SIST EN IEC 60079-11:2025
(Main)Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i" (IEC 60079-11:2023 + COR1:2023)
Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i" (IEC 60079-11:2023 + COR1:2023)
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" (IEC 60079-11:2023 + COR1:2023)
Atmosphères explosives - Partie 11: Protection de l'équipement par sécurité intrinsèque "i" (IEC 60079-11:2023 + COR1:2023)
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)
Ta del standarda IEC 60079 določa konstrukcijo in preskušanje lastnovarnih naprav, namenjenih uporabi v eksplozivni atmosferi, in povezanih naprav, namenjenih povezavi z lastnovarnimi tokokrogi, ki vstopajo v take atmosfere. Ta vrsta zaščite se uporablja za električno opremo, v kateri električni tokokrogi sami ne morejo povzročiti vžiga v okoliški eksplozivni atmosferi. To vključuje električno opremo, pri kateri so tokokrogi lastnovarni le pod določenimi pogoji, npr. pri napajanju iz baterij, ko je omrežno napajanje odklopljeno. Ta standard se uporablja tudi za električno opremo ali dele električne opreme, ki je zunaj eksplozivne atmosfere ali jo varuje še ena vrsta zaščite, navedena v standardu IEC 60079-0, pri čemer je lastna varnost električnih tokokrogov v eksplozivni atmosferi lahko odvisna od zasnove in konstrukcije take električne opreme ali delov take električne opreme. Uporaba električnih tokokrogov, izpostavljenih eksplozivni atmosferi, se oceni s tem standardom. Ta standard se uporablja za senzorje, povezane z lastnovarnimi tokokrogi, vendar se ne uporablja za zaščito katalitičnih elementov za skupino IIC ali skupino IIB + H2. Zahteve za lastnovarne sisteme so podane v standardu IEC 60079-25. Ta standard dopolnjuje in spreminja splošne zahteve standarda IEC 60079-0, razen kot je prikazano v preglednici 1. Kadar je zahteva iz tega standarda v nasprotju z zahtevo iz standarda IEC 60079-0, ima prednost zahteva iz tega standarda. Če ni navedeno drugače, se zahteve iz tega standarda uporabljajo za lastnovarne naprave in povezane naprave, splošni izraz »naprava« pa se uporablja v celotnem standardu. Ta standard se uporablja le za električno opremo, zato izraz »oprema« v njem vedno pomeni »električno opremo«. Ta standard se uporablja za naprave, namenjene uporabi v atmosferskih pogojih iz standarda IEC 60079-0, pri čemer veljajo dodatne zahteve za uporabo pri nižjih atmosferskih tlakih v območju od 60 kPa (0,6 bara) do 110 kPa (1,1 bara). [...]
General Information
- Status
- Published
- Public Enquiry End Date
- 24-Jan-2021
- Publication Date
- 13-Apr-2025
- Technical Committee
- EXP - Product for explosive atmospheres
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 10-Dec-2024
- Due Date
- 14-Feb-2025
- Completion Date
- 14-Apr-2025
Overview
EN IEC 60079-11:2024 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i" (CLC/CENELEC adoption of IEC 60079-11:2023 + COR1:2023) specifies construction, testing and assessment criteria for intrinsically safe (IS) electrical apparatus and for associated apparatus intended for connection to IS circuits that enter explosive atmospheres. This European edition supersedes EN 60079-11:2012 and was approved by CENELEC in October 2024.
Key scope points:
- Applies to electrical equipment whose circuits are incapable of causing ignition, including equipment that is IS only under certain conditions (e.g., battery supply with mains removed).
- Covers apparatus inside and outside hazardous areas when intrinsic safety depends on their design.
- Applies to sensors connected to intrinsically safe circuits (with some exclusions for specific catalytic elements).
- Supplements and overrides general requirements in IEC 60079-0 where conflicts exist.
