IEC 60079-5:2015

IEC 60079-5 ®
Edition 4.1 2022-05
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 5: Equipment protection by powder filling "q"

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
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3, rue de Varembé info@iec.ch
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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.

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IEC 60079-5 ®
Edition 4.1 2022-05
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 5: Equipment protection by powder filling "q"
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-0347-7

IEC 60079-5 ®
Edition 4.1 2022-05
CONSOLIDATED VERSION
REDLINE VERSION
colour
inside
Explosive atmospheres –
Part 5: Equipment protection by powder filling "q"

– 2 – IEC 60079-5:2015+AMD1:2022 CSV
© IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Constructional requirements . 7
4.1 Containers . 7
4.1.1 Closing and sealing . 7
4.1.2 Pressure test of container . 8
4.1.3 Degree of protection of the container . 8
4.1.4 Filling procedure . 8
4.1.5 Containers that are not external enclosures . 8
4.2 Filling material . 9
4.2.1 Material specification . 9
4.2.2 Documentation . 9
4.2.3 Testing . 9
4.3 Distances . 9
4.3.1 Distances through filling material . 9
4.3.2 Distances surrounding free space . 11
4.4 Connections . 12
4.4.1 Equipment . 12
4.4.2 Ex Components . 12
4.5 Capacitors . 12
4.6 Cells and batteries . 12
4.7 Temperature limitations under overload conditions. 12
4.8 Temperature limitations under malfunction conditions . 12
4.8.1 General . 12
4.8.2 Fuse . 12
4.8.3 Malfunction exclusions . 13
4.8.4 Protective devices for temperature limitation. 16
4.8.5 Power supply prospective short-circuit current . 16
5 Verifications and tests . 16
5.1 Type verifications and tests . 16
5.1.1 Pressure type test of container . 16
5.1.2 Verification of the degree of protection of the enclosure . 17
5.1.3 Dielectric strength Insulation resistance test of the filling material . 17
5.1.4 Maximum temperatures . 17
5.2 Routine verifications and tests . 18
5.2.1 Routine pressure test of container . 18
5.2.2 Dielectric strength Insulation resistance test of the filling material . 18
6 Marking . 19
7 Instructions . 20
Bibliography . 21

Figure 1 – Distances through filling material . 11

© IEC 2022
Figure 2 – Test arrangement for the dielectric strength insulation resistance test of the
filling material . 19

Table 1 – Distances through the filling material . 10
Table 2 – Creepage distances and distances through filling material. 15

– 4 – IEC 60079-5:2015+AMD1:2022 CSV
© IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 5: Equipment protection by powder filling “q”

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 consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 60079-5 edition 4.1 contains the fourth edition (2015-02) [documents 31/1156/FDIS
and 31/1171/RVD] and its amendment 1 (2022-05) [documents 31/1601/CDV and
31/1171/RVD].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
© IEC 2022
International Standard IEC 60079-5 has been prepared by IEC technical committee 31:
Equipment for explosive atmospheres.
This fourth edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
NOTE The technical changes referred to include the significant technical changes in the revised IEC standard, but
they do not form an exhaustive list of all modifications from the previous edition. More guidance may be found by
referring to the redline version of the IEC standard, if available.
Type
Minor and Major
Significant changes Clause/subclause Extension
editorial technical
changes changes
Specific references to IEC 60079-0 have been
reworded so the references to IEC 60079-0 can 4.1.3 4.8 4.8.3 X
be non-dated references
The “housing” surrounding the powder filled
equipment or Ex Component has been
redefined as a “container” to avoid confusion 4.1 X
with the “enclosure” requirements of
IEC 60079-0
A relaxation has been introduced to permit
reduced distances through filling material for
4.3.1 X
instances where there is no adjacent gap in the
container
A relaxation has been introduced to permit the
use of creepage dimensions per IEC 60079-7 4.8.3 X
where CTI is better than 175
An evaluation of joints employed when the
reduced distances according to Table 1 are 5.1.1 X
applied, has been added.
Text for determination of maximum temperature
clarified with respect to overloads and 5.1.4 X
malfunctions
A batch routine test has been i
...

IEC 60079-5 ®
Edition 4.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 5: Equipment protection by powder filling “q”

Atmosphères explosives –
Partie 5: Protection du matériel par remplissage pulvérulent “q”

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.

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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.

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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.

