Explosive atmospheres - Part 15: Equipment protection by type of protection "n"

IEC 60079-15:2017 is available as IEC 60079-15:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
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 est disponible sous forme de IEC 60079-15:2017 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
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»

General Information

Status
Published
Publication Date
07-Dec-2017
Current Stage
PPUB - Publication issued
Completion Date
08-Dec-2017
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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»
IEC 60079-15:2017-12(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 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

---------------------- Page: 4 ----------------------
IEC 60079-15:2017 © IEC 2017 – 3 –

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 .......................................................................................................................... 31

Table 1 – Relationship of IEC 60079-15 to IEC 60079-0 ......................................................... 9

Table 2 – Text of warning markings ...................................................................................... 29

---------------------- Page: 5 ----------------------
– 4 – IEC 60079-15:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 15: Equipment protection by type of protection "n"
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 60079-15 has been prepared by IEC technical committee 31:

Equipment for explosive atmospheres.

This fifth edition cancels and replaces the fourth edition, published in 2010, and constitutes a

technical revision.

This edition includes the following significant changes with respect to the previous edition:

The text of this International Standard is based on the following documents:
FDIS Report on voting
31/1339/FDIS 31/1355/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.
---------------------- Page: 6 ----------------------
IEC 60079-15:2017 © IEC 2017 – 5 –

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

This International Standard is to be read in conjunction with IEC 60079-0.

A list of all parts of the IEC 60079 series, under the general title: Explosives atmospheres,

can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
– 6 – IEC 60079-15:2017 © IEC 2017
Type
Changes Clause Minor and Extension Major
editorial technical
changes changes
Requirements for enclosed break devices have - C1
been removed
Requirements for type of protection “nA” has - C2
been removed
Scope has been updated to allow equipment with 1 X
internal working voltages over 15 kV such as
starters for HID luminaires
Definition for cable sealing box removed 3 X
Definitions for creepage distance and clearance 3 X
removed as they are now in 60079-0
Definition of non-sparking device “nA” removed, 3 C2
as the concept has been transferred to 60079-7
Definition of duty cycle removed 3 X
Definition of enclosed break device moved as the 3 C1
concept has been transferred to 60079-1
Definition of hermetically sealed device revised 3 A1
Definition for normally sparking device added 3.2 X
Small component temperature clause removed, 5 C2
part of moving type of protection “nA” to 60079-7
Minimum degree of protection requirements; 6 C2
clearance, creepage and separation
requirements; determination of working voltage;
conformal coating; CTI requirement; Insulation
between conductive parts and measurement of
creepage and clearance requirements have been
removed.
Connection facilities and terminal compartment - C2
requirements have been removed
Supplementary requirements for non-sparking - C2
electrical rotating machines have been removed
Supplementary requirements for non-sparking - C2
fuses and fuse assemblies have been removed
Supplementary requirements for non-sparking - C2
plugs and sockets have been removed
Supplementary requirements for non-sparking - C2
luminaires have been removed
Supplementary requirements for equipment - C2
incorporating non-sparking cells and batteries
have been removed
Supplementary requirements for non-sparking low - C2
power equipment have been removed
Supplementary requirements for non-sparking - C2
current transformers have been removed
Requirements for other non-sparking electrical - C2
equipment have been removed
General supplementary requirements for - C2
equipment producing arcs, sparks or hot surfaces
have been removed
Requirements for enclosed break devices have - C1
been removed
Voltage and current limitations added for non- 7.2 C6
incendive components.
---------------------- Page: 8 ----------------------
IEC 60079-15:2017 © IEC 2017 – 7 –
Type
Changes Clause Minor and Extension Major
editorial technical
changes changes
The requirements for sealed devices have been 9.1 X
extended to require more documentation,
The +20K requirement for luminaire materials has 9.5 C2
been removed
Notes 1-3 have been removed, as this information 10.1 X
is covered elsewhere
Entry device requirements added 10.1 X
Industrial standard compliance and battery 10.2.1.2 X
requirements added
The exemption for manually operated sparking 10.2.1.2 X
devices moved to here, creepage and clearance
requirements in industrial standards added for
switching devices, and cell and battery
requirements added
Requirements for cable glands and conduit 10.2.3 X
entries have been clarified
Requirements for gasketed windows expanded to 10.2.5.2 X
allow a removable window mounted in a frame.
Requirement to include documentation on the 10.2.6 C4
thermal stability of gaskets or seals added
Requirements reworded for clarity 10.2.7 X
Requirements for “nR” enclosures fitted with fans 10.2.9 C5
added.
Type test requirements for enclosed break “nC” - C1, C2
and “nA” equipment removed
The dielectric test after the leakage test for 11.2.2 X
sealed devices has been eliminated unless the
results of the leakage test are uncertain.
Tests for sealed devices, screw lampholders, - C2
starters, lamps, ignitors, and ignitor pulses for
luminaires have been removed
All testing for batteries has been removed. - C2
All testing for electrical machines removed - C2
Routine test requirements re-written for sealed 12 C1, C2
components, non-incendive components and
restricted breathing equipment to take out the
testing for enclosed break and nA equipment
Preparation of non-incendive component samples 11.1.1 C3
Marking requirements modified to remove - C1, C2
labelling requirements for enclosed break
components, nA equipment, and batteries.
Documentation requirements modified to remove 14 C1, C2
to remove labelling requirements for enclosed
break components, nA equipment, and batteries.
The instruction section has been expanded to 15 X
include new requirements
Annex A has been removed. - C2

