IEC 60079-26:2014
(Main)Explosive atmospheres - Part 26: Equipment with Equipment Protection Level (EPL) Ga
Explosive atmospheres - Part 26: Equipment with Equipment Protection Level (EPL) Ga
IEC 60079-26:2014 specifies alternative requirements for construction, test and marking for electrical equipment that provides Equipment Protection Level (EPL) Ga when single standardised Types of Protection (e.g. Ex "ia", Ex "ma", Ex "da") cannot be applied. This standard also applies to equipment mounted across a boundary where different Equipment Protection Levels may be required. This electrical equipment, within the operational parameters specified by the manufacturer, ensures a very high Level of Protection that includes rare malfunctions related to the equipment or two malfunctions occurring independently of each other. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence. This third edition cancels and replaces the second edition published in 2006 and constitutes a technical revision. The numerous changes are identified in the Foreword of the document. Keywords: Equipment Protection Level (EPL) Ga
Atmosphères explosives - Partie 26: Matériel d'un niveau de protection du matériel (EPL) Ga
IEC 60079-26:2014 spécifie les exigences alternatives relatives à la construction, aux essais et au marquage du matériel électrique fournissant le niveau de protection du matériel (EPL, Equipment Protection Level) Ga lorsque des types normalisés uniques de Protection (comme par ex. Ex "ia", Ex "ma", Ex "da") ne peuvent pas être appliqués. La présente norme s'applique au matériel installé en chevauchement sur des emplacements pour lesquels différents niveaux de protection du matériel peuvent être exigés.Ce matériel électrique assure, dans les limites des paramètres de fonctionnement spécifiés par le constructeur, un très haut niveau de protection prenant en compte le cas de rares dysfonctionnements liés au matériel, ou d'apparition simultanée de deux dysfonctionnements indépendants l'un de l'autre. La présente norme complète et modifie les exigences générales de l'IEC 60079-0. Lorsqu'une exigence de la présente norme entre en contradiction avec une exigence de l'IEC 60079-0, l'exigence de la présente norme prévaut. Cette troisième édition annule et remplace la deuxième édition parue en 2006 et constitue une révision technique. Les nombreux changements sont identifiés dans l'avant-propos du document. Mots clés: protection du matériel (EPL) Ga
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IEC 60079-26 ®
Edition 3.0 2014-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 26: Equipment with Equipment Protection Level (EPL) Ga
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
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IEC 60079-26 ®
Edition 3.0 2014-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 26: Equipment with Equipment Protection Level (EPL) Ga
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-1912-6
– 2 – IEC 60079-26:2014 RLV © IEC 2014
CONTENTS
FOREWORD . 4
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 8
4 Requirements for design and construction . 8
4.1 General .
4.1 Protection measures against ignition hazards of the electrical circuits. 8
4.1.1 General . 8
4.2.2 Intrinsic safety as a sole means of protection.
4.2.3 Encapsulation as a sole means of protection .
4.1.2 Application of two independent Types of Protection providing EPL Gb . 9
4.1.3 Application of a Type of Protection providing EPL Gb and a separation
element . 10
4.2 Equipment with moving parts . 14
4.2.1 Frictional heating . 14
4.2.2 Damage arising from failure of moving parts . 14
4.2.3 Light metals . 15
4.4 Isolated conductive components .
4.5 Non-conductive enclosures and accessible non-conductive components .
4.5.1 General .
4.5.2 Limitation of the size of chargeable non-conductive surfaces .
4.5.3 Limitation of the thickness of chargeable non-conductive layers .
4.5.4 Provision of a conductive coating.
4.3 Process connection . 16
5 Type tests . 16
5.1 Standardized types of protection . 16
5.2 Separation elements . 17
5.3 Temperature evaluation . 17
6 Marking . 17
6.1 General . 17
6.2 Examples of marking . 17
7 Information for use .
7 Instructions . 18
7.1 Separation elements: . 18
7.2 Process connection: . 18
7.3 EPL allocation . 18
Annex A (informative) Introduction of an alternative risk assessment method
encompassing “equipment protection levels” for Ex equipment .
Bibliography . 23
Figure 1 – Example of a 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
naturalventilation . 14
Table 1 – Separation elements . 13
– 4 – IEC 60079-26:2014 RLV © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 26: Equipment with Equipment Protection Level
(EPL) Ga
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 participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
International Standard IEC 60079-26 has been prepared by IEC technical committee 31:
Equipment for explosive atmospheres.