- Includes assessment under IEC 60079-0 atmospheric conditions plus additional lower-pressure conditions (60 kPa to 110 kPa).
Key topics and requirements
- Ignition compliance - Methods and criteria for both spark ignition and thermal ignition assessments.
- Levels of Protection (LoP) - Requirements and assessment conditions for LoP ia, ib, and ic.
- Apparatus construction - Enclosures, wiring, PCB tracks, component selection and temperature control.
- Component and system testing - Fault conditions, power/energy limits, temperature evaluation and proofs of compliance.
- Associated apparatus - Requirements for devices outside the explosive atmosphere that affect IS circuits.
- Clarifications and interpretation - Interpretation sheets in the standard address practical issues such as sealed semiconductor temperatures, use of PPTC devices, and programmable components.
Practical applications
EN IEC 60079-11 is essential when designing, manufacturing or certifying equipment intended for hazardous areas:
- Process and chemical plants, oil & gas facilities, mining, and hydrogen/renewable energy sites.
- Sensors, transmitters, handheld instruments, battery-powered devices and control equipment connected to IS circuits.
- Use cases where equipment must remain safe under fault conditions or conditional IS configurations.
Who uses this standard
- Electrical design and product engineers
- Certification bodies and notified test laboratories
- Quality, compliance and safety managers in hazardous industries
- Manufacturers of intrinsically safe equipment, sensors and associated apparatus
Related standards
- IEC/EN 60079-0 (General requirements)
- IEC/EN 60079-25 (Intrinsically safe electrical systems)
- IEC/EN 60079-14, IEC/EN 60079-18, IEC/EN 60079-19
- IEC 60664-1, IEC 62133-2 and other referenced IEC/EN publications
By following EN IEC 60079-11:2024, organizations ensure electrical equipment connected to IS circuits meets rigorous design and test criteria for safe use in explosive atmospheres.
Frequently Asked Questions
SIST EN IEC 60079-11:2025 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i" (IEC 60079-11:2023 + COR1:2023)". This standard covers: 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). [...]
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). [...]
SIST EN IEC 60079-11:2025 is classified under the following ICS (International Classification for Standards) categories: 29.260.20 - Electrical apparatus for explosive atmospheres. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN IEC 60079-11:2025 is associated with the following European legislation: EU Directives/Regulations: 2008/68/EC, 2014/34/EU; Standardization Mandates: M/086, M/BC/CEN/92/46, M/TDG. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase SIST EN IEC 60079-11:2025 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
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 Protection “ia” and “ib”?
ICS 29.260.20
IEC 60079-11:2023-01/ISH3:2024-08(en)
– 2 – IEC 60079-11:2023/ISH3:2024
© IEC 2024
Answer
No. Such a device is considered a programmable component according to 7.7.8 and its failure
modes should be considered accordingly. Memory is fundamental to the main function of the
component.
Digital potentiometers (or other similar devices) which can be used as components on which
intrinsic safety depends according to 7.7.2 include those which:
1) have their resistance (or other value) set during manufacture of the equipment or component
(for example configuration fuse bits or laser trimming),
2) do not rely on reading from memory or internal registers which are designed to be
reprogrammable to set the resistance, and;
3) cannot be modified by the end user of the equipment.
NOTE Requirements for components which read from memory during initialization are under consideration for the
next edition of IEC 60079-11.
