1 - Thermistors - Directly heated positive EN IEC 60738-1 -
temperature coefficient - Part 1: Generic
specification
IEC 61140 - Protection against electric shock - Common EN 61140 -
aspects for installation and equipment
IEC 61558-1 - Safety of transformers, reactors, power EN IEC 61558-1 -
supply units and combinations thereof - Part
1: General requirements and tests
IEC 61558-2-6 - Safety of transformers, reactors, power EN IEC 61558-2-6 -
supply units and combinations thereof - Part
2-6: Particular requirements and tests for
safety isolating transformers and power
supply units incorporating safety isolating
transformers for general applications
Publication Year Title EN/HD Year
IEC 62326-4-1 - Printed boards - Part 4: Rigid multilayer EN 62326-4-1 -
printed boards with interlayer connections -
Sectional specification - Section 1:
Capability detail specification - Performance
levels A, B and C
ANSI/UL 248 series Standard for low-voltage fuses - -
ANSI/UL 746A - Polymeric Materials - Short Term Property - -
Evaluations
ANSI/UL 796 - Printed-Wiring Boards - -
IPC-A-600 - Acceptability of Printed Boards - -
IPC-6012 - Qualification and Performance Specification - -
for Rigid Printed Boards
IEC 60079-18 ®
Edition 5.0 2025-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 18: Equipment protection by encapsulation "m"

Atmosphères explosives –
Partie 18: Protection de l’appareil par encapsulage "m"
ICS 29.260.20  ISBN 978-2-8327-0471-4

IEC 60079-18:2025-06(en-fr)
– 2 – IEC 60079-18:2025 © IEC 2025
CONTENTS
FOREWORD . 5
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 General requirements . 11
4.1 Level of Protection (Equipment Protection Level (EPL)) . 11
4.2 Rated voltage and maximum prospective current . 11
4.3 Additional requirements for Levels of Protection "ma" and "mb" . 11
5 Requirements for compounds . 11
5.1 General . 11
5.2 Specification . 12
5.3 Properties of the compound . 12
5.3.1 Water absorption . 12
5.3.2 Dielectric strength . 12
6 Temperatures . 12
6.1 General . 12
6.2 Maximum surface temperature . 13
6.3 Service temperature of the compound . 13
6.4 Temperature limitation of the "m" equipment . 13
7 Constructional requirements . 13
7.1 General . 13
7.2 Determination of faults . 14
7.2.1 Fault examination . 14
7.2.2 Components considered as not subject to fail . 14
7.2.3 Isolating components . 15
7.2.4 Infallible separation distances . 15
7.3 Free space in the encapsulation . 16
7.3.1 Group III "m" Equipment . 16
7.3.2 Group I and Group II "m" Equipment . 17
7.4 Thickness of the compound. 18
7.4.1 "m" Equipment . 18
7.4.2 Windings for electrical machines . 20
7.4.3 Rigid, multi-layer printed wiring boards with through connections . 20
7.5 Switching contacts . 21
7.5.1 General . 21
7.5.2 Level of Protection "ma" . 21
7.5.3 Level of Protection "mb" . 21
7.5.4 Level of Protection "mc" . 21
7.6 External connections . 22
7.6.1 General . 22
7.7 Protection of bare live parts . 22
7.8 Cells and batteries . 22
7.8.1 General . 22
7.8.2 Prevention of gassing . 22
7.8.3 Protection against inadmissible temperatures and damage to the cells
or batteries . 22

IEC 60079-18:2025 © IEC 2025 – 3 –
7.8.4 Reverse current . 23
7.8.5 Current limitation . 23
7.8.6 Protection against the polarity inversion and deep discharge of the cells .
...

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Explosive atmospheres - Part 49: Flame arresters - Performance requirements, test methods and limits for use (ISO/IEC 80079-49:2024)
EN ISO/IEC 80079-49:2024

This document specifies the requirements for flame arresters that prevent flame transmission when explosive gas-air or vapour-air mixtures are present. It establishes uniform principles for the classification, basic construction and information for use, including the marking of flame arresters, and specifies test methods to verify the safety requirements and determine safe limits of use. This document is applicable to pressures ranging from 80 kPa to 160 kPa and temperatures ranging from -20 °C to +200 °C. This document does not apply to the following: - external safety-related measurement and control equipment that might be required to keep the operational conditions within the established safe limits; - flame arresters used for explosive mixtures of vapours and gases, which tend to self-decompose (for example, acetylene) or which are chemically unstable; - flame arresters used for carbon disulfide, due to its special properties; - flame arresters whose intended use is for mixtures other than gas-air or vapour-air mixtures (for example, higher oxygen-nitrogen ratio, chlorine as oxidant); - flame arrester test procedures for reciprocating internal combustion engines; - fast acting valves, extinguishing systems and other explosion isolating systems; - Flame arresters used in gas detectors (those being covered for example, by IEC 60079‑29‑1 and IEC 62990‑1). This edition cancels and replaces ISO 16852:2016, which has been technically revised. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to ISO 16852:2016: a) adaptation of the relevant IEC TC 31 requirements on standards; b) modification of the upper limit of the temperature range from 150 °C to 200 °C under the condition that T0 shall be not larger than 80 % of the auto ignition temperature of the gas-air-mixture; c) change of the term "explosion group" to "equipment group" due to editorial requirements in IEC/TC 31; d) clarification of the conditions and requirements for flame arresters whose intended operating conditions are outside the atmospheric conditions in 7.3.4 and 7.3.5; e) clarification of the requirements on the information for use in Clause 12 f) concerning the burn time; f) addition of a permission to the construction requirements both in 7.1 and 14.1 to substitute visual inspection by performing a flow test; g) addition of a flow chart for the evaluation of test results as Annex D

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SIST
SIST EN 13237:2024(Main)
Potentially explosive atmospheres - Terms and definitions for equipment and protective systems intended for use in potentially explosive atmospheres
EN 13237:2024

This document specifies terms and definitions (vocabulary) to be used in suitable standards dealing with equipment and protective systems intended for use in potentially explosive atmospheres within the scope of Directive 2014/34/EU.
NOTE   Terms and definitions avoid misunderstandings that are important in relation to the essential health and safety requirements of Directive 2014/34/EU.

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