IEC 60079-15:2017
(Main)Explosive atmospheres - Part 15: Equipment protection by type of protection "n"
Explosive atmospheres - Part 15: Equipment protection by type of protection "n"
IEC 60079-15:2017 specifies requirements for the construction, testing and marking for Group II electrical equipment with type of protection “n” which includes; sealed devices “nC”, hermetically sealed devices “nC”, non-incendive components “nC” and restricted breathing enclosures “nR” intended for use in explosive gas atmospheres. This part of IEC 60079 applies to electrical equipment where the rated input voltage does not exceed 15 kV r.m.s. AC or DC including where the internal working voltages of the Ex product exceeds 15 kV, for example starters for HID luminaires. This part of IEC 60079 supplements and modifies the general requirements of IEC 60079-0, except as indicated in Table 1 (Clause 1). Where a requirement of this part of IEC 60079 conflicts with a requirement of IEC 60079-0, the requirement of this part of IEC 60079 takes precedence. This fifth edition cancels and replaces the fourth edition, published in 2010, and constitutes a technical revision. Refer to the Forward of the document for a complete listing of the technical changes between edition 5.0 and the previous edition of the document.
Keywords: Group II electrical equipment with type of protection “n”
Atmosphères explosives - Partie 15: Protection du matériel par mode de protection " n "
IEC 60079-15:2017 spécifie les exigences de construction, d’essai et de marquage de l’appareil électrique du Groupe II avec mode de protection «n» qui inclut: les dispositifs clos «nC», les dispositifs hermétiquement scellés «nC», les composants non-propagateurs de flamme «nC» et les enveloppes à respiration limitée «nR», et qui est destiné à ętre utilisé en atmosphère explosive gazeuse. La présente partie de l’IEC 60079 s’applique à l’appareil électrique dont la tension assignée d’entrée ne dépasse pas la valeur efficace de 15 kV en courant alternatif ou en courant continu, y compris lorsque les tensions internes de service du produit Ex dépassent 15 kV, par exemple les starters pour luminaires DHI. La présente partie de l’IEC 60079 complète et modifie les exigences générales de l’IEC 60079-0, à l’exception de celles qui sont indiquées dans le Tableau 1 (Clause 1). Si une exigence de la présente partie de l’IEC 60079 est en conflit avec une exigence de l’IEC 60079-0, l’exigence de la présente partie de l’IEC 60079 prévaut. Cette cinquième édition annule et remplace la quatrième édition parue en 2010. Cette édition constitue une révision technique. Reportez-vous à l'avant-propos du document pour une liste complète des modifications techniques entre l'édition 5.0 et édition précédente du document.
Mots clés: électrique du Groupe II avec mode de protection «n»
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IEC 60079-15 ®
Edition 5.0 2017-12
REDLINE VERSION
INTERNATIONAL
STANDARD
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inside
Explosive atmospheres –
Part 15: Equipment protection by type of protection "n"
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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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.
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IEC 60079-15 ®
Edition 5.0 2017-12
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 15: Equipment protection by type of protection "n"
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-5162-1
– 2 – IEC 60079-15:2017 RLV © IEC 2017
CONTENTS
FOREWORD . 5
1 Scope . 10
2 Normative references . 20
3 Terms and definitions . 22
4 General . 24
4.1 Equipment grouping and temperature classification . 24
4.2 Potential ignition sources . 24
4.3 Equipment requirements . 24
5 Maximum surface temperatures . 25
5.1 Maximum surface temperature .
5.2 Small components .
6 Requirements for electrical equipment . 25
6.1 General . 25
6.2 Opening times .
6.3 Minimum degree of protection .
6.4 Clearances, creepage distances and separations.
6.2 Electric strength insulation from earth or frame . 33
7 Connection facilities and terminal compartments .
8 Supplementary requirements for non-sparking electrical machines .
9 Supplementary requirements for non-sparking fuses and fuse assemblies .
10 Supplementary requirements for non-sparking plugs and sockets .
11 Supplementary requirements for non-sparking luminaires .
12 Supplementary requirements for equipment incorporating non-sparking cells and
batteries .
13 Supplementary requirements for non-sparking low power equipment .
14 Supplementary requirements for non-sparking current transformers .
15 Other non-sparking electrical equipment .
16 General supplementary requirements for equipment producing arcs, sparks or hot
surfaces .
17 Supplementary requirements for enclosed-break devices and non-incendive
components producing arcs, sparks or hot surfaces .