– 2 – IEC 60079-11:2023 © IEC 2023
CONTENTS
FOREWORD . 10
1 Scope . 23
2 Normative references . 30
3 Terms, definitions and abbreviated terms . 31
3.1 Terms and definitions . 31
3.2 Abbreviated terms . 35
4 Equipment grouping, classification and Levels of Protection of apparatus . 35
5 Ignition compliance requirements . 36
5.1 General . 36
5.2 Conditions for assessment . 36
5.2.1 General . 36
5.2.2 Level of Protection "ia" . 37
5.2.3 Level of Protection "ib" . 38
5.2.4 Level of Protection "ic". 38
5.2.5 Non-shock hazard equipment or systems . 39
5.3 Spark ignition compliance . 39
5.3.1 General . 39
5.3.2 Levels of Protection "ia" and "ib" . 40
5.3.3 Level of Protection "ic". 40
5.3.4 Application of safety factors . 41
5.3.5 Circuits without controlled semiconductor limitation . 41
5.3.6 Circuits with controlled semiconductor limitation . 42
5.4 Thermal ignition compliance . 43
5.4.1 General . 43
5.4.2 Temperature of small components for Group I and Group II . 43
5.4.3 Wiring within intrinsically safe apparatus for Group I and Group II . 43
5.4.4 PCB tracks for Group I and Group II . 45
5.4.5 Intrinsically safe apparatus and component temperature for dusts . 48
5.5 Simple apparatus . 48
6 Apparatus construction . 49
6.1 General . 49
6.2 Enclosures . 49
6.2.1 General . 49
6.2.2 Apparatus complying with Table 7 . 50
6.2.3 Apparatus complying with Table 8 or Table 9 . 50
6.2.4 Enclosures for Group IIIC intrinsically safe apparatus . 50
6.2.5 Protection of separations . 50
6.3 Connection facilities for external circuits . 51
6.3.1 Terminals . 51
6.3.2 Earth Terminals . 53
6.3.3 Plugs and sockets . 53
6.3.4 Permanently connected cable . 53
6.3.5 Connections and accessories for intrinsically safe apparatus for use in
non-hazardous area . 54
6.4 Internal connections and connectors . 55
6.4.1 General . 55
6.4.2 Infallible connections . 55
IEC 60079-11:2023 © IEC 2023 – 3 –
6.4.3 Connectors for internal connections, plug-in cards and components . 57
6.4.4 Earth conductors and connections . 57
6.5 Separation of conductive parts . 58
6.5.1 Separations on which intrinsic safety depends . 58
6.5.2 Separation distances according to Table 7. 58
6.5.3 Reduced separation distances . 59
6.5.4 Failure of separations . 59
6.5.5 Voltage between conductive parts . 65
6.5.6 Types of separation . 65
6.5.7 Composite separations . 72
6.5.8 Printed circuit board assemblies . 73
6.5.9 Separation by metal parts . 75
6.5.10 Separation by non-metallic insulating partitions . 75
6.5.11 Insulation of internal wiring . 76
6.6 Encapsulation . 76
6.6.1 General . 76
6.6.2 Encapsulation used for the exclusion of explosive atmospheres . 77
6.6.3 Mechanical protection to avoid access to parts . 80
6.6.4 Encapsulation used for protection of a fuse . 81
6.6.5 Encapsulation used to provide separation . 81
6.6.6 Encapsulation used to enhance the rating of protective components . 81
6.6.7 Free space within the encapsulation . 81
6.7 Specification of coating, encapsulation materials . 83
6.8 Protection against polarity reversal . 83
6.9 Dielectric strength requirement . 83
7 Characteristics and failure of components and assemblies . 84
7.1 Rating of components on which intrinsic safety depends . 84
7.2 Failure of components . 84
7.3 Manufacturing variation . 84
7.4 Resistors . 85
7.4.1 General . 85
7.4.2 Resistors on which intrinsic safety depends . 85
7.5 Capacitors . 86
7.5.1 General . 86
7.5.2 Capacitors on which intrinsic safety depends . 86
7.5.3 Blocking capacitors . 87
7.5.4 Infallible filter capacitors . 87
7.6 Inductors and windings . 88
7.6.1 General . 88
7.6.2 Inductors on which intrinsic safety depends . 88