This third edition cancels and replaces the second edition published in 2006 and constitutes a
technical revision.
This edition includes the following significant changes with respect to the previous edition:
Type
Changes Clause Minor and Extension Major
editorial technical
changes changes
Notes deleted 1 X
Reference to associated apparatus deleted 1 X
Additional normative references included 3 X
Requirements against mechanical and
electrostatic ignition hazards deleted (now 4.1 X
covered in IEC 60079-0)
Requirement for separation element detailed
4.1.3.2 X
regarding external influences
Intrinsic safety Ex ia as single type of protection
4.2.2
including associated apparatus deleted (now X
(ed.2)
covered by EPL)
Encapsulation Ex ma as single type of protection 4.2.3
X
deleted (now covered by EPL) (ed.2)
Conditions a) and b) linked with an “and” ,
therefore requirement of “flameproof joint” deleted
in following clause. Both requirements already 4.3 X
covered by separation elements and standardised
process connections.
Process connection requires a sufficiently tight
4.3 X
joint: IP66 added alternatively to IP67
Requirement for isolated conductive components 4.4
X
deleted (now covered in IEC 60079-0) (ed.2)
Requirements for non-conductive enclosures 4.5
X
deleted (now covered in IEC 60079-0) (ed.2)
Test of partition walls according to 4.1.3.2 b) is
5.2 C1
specified in more detail
Marking example for associated apparatus deleted 6.2 b) X
Note 3 with an additional example added 6.2 X
Specification of material of partition wall required
7 X
in instructions (also required in 4.1.3.2)
Alternative risk assessment method deleted (is AnnexA
X
now generally introduced) (ed.2)
NOTE The technical changes referred to include the significance of technical changes in the revised IEC
Stand
...
IEC 60079-26 ®
Edition 3.0 2014-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 26: Equipment with Equipment Protection Level (EPL) Ga
Atmosphères explosives –
Partie 26: Matériel d'un niveau de protection du matériel (EPL) Ga
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 14
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.
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The advanced search enables to find IEC publications by a More than 55 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,
77, 86 and CISPR.
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IEC 60079-26 ®
Edition 3.0 2014-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 26: Equipment with Equipment Protection Level (EPL) Ga
Atmosphères explosives –
Partie 26: Matériel d'un niveau de protection du matériel (EPL) Ga
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX Q
ICS 29.260.20 ISBN 978-2-8322-1903-4
– 2 – IEC 60079-26:2014 © IEC 2014
CONTENTS
FOREWORD . 3
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 7
4 Requirements for design and construction . 7
4.1 Protection measures against ignition hazards of the electrical circuits . 7
4.1.1 General . 7
4.1.2 Application of two independent Types of Protection providing EPL Gb . 7
4.1.3 Application of a Type of Protection providing EPL Gb and a separation
element . 8
4.2 Equipment with moving parts . 12
4.2.1 Frictional heating . 12
4.2.2 Damage arising from failure of moving parts . 12
4.2.3 Light metals . 12
4.3 Process connection . 13
5 Type tests . 13
5.1 Standardized types of protection . 13
5.2 Separation elements . 13
5.3 Temperature evaluation . 13
6 Marking . 14
6.1 General . 14
6.2 Examples of marking . 14
7 Instructions. 14
7.1 Separation elements: . 14
7.2 Process connection: . 15
7.3 EPL allocation . 15
Bibliography . 16
Figure 1 – Example of a partition wall with a conductor bushing considered as gas
diffusion tight . 9
Figure 2 – Example of a separation element with a cylindrical shaft joint and
naturalventilation . 12
Table 1 – Separation elements . 11
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 26: Equipment with Equipment Protection Level
(EPL) Ga
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 participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60079-26 has been prepared by IEC technical committee 31:
Equipment for explosive atmospheres.
This third edition cancels and replaces the second edition published in 2006 and constitutes a
technical revision.
– 4 – IEC 60079-26:2014 © IEC 2014
This edition includes the following significant changes with respect to the previous edition:
Type
Changes Clause Minor and Extension Major
editorial technical
changes changes
Notes deleted 1 X
Reference to associated apparatus deleted 1 X
Additional normative references included 3 X
Requirements against mechanical and
electrostatic ignition hazards deleted (now 4.1 X
covered in IEC 60079-0)
Requirement for separation element detailed
4.1.3.2 X
regarding external influences
Intrinsic safety Ex ia as single type of protection
4.2.2
including associat
...
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