EN IEC 60079-26:2024

SLOVENSKI STANDARD
01-september-2024
Eksplozivne atmosfere - 26. del: Oprema z ločevalnimi elementi ali kombinirano
stopnjo zaščite (IEC 60079-26:2021)
Explosive atmospheres - Part 26: Equipment with Separation Elements or combined
Levels of Protection (IEC 60079-26:2021)
Explosionsgefährdete Bereiche - Teil 26: Betriebsmittel mit Trennelementen oder
kombinierten Zündschutzarten (IEC 60079-26:2021)
Atmosphères explosives - Partie 26: Appareil avec éléments de séparation ou niveaux
de protection combinés (IEC 60079-26:2021)
Ta slovenski standard je istoveten z: EN IEC 60079-26:2024
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 60079-26

NORME EUROPÉENNE
EUROPÄISCHE NORM April 2024
ICS 29.260.20 Supersedes EN 60079-26:2015
English Version
Explosive atmospheres - Part 26: Equipment with Separation
Elements or combined Levels of Protection
(IEC 60079-26:2021)
Atmosphères explosives - Partie 26: Appareil avec Explosionsgefährdete Bereiche - Teil 26: Betriebsmittel mit
éléments de séparation ou niveaux de protection combinés Trennelementen oder kombinierten Zündschutzarten
(IEC 60079-26:2021) (IEC 60079-26:2021)
This European Standard was approved by CENELEC on 2021-04-01. 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 60079-26:2024 E

European foreword
The text of document 31/1562/FDIS, future edition 4 of IEC 60079-26, prepared by IEC/TC 31
"Equipment for explosive atmospheres" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 60079-26:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2024-10-26
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-04-26
document have to be withdrawn
This document supersedes EN 60079-26:2015 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 60079-26:2021 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 60079-14 NOTE Approved as EN 60079-14
ISO 80079-37 NOTE Approved as EN ISO 80079-37
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 60079-1 - Explosive atmospheres - Part 1: Equipment EN 60079-1 -
protection by flameproof enclosures "d"
IEC 60079-11 - Explosive atmospheres - Part 11: EN 60079-11 -
Equipment protection by intrinsic safety "i"
IEC 60079-31 - Explosive atmospheres - Part 31: EN 60079-31 -
Equipment dust ignition protection by
enclosure "t"
IEC/TS 60079-40 - Explosive atmospheres - Part 40: - -
Requirements for process sealing between
flammable process fluids and electrical
systems
IEC 60529 - Degrees of protection provided by EN 60529 -
enclosures (IP Code)
IEC 60695-11-10 - Fire hazard testing - Part 11-10: Test EN 60695-11-10 -
flames - 50 W horizontal and vertical flame
test methods
ISO 80079-36 - Explosive atmospheres - Part 36: Non- EN ISO 80079-36 -
electrical equipment for explosive
atmospheres - Basic method and
requirements
IEC 60079-26 ®
Edition 4.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Explosive atmospheres –
Part 26: Equipment with Separation Elements or combined Levels of Protection

Atmosphères explosives –
Partie 26: Appareil avec éléments de séparation ou niveaux de protection

combinés
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-9390-4

– 2 – IEC 60079-26:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Ex Equipment with two combined Types of Protection . 8
4.1 General . 8
4.2 Basic requirements . 8
4.3 Electrical Connections . 9
5 Ex Equipment containing parts with different EPLs and a separation element . 9
5.1 General . 9
5.2 Separation elements . 9
5.2.1 General . 9
5.2.2 Basic requirements . 10
5.2.3 Mechanical partition walls . 10
5.2.4 Metallic partition walls with gas-tight conductor bushings . 10
5.2.5 Partition wall supplemented with a joint . 11
5.2.6 Partition wall for explosive gas atmospheres supplemented with natural
ventilation . 11
5.2.7 Requirements depending on the thickness of the partition wall . 12
6 Process connection . 13
7 Type tests . 14
7.1 Standardized Types of Protection . 14
7.2 Separation elements . 14
7.3 Temperature evaluation . 14
8 Marking . 14
8.1 General . 14
8.2 Ex Equipment with two combined Types of Protection . 14
8.3 Ex Equipment containing parts with different EPLs. 15
8.4 Examples of marking:. 15
9 Instructions . 16
9.1 Separation elements . 16
9.2 Process connection . 16
9.3 EPL allocation . 16
Annex A (normative)  Types of construction for separation elements . 17
Bibliography . 23

Figure 1 – Partition wall with a conductor bushing considered as gas diffusion tight. 11
Figure 2 – Example of a separation element with a cylindrical shaft joint and ventilation . 12
Figure 3 – Example g) of marking of equipment with a separation element. 15

Table 1 – Requirements for Ex Equipment containing parts with different EPLs. . 9
Table A.1 – Ex Equipment with separation elements mounted at a boundary of Zone 0. 17
Table A.2 – Ex Equipment with separation elements mounted at a boundary of Zone 1. 18
Table A.3 – Ex Equipment with separation elements mounted at a boundary of Zone 20 . 19
Table A.4 – Ex Equipment with separation elements mounted at a boundary of Zone 21 . 19

IEC 60079-26:2021 © IEC 2021 – 3 –
Table A.5 – Ex Equipment with separation elements mounted at a boundary of Zone 0
in Zone 21 or 22 . 20
Table A.6 – Ex Equipment with separation elements mounted at a boundary of Zone 1
in Zone 21 or 22 . 20
Table A.7 – Ex Equipment with separation elements mounted at a boundary of Zone 20
in Zone 1 or 2 . 21
Table A.8 – Ex Equipment with separation elements mounted at a boundary of Zone 21
in Zone 1 or 2 . 22

– 4 – IEC 60079-26:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 26: Equipment with Separation Elements
or combined Levels of Protection

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 parti
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