7.6.3 Infallibly insulated inductors . 88
7.6.4 Damping windings . 89
7.6.5 Common mode choke coils (EMI suppression filters) . 89
7.7 Semiconductors . 90
7.7.1 Failure of semiconductors . 90
7.7.2 Semiconductors on which intrinsic safety depends . 91
7.7.3 Transient effects on semiconductors on which intrinsic safety depends . 91
7.7.4 Semiconductors in shunt voltage limiters . 91
7.7.5 Shunt assembly on which intrinsic safety depends . 92
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7.7.6 Safety assemblies infallible against failure to limit voltage . 92
7.7.7 Semiconductor current limiters . 92
7.7.8 Use of programmable components . 92
7.8 Transformers . 93
7.8.1 General . 93
7.8.2 Transformers on which intrinsic safety depends . 93
7.8.3 Construction of transformers on which intrinsic safety depends . 93
7.8.4 Protective measures for transformers on which intrinsic safety depends
for Levels of Protection "ia" and "ib" . 94
7.8.5 Requirements for transformers for Level of Protection "ic" . 95
7.9 Relays . 95
7.9.1 General . 95
7.9.2 Relays on which intrinsic safety depends . 96
7.10 Signal isolators . 97
7.10.1 General . 97
7.10.2 Signal isolators on which intrinsic safety depends . 97
7.10.3 Signal isolators between intrinsically safe and non-intrinsically safe
circuits . 98
7.10.4 Signal isolators between separate intrinsically safe circuits . 98
7.11 Fuses. 98
7.12 Primary and secondary cells and batteries . 100
7.12.1 General . 100
7.12.2 Construction of cells and batteries used in intrinsically safe apparatus . 100
7.12.3 Electrolyte leakage . 101
7.12.4 Ventilation . 101
7.12.5 Cell voltages . 101
7.12.6 Batteries in equipment protected by different Types of Protection . 102
7.12.7 Batteries used and replaced in explosive atmospheres . 102
7.12.8 Replaceable batteries used but not replaced in explosive atmospheres . 102
7.12.9 External contacts for charging batteries . 102
7.13 Piezoelectric devices . 102
7.14 Cells for the detection of gases . 103
7.14.1 Electrochemical . 103
7.14.2 Catalytic . 103
7.15 Supercapacitors . 103
7.16 Thermal devices . 104
7.16.1 General . 104
7.16.2 Thermal devices used to limit temperature . 104
7.16.3 PPTC devices used to limit current . 105
7.17 Mechanical switches . 106
8 Supplementary requirements for specific apparatus . 106
8.1 Diode safety barriers . 106
8.1.1 General . 106
8.1.2 Construction . 106
8.2 FISCO apparatus . 106
9 Type verifications and type tests. 107
9.1 Spark ignition test . 107
9.1.1 General . 107
9.1.2 Spark test apparatus and its use . 107
IEC 60079-11:2023 © IEC 2023 – 5 –
9.1.3 Test gas mixtures and spark test apparatus calibration current . 108
9.2 Spark ignition assessment using reference curves and tables . 109
9.2.1 General . 109
9.2.2 Assessment of simple resistive circuit . 109
9.2.3 Assessment of simple capacitive circuits . 110
9.2.4 Assessment of Simple Inductive Circuits . 112
9.2.5 Determination of L /R for resistance limited power source . 113
o o
9.2.6 Circuits with both inductance and capacitance . 114
9.3 Temperature tests . 114
9.4 Mechanical tests . 115
9.4.1 Casting compound . 115
9.4.2 Acceptability of encapsulated or coated fuses. 115
9.4.3 Partitions . 116
9.4.4 Cable pull test . 116
9.5 Current carrying capacity of infallible printed circuit board connections . 116
9.6 Dielectric strength tests . 116
9.7 Qualification of solid insulation and distance through casting compound for
application of reduced separations . 116
9.7.1 General . 116
9.7.2 Preconditioning . 117
9.7.3 AC power frequency voltage test . 117
9.7.4 Partial discharge test . 118
9.8 Type tests for PCB coatings . 119
