EN 60079-26:2007

SLOVENSKI STANDARD
01-november-2007
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SIST EN 60079-26:2005
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Explosive atmospheres - Part 26: Equipment with equipment protection level (EPL) Ga
Explosionsfhige Atmosphre - Teil 26: Betriebsmittel mit Gerteschutzniveau (EPL) Ga
Atmosphres explosives - Partie 26: Matriel d'un niveau de protection du matriel (EPL) Ga
Ta slovenski standard je istoveten z: EN 60079-26:2007
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60079-26
NORME EUROPÉENNE
March 2007
EUROPÄISCHE NORM
ICS 29.260.20 Supersedes EN 60079-26:2004

English version
Explosive atmospheres -
Part 26: Equipment with equipment protection level (EPL) Ga
(IEC 60079-26:2006)
Atmosphères explosives -  Explosionsfähige Atmosphäre -
Partie 26: Matériel d'un niveau Teil 26: Betriebsmittel
de protection du matériel (EPL) Ga mit Geräteschutzniveau (EPL) Ga
(CEI 60079-26:2006) (IEC 60079-26:2006)

This European Standard was approved by CENELEC on 2006-10-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-26:2007 E
Foreword
The text of document 31/630/FDIS, future edition 2 of IEC 60079-26, prepared by IEC TC 31, Equipment
for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60079-26 on 2006-10-01.
This European Standard supersedes EN 60079-26:2004.
The significant changes with respect to EN 60079-26:2004 are:
– changes concerning the accessible chargeable surfaces of the equipment;
– requirements of a partition wall combined with an air-gap with natural ventilation;
– introduction of equipment protection levels (EPL) and substitution of the references to zones (see
explanation in Annex A);
– change of heading from “Mechanical connection” to “Process connection” together with a clarification
of requirement for any release from Zone 0 of explosive gas atmospheres.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-10-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-10-01
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directive 94/9/EC. See Annex ZZ.
This European Standard covers Category 1G and combined Category 1/2G electrical equipment.
NOTE Other EC Directives may be applicable
To be in line with the requirements given in Directive 94/9/EC the text given in the body of the standard
should be interpreted as given in the following table.
Text given in EN 60079-26 Adaptation to Directive 94/9/EC
Part 26: Equipment with equipment protection Part 26: Construction, test and marking of
level (EPL) Ga Group II Category 1G electrical equipment
EPL Ga equipment Category 1G equipment
EPL Gb type of protection Category 2G type of protection
Instead of the marking requirements given in Clause 6 of this standard, the apparatus shall be marked
according to the requirements of the Directive 94/9/EC for equipment Group II, Category 1G.
Apparatus intended for installation in the boundary wall between areas requiring different categories shall
have both categories marked on the label separated by a “/” (see examples below). Additionally, the
apparatus shall be marked according to the type of protection as defined in Clause 6.

- 3 - EN 60079-26:2007
Examples of marking in compliance with Directive 94/9/EC
a) Apparatus which is intended to be completely installed inside the Zone 0 area for example:
II 1G
b) Associated apparatus, which is installed outside the hazardous area and providing external electrical
circuits protected by intrinsic safety “ia” according to EN 60079-11, which can be connected to
Category 1 apparatus , for example:
II (1)G
NOTE  No designation of the temperature class is required, as this apparatus is located outside the hazardous area.
c) Equipment which is installed in the boundary wall between areas requiring different categories, both
categories are marked on the label separated by a slash for example:
II 1/2G
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60079-26:2006 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 standards indicated:
IEC 60079-2 NOTE  Harmonized as EN 60079-2:2004 (not modified).
IEC 60079-7 NOTE  Harmonized as EN 60079-7:2007 (not modified).
IEC 60079-14 NOTE  Harmonized as EN 60079-14:2003 (not modified).
IEC 60079-15 NOTE  Harmonized as EN 60079-15:2005 (not modified).
IEC 60079-26 NOTE  Harmonized as EN 60079-26:2004 (not modified).
IEC 60079-28 NOTE  Harmonized as EN 60079-28:2007 (not modified).
IEC 60529 NOTE  Harmonized as EN 60529:1991 (not modified).
IEC 61241-0 NOTE  Harmonized as EN 61241-0:2006 (modified).
IEC 61241-4 NOTE  Harmonized as EN 61241-4:2006 (not modified).
IEC 61241-10 NOTE  Harmonized as EN 61241-10:2004 (not modified).
IEC 61241-11 NOTE  Harmonized as EN 61241-11:2006 (not modified).
IEC 61241-18 NOTE  Harmonized as EN 61241-18:2004 (not modified).
__________
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60079-0 (mod) 2004 Electrical apparatus for explosive gas EN 60079-0 2006
atmospheres -
Part 0: General requirements
1) 2)
IEC 60079-1 - Electrical apparatus for explosive gas EN 60079-1 2004
atmospheres - + corr. April 2006
Part 1: Flameproof enclosures 'd'