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IEC 60079-5 ®
Edition 4.0 2015-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 5: Equipment protection by powder filling “q”

Atmosphères explosives –
Partie 5: Protection du matériel par remplissage pulvérulent “q”

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-2249-2

– 2 – IEC 60079-5:2015 © IEC 2015
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 7
4 Constructional requirements . 7
4.1 Containers . 7
4.1.1 Closing and sealing . 7
4.1.2 Pressure test of container . 8
4.1.3 Degree of protection of the container . 8
4.1.4 Filling procedure . 8
4.1.5 Containers that are not external enclosures . 8
4.2 Filling material . 9
4.2.1 Material specification . 9
4.2.2 Documentation . 9
4.2.3 Testing . 9
4.3 Distances . 9
4.3.1 Distances through filling material . 9
4.3.2 Distances surrounding free space . 11
4.4 Connections . 12
4.4.1 Equipment . 12
4.4.2 Ex Components . 12
4.5 Capacitors . 12
4.6 Cells and batteries . 12
4.7 Temperature limitations under overload conditions . 12
4.8 Temperature limitations under malfunction conditions . 12
4.8.1 General . 12
4.8.2 Fuse . 12
4.8.3 Malfunction exclusions . 13
4.8.4 Protective devices for temperature limitation . 16
4.8.5 Power supply prospective short-circuit current . 16
5 Verifications and tests . 16
5.1 Type verifications and tests . 16
5.1.1 Pressure type test of container . 16
5.1.2 Verification of the degree of protection of the enclosure . 17
5.1.3 Dielectric strength test of the filling material . 17
5.1.4 Maximum temperatures . 17
5.2 Routine verifications and tests . 18
5.2.1 Routine pressure test of container . 18
5.2.2 Dielectric strength test of the filling material . 18
6 Marking . 19
7 Instructions. 20
Bibliography . 21

Figure 1 – Distances through filling material . 11
Figure 2 – Test arrangement for the dielectric strength test of the filling material . 19

Table 1 – Distances through the filling material. 10
Table 2 – Creepage distances and distances through filling material . 15

– 4 – IEC 60079-5:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 5: Equipment protection by powder filling “q”

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
...

IEC 60079-5 ®
Edition 4.1 2022-05
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Explosive atmospheres –
Part 5: Equipment protection by powder filling "q"

Atmosphères explosives –
Partie 5: Protection du matériel par remplissage pulvérulent "q"

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 Secretariat 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 IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 19 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
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.

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Le premier dictionnaire d'électrotechnologie en ligne au
Restez informé sur les nouvelles publications IEC. Just
monde, avec plus de 22 300 articles terminologiques en
Published détaille les nouvelles publications parues.
anglais et en français, ainsi que les termes équivalents dans
Disponible en ligne et une fois par mois par email.
19 langues additionnelles. Egalement appelé Vocabulaire

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Service Clients - webstore.iec.ch/csc

Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC 60079-5 ®
Edition 4.1 2022-05
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Explosive atmospheres –
Part 5: Equipment protection by powder filling "q"
Atmosphères explosives –
Partie 5: Protection du matériel par remplissage pulvérulent "q"
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-5711-1

IEC 60079-5 ®
Edition 4.1 2022-05
CONSOLIDATED VERSION
REDLINE VERSION
VERSIO N REDLINE
colour
inside
Explosive atmospheres –
Part 5: Equipment protection by powder filling "q"

Atmosphères explosives –
Partie 5: Protection du matériel par remplissage pulvérulent "q"

– 2 – IEC 60079-5:2015+AMD1:2022 CSV
© IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Constructional requirements . 7
4.1 Containers . 7
4.1.1 Closing and sealing . 7
4.1.2 Pressure test of container . 8
4.1.3 Degree of protection of the container . 8
4.1.4 Filling procedure . 8
4.1.5 Containers that are not external enclosures . 8
4.2 Filling material . 9
4.2.1 Material specification . 9
4.2.2 Documentation . 9
4.2.3 Testing . 9
4.3 Distances . 9
4.3.1 Distances through filling material . 9
4.3.2 Distances surrounding free space . 11
4.4 Connections . 12
4.4.1 Equipment . 12
4.4.2 Ex Components . 12
4.5 Capacitors . 12
4.6 Cells and batteries . 12
4.7 Temperature limitations under overload conditions. 12
4.8 Temperature limitations under malfunction conditions . 12
4.8.1 General . 12
4.8.2 Fuse . 12
4.8.3 Malfunction exclusions . 13
4.8.4 Protective devices for temperature limitation. 16
4.8.5 Power supply prospective short-circuit current . 16
5 Verifications and tests . 16
5.1 Type verifications and tests . 16
5.1.1 Pressure type test of container . 16
5.1.2 Verification of the degree of protection of the enclosure . 17
5.1.3 Dielectric strength Insulation resistance test of the filling material . 17
5.1.4 Maximum temperatures . 17
5.2 Routine verifications and tests . 18
5.2.1 Routine pressure test of container . 18
5.2.2 Dielectric strength Insulation resistance test of the filling material . 18
6 Marking . 19
7 Instructions . 20
Bibliography . 21

Figure 1 – Distances through filling material . 11

© IEC 2022
Figure 2 – Test arrangement for the dielectric strength insulation resistance test of the
filling material . 19

Table 1 – Distances through the filling material . 10
Table 2 – Creepage distances and distances through filling material. 15

– 4 – IEC 60079-5:2015+AMD1:2022 CSV
© IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 5: Equipment protection by powder filling “q”

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 d
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