9.9 Differential Leakage current tests for signal isolators . 119
9.10 Isolator tests . 120
9.10.1 General . 120
9.10.2 Thermal conditioning and dielectric test . 120
9.10.3 Dielectric and short circuit test . 121
9.11 Tests for intrinsically safe apparatus containing piezoelectric devices . 122
9.12 Tests for PTC devices . 122
9.13 Determination of parameters of loosely specified components . 123
9.14 Tests for cells, batteries and supercapacitors . 123
9.14.1 Conditions for testing . 123
9.14.2 Electrolyte leakage test for cells, batteries and supercapacitors . 124
9.14.3 Spark ignition and surface temperature of cells, batteries or
supercapacitors . 125
9.14.4 Battery container pressure tests . 126
9.14.5 Battery resistance . 126
9.15 Determination of storable energy in common mode chokes . 126
9.16 Type tests for components protected by time dependent current limitation . 128
9.17 Transformer tests . 129
9.17.1 General . 129
9.17.2 Mains transformers for Level of Protection "ia" and "ib" . 130
9.17.3 Transformers galvanically isolated from the mains supply for Levels of
Protection "ia" and "ib" . 130
9.17.4 Transformers for Level of Protection "ic" . 131
10 Routine verifications and tests . 131
10.1 Alternative reduced spacings . 131
10.2 Routine tests for diode safety barriers . 131
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10.2.1 Completed barriers . 131
10.2.2 Diodes for 2-diode "ia" barriers . 131
10.3 Routine tests for transformers . 131
10.3.1 Levels of Protection "ia" and "ib" . 131
10.3.2 Level of Protection "ic". 132
10.4 Routine verification of conformal coating and encapsulation . 132
11 Marking . 133
11.1 Intrinsically safe apparatus and associated apparatus . 133
11.1.1 General . 133
11.1.2 Intrinsic safety parameters . 133
11.1.3 FISCO . 133
11.1.4 Marking of connection facilities . 134
11.1.5 Non-hazardous area accessory. 134
11.2 Warning markings . 134
12 Instructions . 135
12.1 General . 135
12.2 Specific Conditions of Use . 135
Annex A (normative) Spark ignition reference curves . 137
Annex B (normative) Spark test apparatus for intrinsically safe circuits . 161
B.1 Principle . 161
B.2 Spark test apparatus . 161
B.3 Spark test apparatus sensitivity . 162
B.4 Preparation and cleaning of tungsten wires . 162
B.5 Conditioning a new cadmium disc . 163
B.6 Limitations of the spark test apparatus . 163
B.7 Modification of spark test apparatus for use at higher currents . 164
Annex C (informative) Measurement of creepage distances, clearances and
separation distances through casting compound and through solid insulation . 169
C.1 Clearances and separation distances through casting compound and
through solid insulation . 169
C.2 Creepage distances . 170
C.3 Examples for the application of an ambient pressure correction factor . 171
Annex D (normative) Excess transient energy test . 174
D.1 Overview. 174
D.2 Circuit configuration . 175
D.3 Test equipment . 176
D.4 Test load . 177
D.5 Supply voltage . 177
D.6 Supply change tests . 177
D.7 Load change tests. 178
D.8 Transient energy calculation . 178
Annex E (normative) FISCO – Apparatus requirements . 180
E.1 Overview. 180
E.2 Apparatus requirements . 180
E.2.1 General . 180
E.2.2 FISCO power supplies . 180
E.3 FISCO field devices . 181
E.3.1 General . 181
IEC 60079-11:2023 © IEC 2023 – 7 –
E.3.2 Additional requirements of "ia" and "ib" FISCO field devices . 182
E.3.3 Additional requirement of "ic" FISCO field devices . 182
E.3.4 Terminator . 182
E.3.5 Simple apparatus . 182
Annex F (normative) Ignition testing of semiconductor limiting power supply circuits . 184
F.1 Overview. 184
F.2 Initial test .