7 Requirements for non-incendive components. 58
7.1 Type testing . 58
7.2 Circuit limitations . 58
8 Supplementary Requirements for hermetically sealed devices
producing arcs, sparks or hot surfaces . 58
9 Supplementary Requirements for sealed devices
producing arcs, sparks or hot surfaces . 58
9.1 Non-metallic materials . 58
9.2 Opening . 59
9.3 Internal spaces . 59
9.4 Handling . 59
9.5 Gasket and seals . 59
9.6 Type tests . 59
10 Supplementary Requirements for restricted-breathing enclosures protecting
equipment producing arcs, sparks or hot surfaces . 59
10.1 General . 59
10.2 Constructional requirements . 60
10.2.1 Type of equipment . 60
10.2.2 Cells and batteries . 61
10.2.3 Cable glands and conduit entries . 61
10.2.4 Operating rods, spindles and shafts . 61
10.2.5 Windows . 61
10.2.6 Gasket and seal requirements . 62
10.2.7 Non-resilient seals . 62
10.2.8 Test port . 62
10.2.9 Internal fans . 63
10.3 Temperature limitation . 64
10.4 Additional requirements for restricted-breathing luminaires . 64
10.4.1 Mounting arrangement . 64
10.4.2 Reflectors . 64
10.4.3 Surface temperatures of restricted-breathing luminaires . 64
11 Type tests . 65
11.1 Tests for non incendive components . 65
11.1.1 Preparation of non-incendive component samples . 66
11.1.2 Test conditions for non-incendive components . 66
11.2 Tests for sealed devices . 67
11.2.1 Conditioning . 67
11.2.2 Voltage test . 67
11.3 Type test requirements for restricted-breathing enclosures . 69
11.3.1 General . 69
11.3.3 Alternative type test for equipment where the volume of the enclosure
changes due to pressure . 69
12 Routine verifications and tests . 74
12.1 Electric strength test . 74
12.2 Routine test requirements for restricted-breathing enclosures . 75
12.2.1 General . 75
12.2.2 Test procedure . 75
12.3 Routine temperature rise test . 76
12.4 Temperature calculation . 76
13 Marking . 77
13.1 General . 77
13.2 Examples of marking . 78
13.3 Warning markings . 79
14 Documentation . 79
15 Instructions . 79
21 General information on verification and tests .
Annex A (informative) Application, installation, and testing considerations for Ex “nA”
asynchronous machines .
Bibliography . 83
Figure 1 – Examples for determining clearances and creepage distances .
– 4 – IEC 60079-15:2017 RLV © IEC 2017
Table 1 – Relationship of this part IEC 60079-15 to IEC 60079-0 . 10
Table 2 – Minimum creepage distances, clearances and separations .
Table 3 – Tracking resistance of insulating materials .
Table 4 – Separation in compound-filled cable sealing boxes.
Table 5 – Assumed voltage of neutral p
...
IEC 60079-15 ®
Edition 5.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 15: Equipment protection by type of protection "n"
Atmosphères explosives –
Partie 15: Protection du matériel par mode de protection «n»
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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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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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 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. 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 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 60079-15 ®
Edition 5.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 15: Equipment protection by type of protection "n"
Atmosphères explosives –
Partie 15: Protection du matériel par mode de protection «n»
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-5047-1
– 2 – IEC 60079-15:2017 © IEC 2017
CONTENTS
FOREWORD . 4
1 Scope . 9
2 Normative references . 15
3 Terms and definitions . 16
4 General . 17
4.1 Equipment grouping and temperature classification . 17
4.2 Potential ignition sources . 17
4.3 Equipment requirements . 17
5 Maximum surface temperatures . 17
6 Requirements for electrical equipment . 18
6.1 General . 18
6.2 Electric strength insulation from earth or frame . 18
7 Requirements for non-incendive components. 18
7.1 Type testing . 18
7.2 Circuit limitations . 18
8 Requirements for hermetically sealed devices . 18
9 Requirements for sealed devices . 19
9.1 Non-metallic materials . 19
9.2 Opening . 19
9.3 Internal spaces . 19
9.4 Handling . 19
9.5 Gasket and seals . 19
9.6 Type tests . 19
10 Requirements for restricted-breathing enclosures . 19
10.1 General . 19
10.2 Constructional requirements . 20
10.2.1 Type of equipment . 20
10.2.2 Cells and batteries . 20
10.2.3 Cable glands and conduit entries . 20
10.2.4 Operating rods, spindles and shafts . 21
10.2.5 Windows . 21
10.2.6 Gasket and seal requirements . 21
10.2.7 Non-resilient seals . 21
10.2.8 Test port . 22
10.2.9 Internal fans . 23
10.3 Temperature limitation . 23
10.4 Additional requirements for restricted-breathing luminaires . 23
10.4.1 Mounting arrangement . 23
10.4.2 Reflectors . 23
10.4.3 Surface temperatures of restricted-breathing luminaires . 23
11 Type Tests . 24
11.1 Tests for non incendive components . 24
11.1.1 Preparation of non-incendive component samples . 24
11.1.2 Test conditions for non-incendive components . 24
11.2 Tests for sealed devices . 25
11.2.1 Conditioning . 25
11.2.2 Voltage test . 25
11.2.3 Leakage tests on sealed devices . 25
11.3 Type test requirements for restricted-breathing enclosures . 26
11.3.1 General . 26
11.3.2 Equipment where the volume of the enclosure will be unchanged due to
pressure . 26
11.3.3 Alternative type test for equipment where the volume of the enclosure
changes due to pressure . 26
12 Routine verifications and tests . 27
12.1 Electric strength test . 27
12.2 Routine test requirements for restricted-breathing enclosures . 27
12.2.1 General . 27
12.2.2 Test procedure . 27
12.3 Routine temperature rise test . 28
12.4 Temperature calculation . 28
13 Marking . 29
13.1 General . 29
13.2 Examples of marking . 29
13.3 Warning markings . 29
14 Documentation . 29
15 Instructions . 30
Bibliography .
...
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