EN IEC 60079-11:2024
(Main)Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
This part of IEC 60079 specifies the construction and testing of intrinsically safe apparatus intended for use in an explosive atmosphere, and for associated apparatus which is intended for connection to intrinsically safe circuits which enter such atmospheres. This Type of Protection is applicable to electrical equipment in which the electrical circuits themselves are incapable of causing ignition of a surrounding explosive atmosphere. This includes electrical equipment which contains circuits that are intrinsically safe only under certain conditions, for example under battery supply with mains supply removed. This standard is also applicable to electrical equipment or parts of electrical equipment located outside the explosive atmosphere or protected by another Type of Protection listed in IEC 60079-0, where the intrinsic safety of the electrical circuits in the explosive atmosphere may depend upon the design and construction of such electrical equipment or parts of such electrical equipment. The electrical circuits exposed to the explosive atmosphere are assessed for use in such an atmosphere by applying this standard. This standard applies to sensors connected to intrinsically safe circuits but does not apply to the protection of catalytic elements for Group IIC or Group IIB + H2. The requirements for intrinsically safe systems are provided in IEC 60079-25. This standard supplements and modifies the general requirements of IEC 60079-0, except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence. Unless otherwise stated, the requirements in this standard are applicable to both intrinsically safe apparatus and associated apparatus, and the generic term "apparatus" is used throughout the standard. As this standard applies only to electrical equipment, the term "equipment" used in the standard always means “electrical equipment”. This standard applies to apparatus for use under the atmospheric conditions of IEC 60079-0 with additional requirements for for use at lower atmospheric pressures in the range from 60 kPa (0,6 bar), up to 110 kPa (1,1 bar). [...]
Explosionsgefährdete Bereiche - Teil 11: Geräteschutz durch Eigensicherheit "i"
Atmosphères explosives - Partie 11: Protection de l'équipement par sécurité intrinsèque "i"
IEC 60079-11:2023 spécifie la construction et les essais pour le matériel électrique de sécurité intrinsèque destiné à être utilisé dans les atmosphères explosives et pour le matériel électrique associé destiné à être relié à des circuits de sécurité intrinsèque qui entrent dans de telles atmosphères. Ce mode de protection s’applique à l’appareil électrique dont les circuits électriques sont eux mêmes incapables de provoquer une inflammation dans l’atmosphère explosive environnante. Il inclut l’appareil électrique qui contient des circuits qui sont de sécurité intrinsèque uniquement dans certaines conditions, par exemple alimentés par batterie et alimentation réseau coupée. Le présent document s’applique également à l’appareil électrique ou aux parties d’appareil électrique situés hors de l’atmosphère explosive ou protégés par un autre mode de protection cité dans l’IEC 60079 0, si la sécurité intrinsèque des circuits électriques situés dans l’atmosphère explosive peut dépendre de la conception et de la construction de cet appareil électrique ou de ces parties d’appareil électrique. Les circuits électriques exposés à une atmosphère explosive sont évalués en vue de leur emploi dans de telles atmosphères en appliquant le présent document. Le présent document s’applique aux capteurs reliés à des circuits de sécurité intrinsèque, mais elle ne s’applique pas à la protection d’éléments catalytiques pour le Groupe IIC ou le Groupe IIB + H2. Le présent document ne s’applique pas aux entrées de câbles d’appareils Ex. Les exigences pour les circuits de sécurité intrinsèque sont fournies dans l’IEC 60079-25. Le présent document complète et modifie les exigences générales de l’IEC 60079-0. Si une exigence du présent document entre en conflit avec une exigence de l’IEC 60079-0, l’exigence du présent document prévaut. Sauf indication contraire, les exigences du présent document s’appliquent au matériel de sécurité intrinsèque et au matériel associé, et le terme générique "matériel" est utilisé dans toute la norme. Comme le présent document s’applique uniquement à l’appareil électrique, le terme "appareil" utilisé dans la norme signifie toujours "appareil électrique". Le présent document s’applique au matériel à utiliser dans les conditions atmosphériques de l’IEC 60079-0 avec les exigences supplémentaires pour son utilisation à des pressions atmosphériques supérieures comprises entre 60 kPa (0,6 bar) et 110 kPa (1,1 bar). Cette septième édition annule et remplace la sixième édition parue en 2011. Cette édition constitue une révision technique L'identification et la signification des changements entre la CEI 60079-11, Édition 7 (2022) et la CEI 60079-11, Édition 6 (2011 + Corrigendum 1 (2012)) peuvent être trouvées dans le tableau des modifications dans l'avant-propos de la publication
Eksplozivne atmosfere - 11. del: Zaščita opreme z lastno varnostjo "i" (IEC 60079-11:2023 + COR1:2023)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2025
Eksplozivne atmosfere - 11. del: Zaščita opreme z lastno varnostjo "i" (IEC 60079-
11:2023 + COR1:2023)
Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i" (IEC 60079-
11:2023 + COR1:2023)
Explosionsgefährdete Bereiche - Teil 11: Geräteschutz durch Eigensicherheit "i" (IEC
60079-11:2023 + COR1:2023)
Atmosphères explosives - Partie 11: Protection de l'équipement par sécurité intrinsèque
"i" (IEC 60079-11:2023 + COR1:2023)
Ta slovenski standard je istoveten z: EN IEC 60079-11:2024
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 60079-11
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2024
ICS 29.260.20 Supersedes EN 60079-11:2012
English Version
Explosive atmospheres - Part 11: Equipment protection by
intrinsic safety "i"
(IEC 60079-11:2023 + COR1:2023)
Atmosphères explosives - Partie 11: Protection de Explosionsgefährdete Bereiche - Teil 11: Geräteschutz
l'équipement par sécurité intrinsèque "i" durch Eigensicherheit "i"
(IEC 60079-11:2023 + COR1:2023) (IEC 60079-11:2023 + COR1:2023)
This European Standard was approved by CENELEC on 2024-10-16. 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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60079-11:2024 E
European foreword
The text of document 31G/352/FDIS, future edition 7 of IEC 60079-11 + COR1:2023, prepared by
SC 31G "Intrinsically-safe apparatus" of IEC/TC 31 "Equipment for explosive atmospheres" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 60079-11:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-12-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-12-31
document have to be withdrawn
This document supersedes EN 60079-11:2012 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.