...
SIST EN IEC 60079-11:2025 표준은 폭발성 분위기에서 사용할 수 있는 고유 안전 "i" 장비의 설계 및 시험을 지정합니다. 이 표준은 전기 회로 자체가 주변의 폭발성 분위기를 점화할 수 없는 전기 장비에 적용됩니다. 이러한 폭발성 환경에서 전기 회로의 고유 안전성은 전기 장비의 설계 및 구조에 따라 달라질 수 있으며, 이 표준은 그러한 환경에서 안전한 사용을 위해 필요한 감사를 제공합니다. 이 표준의 주요 강점 중 하나는 다양한 전기 장비에 적응할 수 있는 폭넓은 범위를 제공한다는 점입니다. 고유 안전 회로에 연결된 센서와 같은 장비에 대한 요구 사항이 포함되어 있으며, 표준은 일반적으로 "장비"라 표현되는 모든 전기 장비에 적용될 수 있습니다. 또한, 이 표준은 IEC 60079-0의 일반 요구 사항을 보완하고 수정하며, 두 표준 간의 충돌 시 SIST EN IEC 60079-11:2025의 요구 사항이 우선적으로 적용됩니다. 또한, 폭발성 분위기 외부에 위치한 전기 장비 또는 IEC 60079-0에 명시된 다른 보호 유형에 의해 보호되는 전기 장비에도 적용 가능하다는 점은 이 표준의 또 다른 장점입니다. 이는 고유 안전 회로가 폭발성 환경에서의 안전성을 보장하는 데 필수적인 요소입니다. 더불어 이 표준은 낮은 대기 압력에서의 사용에 대한 추가 요구 사항도 포함하고 있어, 다양한 환경에서의 안전성을 높이는 데 기여합니다. 이러한 점에서 SIST EN IEC 60079-11:2025는 폭발성 분위기에서 전기 장비의 안전한 운용을 보장하는 데 있어 매우 중요한 문서입니다.
Die Norm SIST EN IEC 60079-11:2025 behandelt die Konstruktion und Prüfung von intrinsisch sicheren Geräten, die für den Einsatz in explosiven Atmosphären bestimmt sind, sowie von zugehörigen Geräten, die für den Anschluss an intrinsisch sichere Schaltungen in solchen Atmosphären vorgesehen sind. Dieser spezifische Abschnitt der IEC 60079 legt den Fokus auf die Sicherheit elektrischer Geräte, die so konzipiert sind, dass ihre elektrischen Schaltungen keine Zündung einer umgebenden explosiven Atmosphäre verursachen können. Ein herausragendes Merkmal dieser Norm ist ihre Anwendbarkeit auf elektrische Ausrüstungen, bei denen die intrinsische Sicherheit der elektrischen Schaltungen abhängig von der Konstruktion und dem Design solcher elektrischen Geräte ist. Dies umfasst beispielsweise Geräte, die nur unter bestimmten Bedingungen intrinsisch sicher sind, wie bei Batteriebetrieb ohne angeschlossenen Stromnetz. Der Standard geht darüber hinaus und umfasst auch Geräte, die außerhalb der explosiven Atmosphäre positioniert sind oder durch einen anderen in IEC 60079-0 aufgeführten Schutztyp geschützt sind. Des Weiteren bietet die Norm wichtige Richtlinien für Sensoren, die an intrinsisch sichere Schaltungen angeschlossen sind, und grenzt gleichzeitig den Anwendungsbereich klar ab, indem sie angibt, dass der Schutz von katalytischen Elementen für Gruppen IIC oder IIB + H2 nicht abgedeckt ist. Die Anforderungen für intrinsisch sichere Systeme sind in IEC 60079-25 festgelegt, wodurch eine klare Verknüpfung zu anderen relevanten Normen gewährleistet wird. Die Norm ergänzt die allgemeinen Anforderungen von IEC 60079-0 und stellt sicher, dass die spezifischen Anforderungen, wo sie in Konflikt stehen, Vorrang haben. Dies stellt einen bedeutenden Vorteil dar, da es eine eindeutige Anwendung der Sicherheitsstandards sicherstellt und Missverständnisse während der Implementierung minimiert. Die Verwendung des Begriffs "Ausrüstung", der sich durchgehend auf elektrische Geräte bezieht, unterstreicht den klaren Fokus der Norm auf elektrische Sicherheit. Ein zusätzlicher Gesichtspunkt der Norm ist die Berücksichtigung der atmosphärischen Bedingungen gemäß IEC 60079-0, wobei die zusätzlichen Anforderungen für den Einsatz bei niedrigeren atmosphärischen Drücken von 60 kPa (0,6 bar) bis 110 kPa (1,1 bar) die Relevanz der Norm in einer Vielzahl von Industrieanwendungen steigern. Insgesamt ist die SIST EN IEC 60079-11:2025 eine wesentliche Norm für die Gewährleistung der Sicherheit elektrischer Ausrüstungen in potenziell explosiven Umgebungen. Ihre umfangreiche Abdeckung, die klare Strukturierung der Anforderungen und die Präferenzregelungen bei gegebenen Konflikten machen sie zu einer unverzichtbaren Referenz für alle Fachleute in der Branche.