1) 2)
IEC 60079-10 - Electrical apparatus for explosive gas EN 60079-10 2003
atmospheres -
Part 10: Classification of hazardous areas

1) 2)
IEC 60079-11 - Explosive atmospheres - EN 60079-11 2006
Part 11: Equipment protection by intrinsic
safety "i"
1) 2)
IEC 60079-18 - Electrical apparatus for explosive gas EN 60079-18 2004
atmospheres - + corr. April 2006
Part 18: Construction, test and marking of
type of protection encapsulation "m"
electrical apparatus
1) 2)
IEC 60695-11-10 - Fire hazard testing - EN 60695-11-10 1999
Part 11-10: Test flames - 50 W horizontal
and vertical flame test methods

1)
Undated reference.
2)
Valid edition at date of issue.

- 5 - EN 60079-26:2007
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers only the
following essential requirements out of those given in Annex II of the EC Directive 94/9/EC:
– ER 1.0.1 to ER 1.0.4, ER 1.0.5 (partly), ER 1.0.6 (partly)
– ER 1.1
– ER 1.2.1 (partly), ER 1.2.3, ER 1.2.5 (partly), ER 1.2.8, ER 1.2.9
– ER 1.3.1 (partly), ER 1.3.2 (partly), ER 1.3.3 (partly), ER 1.3.14 (partly)
– ER 1.4.2 (partly)
– ER 2.1.1.1, ER 2.1.1.2
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directive concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.
__________
NORME CEI
INTERNATIONALE
IEC
60079-26
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2006-08
Atmosphères explosives –
Partie 26:
Matériel d'un niveau de protection
du matériel (EPL) Ga
Explosive atmospheres –
Part 26:
Equipment with equipment protection
level (EPL) Ga
 IEC 2006 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

60079-26  IEC:2006 – 3 –
CONTENTS
FOREWORD.5

1 Scope.9
2 Normative references.11
3 Terms and definitions .11
4 Requirements for design and construction.11
4.1 General .11
4.2 Protection measures against ignition hazards of the electrical circuits .11
4.3 Equipment with moving parts .23
4.4 Isolated conductive components .23
4.5 Non-conductive enclosures and accessible non-conductive components .25
4.6 Process connection .27
5 Type tests.27
5.1 Standardized types of protection .27
5.2 Separation elements.27
5.3 Temperature evaluation .27
6 Marking .29
6.1 General .29
6.2 Examples of marking .29
7 Information for use.29

Annex A (informative) Introduction of an alternative risk assessment method
encompassing “equipment protection levels” for Ex equipment .31

Bibliography .41

Figure 1 – Example of a partition wall with a conductor bushing being considered gas
diffusion tight .17
Figure 2 – Example of a separation element with a cylindrical shaft joint and natural
ventilation .23

Table 1 – Separation elements .19
Table A.1 – Traditional relationship of EPLs to zones (no additional risk assessment).35
Table A.2 – Description of risk of ignition protection provided .37

60079-26  IEC:2006 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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EXPLOSIVE ATMOSPHERES –
Part 26: Equipment with
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