IEC 60079-6:2015
(Main)Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o"
Explosive atmospheres - Part 6: Equipment protection by liquid immersion "o"
IEC 60079-6:2015 specifies the requirements for the design, construction, testing and marking of Ex Equipment and Ex Components with type of protection liquid immersion "o" intended for use in explosive gas atmospheres. Ex Equipment and Ex Components of type of protection liquid immersion "o" are either:
- Level of Protection "ob" (EPL "Mb" or "Gb") or
- Level of Protection "oc" (EPL "Gc"). For Level of Protection "ob", this standard applies where the rated voltage does not exceed 11 kV r.m.s. a.c. or d.c. For Level of Protection "oc", this standard applies where the rated voltage does not exceed 15 kV r.m.s. a.c. or d.c. 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 fourth edition cancels and replaces the third edition, published in 2007. This edition constitutes a technical revision. The significant changes with respect to the previous edition are:
- Edition 4 represents a major technical revision of the requirements for oil immersion "o" and should be considered as introducing all new requirements. The normal "Table of Significant Changes" has not been included for this reason. In particular:
- The requirements for oil immersion "o" have been redefined into liquid immersion, levels of protection "ob" and "oc" as recommended by the responses to 31/715/DC;
- The ability to protect sparking contacts has been added to both "ob" and "oc". Additional requirements have been introduced for the protective liquid. Keywords: Ex Equipment and Ex Components with type of protection liquid immersion "o"
Atmosphères explosives - Partie 6: Protection du matériel par immersion dans le liquide "o"
L'IEC 60079-6:2015 spécifie les exigences de conception, de construction, d'essais et de marquage d'un matériel Ex et de composants Ex, de mode de protection immersion dans le liquide "o", destinés à être utilisés dans des atmosphères explosives gazeuses. Un matériel Ex et des composants Ex de mode de protection immersion dans le liquide "o" peuvent être du: Niveau de Protection "ob" (EPL "Mb" ou "Gb"), ou Niveau de Protection "oc" (EPL "Gc"). Pour le Niveau de Protection "ob", la présente norme s'applique si la tension assignée est inférieure à 11 kV eff. c.a. ou c.c. Pour le Niveau de Protection "oc", la présente norme s'applique si la tension assignée est inférieure à 15 kV eff. c.a. ou c.c. 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 quatrième édition annule et remplace la troisième édition parue en 2007. Cette édition constitue une révision technique. Les modifications majeures par rapport à l'édition précédente sont énumérées ci-dessous:
- Cette quatrième édition introduit une révision technique majeure des exigences relatives à l'immersion dans l'huile "o", et il convient qu'elle soit considérée comme spécifiant de nouvelles exigences. Le "Tableau des modifications majeures" habituel n'a pas été inclus pour cette raison. En particulier:
- Les exigences relatives à l'immersion dans l'huile "o" traitent désormais de l'immersion dans un liquide, de niveaux de protection "ob" et "oc", selon les recommandations des réponses au document 31/715/DC;
- La capacité à protéger les contacts à décharge disruptive a été ajoutée aux niveaux de protection "ob" et "oc". Des exigences supplémentaires relatives au liquide de protection ont été introduites. Mots clés: matériel Ex et de composants Ex, de mode de protection immersion dans le liquide "o"
General Information
Relations
Buy Standard
Standards Content (Sample)
IEC 60079-6 ®
Edition 4.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 6: Equipment protection by liquid immersion "o"
Atmosphères explosives –
Partie 6: Protection du matériel par immersion dans le liquide "o"
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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
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.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
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 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 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.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient plus de 30 000 termes et définitions en
Spécifications techniques, Rapports techniques et autres
anglais et en français, ainsi que les termes équivalents dans
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
15 langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.
Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
La recherche avancée permet de trouver des publications IEC Plus de 60 000 entrées terminologiques électrotechniques, en
en utilisant différents critères (numéro de référence, texte, anglais et en français, extraites des articles Termes et
comité d’études,…). Elle donne aussi des informations sur les Définitions des publications IEC parues depuis 2002. Plus
projets et les publications remplacées ou retirées. certaines entrées antérieures extraites des publications des
CE 37, 77, 86 et CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished
Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
csc@iec.ch.