SIST EN IEC 60079-11:2025は、爆発性雰囲気における内因性安全技術に基づく機器の保護に関する標準であり、その適用範囲は非常に広い。特に、爆発性雰囲気内で使用される内因性安全装置の構造と試験について詳細に規定しており、関連機器が内因性安全回路に接続されることを意図している点が特徴的である。 この標準の強みは、内因性安全保護がどのように機能するかを明確に示していることであり、特に電気回路が爆発性雰囲気を引き起こさない能力に焦点を当てている。電源が外部からの電力供給を受けていない状態での内因性安全性が求められる場合など、特定の条件下での耐性に関する要件も明記している。 さらに、爆発性雰囲気外に位置する、またはIEC 60079-0において別の保護タイプによって保護される電気機器に関する条件も明確にしており、より一層の安全性を確保するための設計ガイドラインを提供している。この点により、標準は電気回路のデザインと構造に対する妥当性を評価する基準として機能する。 また、この標準はIEC 60079-0の一般要件を補完・修正するものであり、異なる要件が対立した場合には、こちらの要件が優先されることを明示している。これにより、内因性安全装置及び関連装置に関する要件の一貫性が保たれている。 この標準は、IEC 60079-0の大気条件に基づいており、60 kPa（0.6バール）から110 kPa（1.1バール）の低気圧条件での使用に対する追加要件も含まれている。この柔軟性は、さまざまな環境条件下での適用が可能であることを示しており、内因性安全技術の重要性が強調されている。 総じて、SIST EN IEC 60079-11:2025は、爆発性雰囲気における電気機器の内因性安全を確保するための重要な標準であり、その包括的な範囲、強固な基準、及び安全性確保のための実用的な指針により、業界での関連性は非常に高い。
La norme SIST EN IEC 60079-11:2025 traite de la protection des équipements contre les atmosphères explosives par l'intermédiaire de la sécurité intrinsèque "i". Son champ d'application se concentre sur la construction et les tests d'appareils intrinsèquement sûrs, spécifiques aux environnements susceptibles de comporter des atmosphères explosives. Elle s'applique également aux équipements associés destinés à être connectés à des circuits intrinsèquement sûrs, accentuant ainsi la sécurité dans la conception des systèmes électriques dans ces contextes critiques. L’une des grandes forces de cette norme réside dans son approche rigoureuse et systématique envers les circuits électriques, garantissant qu'ils ne peuvent pas provoquer d’ignition de l’atmosphère environnante. Cela inclut des dispositifs qui sont considérés comme intrinsèquement sûrs seulement en présence de certaines conditions, notamment lors de l'alimentation par batterie lorsque l'alimentation secteur est coupée. Cette spécificité renforce la sécurité des applications dans des zones à haut risque. De plus, la norme est pertinente non seulement pour les équipements situés directement dans des atmosphères explosives, mais aussi pour ceux localisés à l'extérieur, tenant compte du design et de la construction qui garantissent la sécurité intrinsèque des circuits électriques exposés. Ainsi, elle élargit le cadre de sécurité à un large éventail de situations pratiques, rendant son application extrêmement flexible et adaptée à diverses configurations industrielles. Il est également important de noter que la norme fournit des exigences complémentaires et modifie les exigences générales de l'IEC 60079-0, en clarifiant les interactions entre cette dernière et les spécificités de la sécurité intrinsèque. Dans les cas où des conflits surviennent entre les deux normes, SIST EN IEC 60079-11:2025 prend le pas, ce qui souligne son importance dans l'établissement de normes de sécurité claires et précises. L'application de la norme aux capteurs connectés à des circuits intrinsèquement sûrs, tout en excluant certaines protections directes, montre un équilibre judicieux entre sécurité et praticité. Par ailleurs, en tenant compte des exigences pour des pressions atmosphériques plus basses, la norme s'adapte aux évolutions technologiques et aux besoins spécifiques du marché. En résumé, la norme SIST EN IEC 60079-11:2025 est essentielle pour assurer la protection et la sécurité des équipements électriques dans des atmosphères explosives, et s'impose comme un outil fondamental pour les professionnels du secteur axés sur la sécurité intrinsèque.