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 60079-11:2023 + COR1:2023 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 60068-2-14 NOTE Approved as EN IEC 60068-2-14
IEC 60068-2-78 NOTE Approved as EN 60068-2-78
IEC 60079-14 NOTE Approved as EN IEC 60079-14
IEC 60079-18 NOTE Approved as EN 60079-18
IEC 60079-19 NOTE Approved as EN IEC 60079-19
IEC 60079-28 NOTE Approved as EN 60079-28
IEC 60364-4-41 NOTE Approved as HD 60364-4-41
IEC 61086-1 NOTE Approved as EN 61086-1
IEC 61191-2 NOTE Approved as EN 61191-2
IEC 62133-1 NOTE Approved as EN 62133-1
IEC 62368-1 NOTE Approved as EN IEC 62368-1
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: EN IEC 60079-0 -
Equipment - General requirements
IEC 60079-7 - Explosive atmospheres - Part 7: EN 60079-7 -
Equipment protection by increased safety
"e"
IEC 60079-25 - Explosive atmospheres - Part 25: EN IEC 60079-25 -
Intrinsically safe electrical systems
IEC 60085 - Electrical insulation - Thermal evaluation EN 60085 -
and designation
IEC 60112 - Method for the determination of the proof EN IEC 60112 -
and the comparative tracking indices of
solid insulating materials
IEC 60127 series Miniature fuses EN IEC 60127 series
IEC 60317-0-1 - Specifications for particular types of EN 60317-0-1 -
winding wires - Part 0-1: General
requirements - Enamelled round copper
wire
IEC 60529 - Degrees of protection provided by EN 60529 -
enclosures (IP Code)
IEC 60664-1 - Insulation coordination for equipment EN IEC 60664-1 -
within low-voltage supply systems - Part 1:
Principles, requirements and tests
IEC 60664-3 - Insulation coordination for equipment EN 60664-3 -
within low-voltage systems - Part 3: Use of
coating, potting or moulding for protection
against pollution
IEC 60691 - Thermal-links - Requirements and EN IEC 60691 -
application guide
IEC 60747-5-5 - Semiconductor devices - Part 5-5: EN IEC 60747-5-5 -
Optoelectronic devices - Photocouplers
Publication Year Title EN/HD Year
IEC 60747-17 - Semiconductor devices - Part 17: Magnetic EN IEC 60747-17 -
and capacitive coupler for basic and
reinforced insulation
IEC 60851-5 - Winding wires - Test methods - Part 5: EN 60851-5 -
Electrical properties
IEC 61010-1 - Safety requirements for electrical EN 61010-1 -
equipment for measurement, control, and
laboratory use - Part 1: General
requirements
IEC 61158-2 - Industrial communication networks - EN IEC 61158-2 -
Fieldbus specifications - Part 2: Physical
layer specification and service definition
IEC 61810-1 - Electromechanical elementary relays - Part EN 61810-1 -
1: General and safety requirements
IEC 62133-2 - Secondary cells and batteries containing EN 62133-2 -
alkaline or other non-acid electrolytes -
Safety requirements for portable sealed
secondary lithium cells, and for batteries
made from them, for use in portable
applications - Part 2: Lithium systems
ANSI/UL 248 series Standard for low-voltage fuses - series
ANSI/UL 746E - Polymeric Materials - Industrial Laminates, - -
Filament Wound Tubing, Vulcanized Fibre,
and Materials Used In Printed Wiring
Boards
UL 810A - Standard for Electrochemical Capacitors - -
DIN VDE V 0884-11 - Semiconductor devices - Part 11: Magnetic - -
and capacitive coupler for basic and
reinforced isolation
IEC 60079-11 ®
Edition 7.0 2023-01
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 11: Equipment protection by intrinsic safety "i"
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-6271-9
IEC 60079-11:2023/ISH1:2024 – 1 –
© IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60079-11
Edition 7.0 2023-01
EXPLOSIVE ATMOSPHERES –
Part 11: Equipment protection by intrinsic safety "i"
INTERPRETATION SHEET 1
This interpretation sheet has been prepared by subcommittee 31G: Intrinsically-safe apparatus,
of IEC technical committee 31: Equipment for explosive atmospheres.