NOTE The technical changes referred to include the significance of technical changes in the revised IEC

Standard, but they do not form an exhaustive list of all modifications from the previous version.

---------------------- Page: 9 ----------------------
– 8 – IEC 60079-15:2017 © IEC 2017
Explanation of the types of changes:
A) Definitions
1) Minor and editorial changes:
• Clarification
• Decrease of technical requirements
• Minor technical change
• Editorial corrections

These are changes which modify requirements in an editorial or a minor technical way.

They include changes of the wording to clarify technical requirements without any

technical change, or a reduction in level of existing requirement.
2) Extension: Addition of technical options

These are changes which add new or modify existing technical requirements, in a way

that new options are given, but without increasing requirements for equipment that was

fully compliant with the previous standard. Therefore, these will not have to be
considered for products in conformity with the preceding edition.
3) Major technical changes:
• addition of technical requirements
• increase of technical requirements
These are changes to technical requirements (addition, increase of the level or

removal) made in a way that a product in conformity with the preceding edition will not

always be able to fulfil the requirements given in the later edition. These changes have

to be considered for products in conformity with the preceding edition. For these

changes additional information is provided in Clause B below.

NOTE These changes represent current technological knowledge. However, these changes should not

normally have an influence on equipment already placed on the market.
B) Information about the background of changes

A1 – It was determined that this was already covered by the sealed device definition

C1 – Enclosed break devices “nC” are now designated as “dc” and the requirements are

located in IEC 60079-1:2014.

C2 – Type of protection “nA” is now designated as type of protection “ec” and the

requirements for “ec” equipment are located in IEC 60079-7:2015.
C3 – Test time for the preparation of non-incendive component samples has been
specified.
C4 – Additional documentation requirements for seals and gaskets.
C5 – As the pressure inside an enclosure fitted with fans can be affected by the
operation of the fan, it is now specified that the restricted breathing test is
conducted with fans operating and stationary.
C6 – The limitations from IEC 60079-15 Ed 3 were added.
---------------------- Page: 10 ----------------------
IEC 60079-15:2017 © IEC 2017 – 9 –
EXPLOSIVE ATMOSPHERES –
Part 15: Equipment protection by type of protection "n"
1 Scope

This part of IEC 60079 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. 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.

Table 1 – Relationship of IEC 60079-15 to IEC 60079-0
Clause of IEC 60079-0 IEC 60079-0 clause application to IEC 60079-15
Ed. 6.0 1 Clause / Subclause
Ed. 7.0
(2011) title
(future Protected sparking Restricted breathing
edition)
(informative) (normative)
“nC” “nR”
(informative)
3 3 Definitions Applies Applies
4 4 Equipment grouping
4.1 4.1 Group I Excluded Excluded
4.2 4.2 Group II Applies Applies
4.3 4.3 Group III Excluded Excluded
4.4 4.4 Equipment for a Applies Applies
particular explosive
atmosphere
5 5 Temperatures
5.1 5.1 Environmental Applies Applies
influences
5.2 5.2 Service temperature Applies Applies
5.3 5.3 Maximum surface
temperature
5.3.1 5.3.1 Determination of Applies Applies
maximum surface
temperature
5.3.2 5.3.2 Limitation of maximum
surface temperature
5.3.2.1 5.3.2.1 Group I equipment Excluded Excluded
5.3.2.2 5.3.2.2 Group II equipment Applies Applies
5.3.2.3 5.3.2.3 Group III equipment Excluded Excluded
___________
Under preparation. Stage at the time of publication: IEC/FDIS 60079-0:2017.
---------------------- Page: 11 ----------------------
– 10 – IEC 60079-15:2017 © IEC 2017
Clause of IEC 60079-0 IEC 60079-0 clause application to IEC 60079-15
Ed. 6.0 1 Clause / Subclause
Ed. 7.0
(2011) title
Protected sparking Restricted breathing
(future
edition)
(informative) (normative)
“nC” “nR”
(informative)
5.3.3 5.3.3 Small component Applies Excluded
temperature for Group I
and Group II equipment
- 5.3.4 Component temperature Applies Excluded
of smooth surfaces for
Group
...

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