The SIST EN IEC 60079-11:2025 standard significantly enhances safety protocols for equipment used in explosive atmospheres by providing a comprehensive framework for the construction and testing of intrinsically safe apparatus. Its scope is well-defined, addressing both apparatus intended for use directly in explosive atmospheres and associated equipment connected to intrinsically safe circuits. This inclusion expands its relevance to various engineering applications where explosive risks are a concern, ensuring a robust categorization of electrical equipment. One of the notable strengths of this standard is its clear emphasis on the intrinsic safety principle, which mitigates the risk of ignition under specified operational conditions. By stating that electrical circuits must be incapable of igniting a surrounding explosive atmosphere, the standard sets a high bar for safety and reliability. This is particularly important in sectors where safety is paramount, such as oil and gas, chemical processing, and mining. Moreover, the standard’s accommodation for additional types of apparatus, including those exposed to explosive atmospheres but located outside such zones, reflects an adaptable and extensive approach to safety. This is bolstered by the assurance that the design and construction of these external components can contribute to overall intrinsic safety, establishing a comprehensive safety net. The requirement for compatibility with IEC 60079-0 further strengthens this standard by ensuring that any conflicting requirements are resolved in favor of the intrinsic safety guidelines. This hierarchy of requirements is critical in simplifying compliance for manufacturers and engineers, as it guides them towards adhering to the most stringent safety standards. The focus on lower atmospheric pressures, extending the applicability of the standard to ranges from 60 kPa to 110 kPa, also highlights its relevance in varied operational environments. By including such specific atmospheric conditions, the standard lends itself to international best practices, effectively addressing the needs of global industries operating in unique settings. Additionally, the standard emphasizes the importance of assessing sensors connected to intrinsically safe circuits, although it explicitly excludes catalytic elements for Group IIC or Group IIB + H2. This specificity helps streamline compliance and focuses attention on critical aspects of safety, ensuring that users can easily navigate the applicability of the standard to their specific equipment. In summary, SIST EN IEC 60079-11:2025 presents a thorough and essential guideline for the intrinsic safety of electrical equipment in explosive atmospheres. Its strengths lie in its clarity, comprehensiveness, and adaptability, making it an indispensable reference for industry professionals dedicated to upholding the highest safety standards.
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