The text of this interpretation sheet is based on the following documents:
DISH Report on voting
31G/392/DISH 31G/397/RVDISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
IEC 60079-11:2023 (Edition 7.0)
Explosive atmospheres – Part 11: Equipment protection by intrinsic safety “i”
Background
5.4.1 of IEC 60079-11:2023 states, in part:
All surfaces of intrinsically safe apparatus that come into contact with explosive atmospheres
shall be assessed to ensure that, under the conditions specified in 5.2, the apparatus complies
with the maximum surface temperature requirements of IEC 60079-0.
Question
Is "all surfaces of intrinsically safe apparatus that come into contact with explosive
atmospheres", as referenced in 5.4.1 for thermal ignition compliance, intended to mean the
junction temperature of a sealed semiconductor?
ICS 29.260.20
IEC 60079-11:2023-01/ISH1:2024-05(en)
– 2 – IEC 60079-11:2023/ISH1:2024
© IEC 2024
Answer
No. It is not necessary to consider temperatures within a sealed semiconductor for thermal
ignition compliance. It is not necessary to test a packaged component to confirm sealing. It is
not necessary for the packaging of such a component to conform to the encapsulation
requirements of IEC 60079-11.
An example of a sealed semiconductor is one which is fabricated into a package by the
semiconductor manufacturer using moulding or an equivalent process, such that the explosive
atmosphere is excluded, such as SOIC, DIP, QFN, SOT.
IEC 60079-11:2023/ISH2:2024 – 1 –
© IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60079-11
Edition 7.0 2023-01
EXPLOSIVE ATMOSPHERES –
Part 11: Equipment protection by intrinsic safety "i"
INTERPRETATION SHEET 2
This interpretation sheet has been prepared by subcommittee 31G: Intrinsically-safe apparatus,
of IEC technical committee 31: Equipment for explosive atmospheres.
The text of this interpretation sheet is based on the following documents:
DISH Report on voting
31G/393/DISH 31G/398/RVDISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
IEC 60079-11:2023 (Edition 7.0)
Explosive atmospheres – Part 11: Equipment protection by intrinsic safety “i”
Background
Table 22, "Rating and failure modes of PPTC devices used to limit current", includes ITRIP as
a parameter requiring a safety factor of 1,0.
Question 1
Where Table 22 applies a safety factor of 1,0 for ITRIP, is external current limitation required
to achieve the safety factor?
ICS 29.260.20
IEC 60079-11:2023-01/ISH2:2024-05(en)
– 2 – IEC 60079-11:2023/ISH2:2024
© IEC 2024
Answer 1
No. A PPTC may be considered to self-limit the current for the purpose of achieving the required
safety factor. Faults still need to be applied according to Table 22.
Question 2
Does IEC 60079-11 permit a PPTC device to be used to limit current for the purpose of spark
ignition compliance?
Answer 2
No. Subclause 7.16.3 only permits the use of a PPTC device to limit current for the purposes
of thermal ignition compliance, power rating of components, and the determination of P .
o
IEC 60079-11:2023/ISH3:2024 – 1 –
© IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60079-11
Edition 7.0 2023-01
EXPLOSIVE ATMOSPHERES –
Part 11: Equipment protection by intrinsic safety “i”
INTERPRETATION SHEET 3
This interpretation sheet has been prepared by subcommittee 31G: Intrinsically-safe apparatus,
of IEC technical committee 31: Explosive atmospheres.
The text of this interpretation sheet is based on the following documents:
DISH Report on voting
31G/400/DISH 31G/403/RVDISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
IEC 60079-11 Edition 7.0 2023
EXPLOSIVE ATMOSPHERES – Part 11: Equipment protection by intrinsic safety “i”
Background
Devices which read from memory during operation are clearly programmable components and
need to be considered according to 7.7.8. IEC 60079-11 is not clear whether a component which
only reads from memory or internal registers during initialisation – such as a digital
potentiometer – is a programmable component according to 7.7.8 or a simpler semiconductor
which can be considered according to 7.7.2.
Question
Can a digital potentiometer (or other similar device) which relies on reading from memory or an
internal register only during initialization to set the resistance value be used as a component
on which intrinsic safety depends for Levels of
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.