IEC 60079-6 ®
Edition 4.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 6: Equipment protection by liquid immersion "o"
Atmosphères explosives –
Partie 6: Protection du matériel par immersion dans le liquide "o"
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-2251-5
– 2 – IEC 60079-6:2015 © IEC 2015
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 7
4 Constructional requirements . 8
4.1 General . 8
4.2 Levels of protection and requirements of electrical equipment . 8
4.2.1 Level of Protection . 8
4.2.2 Requirements for Level of Protection “ob” . 9
4.2.3 Requirements for Level of Protection “oc” . 9
4.3 Switching device . 9
4.4 Creepage and clearance . 9
4.5 Liquid containment enclosures. 10
4.5.1 General . 10
4.5.2 Sealed enclosures . 10
4.5.3 Unsealed enclosures . 10
4.5.4 Outlet of breathing device or pressure relief device . 10
4.5.5 Enclosures intended to be opened . 10
4.5.6 Determination of the maximum/minimum criteria of the protective liquid . 10
4.6 Immersion depth . 11
4.7 Protective liquid level indication . 11
4.7.1 General . 11
4.7.2 Remote-indicating protective liquid level indicator . 12
4.7.3 Safety devices for Level of Protection “ob” . 12
4.8 Temperature limitations . 12
4.8.1 General . 12
4.8.2 Maximum Surface Temperature . 12
4.8.3 Flashpoint of the protective liquid . 12
4.9 Field wiring connections to liquid immersion equipment . 12
4.10 Constructional elements of enclosures . 12
4.10.1 Operating rods, shafts etc. . 12
4.10.2 Devices for draining of liquid . 13
5 Protective Liquid . 13
5.1 Protective liquid specification . 13
5.2 Detailed alternative specification . 13
5.3 Group I equipment . 13
5.4 Liquid contamination and gassing that may result from arcing . 13
5.5 Total volume of the protective liquid. 14
6 Verifications and tests . 14
6.1 Type tests . 14
6.1.1 Overpressure test on sealed enclosures . 14
6.1.2 Reduced pressure test on sealed enclosures . 14
6.1.3 Overpressure test on unsealed enclosures . 14
6.1.4 Maximum temperature . 14
6.1.5 Switching Tests . 15
6.2 Routine tests . 15
6.2.1 Sealed enclosures . 15
6.2.2 Unsealed enclosures . 15
7 Marking . 15
8 Instructions. 16
Annex A (normative) Selection and erection requirements . 17
Annex B (normative) Maintenance requirements . 18
Annex C (normative) Repair and Overhaul requirements . 19
Bibliography . 20
Table 1 – Working voltage . 9
Table 2 – Depth of immersion . 11
Table B.1 – Inspection requirements . 18
– 4 – IEC 60079-6:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 6: Equipment protection by liquid immersion "o"
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 s
...
IEC 60079-6 ®
Edition 4.1 2020-02
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Explosive atmospheres –
Part 6: Equipment protection by liquid immersion "o"
Atmosphères explosives –
Partie 6: Protection du matériel par immersion dans le liquide "o"
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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and definitions clause of
IEC publications issued between 2002 and 2015. Some
IEC Customer Service Centre - webstore.iec.ch/csc entries have been collected from earlier publications of IEC
If you wish to give us your feedback on this publication or TC 37, 77, 86 and CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - Electropedia - www.electropedia.org
webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au
La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en
en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire
projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.
IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary
Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais
Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et définitions des
Disponible en ligne et une fois par mois par email. publications IEC parues entre 2002 et 2015. Plus certaines
entrées antérieures extraites des publications des CE 37, 77,
Service Clients - webstore.iec.ch/csc 86 et CISPR de l'IEC.
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC 60079-6 ®
Edition 4.1 2020-02
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Explosive atmospheres –
Part 6: Equipment protection by liquid immersion "o"
Atmosphères explosives –
Partie 6: Protection du matériel par immersion dans le liquide "o"
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-7920-5
IEC 60079-6 ®
Edition 4.1 2020-02
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Explosive atmospheres –
Part 6: Equipment protection by liquid immersion "o"
Atmosphères explosives –
Partie 6: Protection du matériel par immersion dans le liquide "o"
– 2 – IEC 60079-6:2015+AMD1:2020 CSV
© IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Constructional requirements . 9
4.1 General . 9
4.2 Levels of protection and requirements of electrical equipment. 9
4.2.1 Level of Protection . 9
4.2.2 Requirements for Level of Protection “ob” . 9
4.2.3 Requirements for Level of Protection “oc” . 10
4.3 Switching device . 10
4.4 Creepage and clearance . 10
4.5 Liquid containment enclosures . 10
4.5.1 General . 10
4.5.2 Sealed enclosures . 10
4.5.3 Unsealed enclosures . 11
4.5.4 Outlet of breathing device or pressure relief device . 11
4.5.5 Enclosures intended to be opened . 11
4.5.6 Determination of the maximum/minimum criteria of the protective liquid. 11
4.6 Immersion depth . 11
4.7 Protective liquid level indication . 12
4.7.1 General . 12
4.7.2 Remote-indicating protective liquid level indicator . 12
4.7.3 Safety devices for Level of Protection “ob” . 13
4.8 Temperature limitations . 13
4.8.1 General . 13
4.8.2 Maximum Surface Temperature . 13
4.8.3 Flashpoint of the protective liquid . 13
4.9 Field wiring connections to liquid immersion equipment . 13
4.10 Constructional elements of enclosures . 13
4.10.1 Operating rods, shafts etc. . 13
4.10.2 Devices for draining of liquid. 13
5 Protective Liquid . 14
5.1 Protective liquid specification . 14
5.2 Detailed alternative specification . 14
5.3 Group I equipment . 14
5.4 Liquid contamination and gassing that may result from arcing . 14
5.5 Total volume of the protective liquid . 14
6 Verifications and tests . 15
6.1 Type tests . 15
6.1.1 Overpressure test on sealed enclosures . 15
6.1.2 Reduced pressure test on sealed enclosures . 15
6.1.3 Overpressure test on unsealed enclosures . 15
6.1.4 Maximum temperature . 15
6.1.5 Switching Tests . 15
6.2 Routine tests. 16
© IEC 2020
6.2.1 Sealed enclosures . 16
6.2.2 Unsealed enclosures . 16
7 Marking . 16
8 Instructions . 17
Annex A (normative) Selection and erection requirements . 18
Annex B (normative) Maintenance requirements . 19
Annex C (normative) Repair and Overhaul requirements . 20
Annex D (normative) Supplementary requirements for electrical equipment with Level
of Protection "oc" for voltages greater than 15 kV and up to and including 245 kV . 21
Bibliography . 24
Table 1 – Working voltage . 10
Table 2 – Depth of immersion . 12
Table B.1 – Inspection requirements . 19
– 4 – IEC 60079-6:2015+AMD1:2020 CSV
© IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 6: Equipment protection by liquid immersion "o"
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) Th
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.