IEC 60079-1:2014
(Main)Explosive atmospheres - Part 1: Equipment protection by flameproof enclosures "d"
Explosive atmospheres - Part 1: Equipment protection by flameproof enclosures "d"
IEC 60079-1:2014 is available as IEC 60079-1:2014 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60079-1:2014 contains specific requirements for the construction and testing of electrical equipment with the type of protection flameproof enclosure "d", intended for use in explosive gas atmospheres. 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 will take precedence. This seventh edition cancels and replaces the sixth edition, published in 2007, and constitutes a technical revision. The numerous changes are identified in the Foreward of the document. Keywords: flameproof enclosure "d", explosive gas atmospheres
The contents of the corrigendum of June 2018 and Interpretation sheet of May 2020 have been included in this copy.
Feuille d'interprétation 1 - Atmosphères explosives - Partie 1: Protection du matériel par enveloppes antidéflagrantes "d"
IEC 60079-1:2014 est disponible sous forme de IEC 60079-1:2014 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
IEC 60079-1:2014 contient les exigences spécifiques de construction et d'essai du matériel électrique à enveloppe antidéflagrante, mode de protection "d", destiné à être utilisé dans les atmosphères explosives gazeuses. La présente Norme complète et modifie les exigences générales de l'IEC 60079-0. Lorsqu'une exigence de cette norme entre en conflit avec une exigence de l'IEC 60079-0, l'exigence de la présente norme prévaudra. Cette septième édition annule et remplace la sixième édition parue en 2007. Cette édition constitue une révision technique. Les nombreux changements sont identifiés dans l'avant-propos du document. Mots clés: enveloppe antidéflagrante "d", atmosphères explosives gazeuses
Le contenu du corrigendum de juin 2018 et de la feuille d'interprétation de mai 2020 (seulement en anglais) a été pris en considération dans cet exemplaire.
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IEC 60079-1 ®
Edition 7.0 2014-08
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 1: Equipment protection by flameproof enclosures "d"
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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IEC 60079-1 ®
Edition 7.0 2014-08
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 1: Equipment protection by flameproof enclosures "d"
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-1850-1
IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60079-1
Edition 7.0 2014-06
EXPLOSIVE ATMOSPHERES –
Part 1: Equipment protection by flameproof enclosures "d"
INTERPRETATION SHEET 1
This interpretation sheet has been prepared by IEC technical committee 31: Equipment for
explosive atmospheres.
The text of this interpretation sheet is based on the following documents:
DISH Report on voting
31/1536/DISH 31/1542/RVDISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
flameproof enclosures "d"
Question 1:
The requirements given in 13.1 of IEC 60079-1:2014 (Edition 7) restrict threaded entries for
flameproof enclosures to only metric and NPT. Does this restriction represent a major
technical change between IEC 60079-1:2014 (Edition 7) and IEC 60079-1:2007 (Edition 6)?
Answer 1:
Yes, the restriction to only metric and NPT regarding threaded entries for flameproof
enclosures does represent a major technical change between IEC 60079-1:2014 (Edition 7)
and IEC 60079-1:2007 (Edition 6). The requirements given in Clause 13 of IEC 60079-1:2007
(Edition 6) had no such normative restriction, with reference to metric and NPT only as
examples of threaded entries for flameproof enclosures.
ICS 29.260.20
– 2 – IEC 60079-1:2014/ISH1:2020
IEC 2020
While IEC 60079-1:2014 (Edition 7) only permits the use of metric and NPT threads for entry
into flameproof enclosures, cable glands/conduit entry devices, thread adapters and blanking
elements are permitted to use other thread forms (see Annex C of IEC 60079-1:2014
(Edition 7)).
NOTE 1 The intention of the restriction to only metric and NPT regarding threaded entries for flameproof
enclosures is to minimize the mismatch of thread forms in enclosure entries.
NOTE 2 In the Foreword of IEC 60079-1:2014 (Edition 7), the table detailing the significance of the changes
between IEC 60079-1:2014 (Edition 7) and IEC 60079-1:2007 (Edition 6) mistakenly did not identify this metric and
NPT restriction as a major technical change. Unfortunately, the IEC Directives do not permit a corrigendum to be
issued to correct errors in non-normative text such as the table detailing the significance of changes.
Question 2:
Where a thread adapter is fitted and assessed as a factory-assembled part of the flameproof
enclosure, what are the permitted thread forms?
Answer 2:
A thread adapter may use thread forms other than metric and NPT, whether as an Ex
Equipment thread adapter or as a thread adapter fitted and assessed as a factory-assembled
part of the flameproof enclosure (see Annex C of IEC 60079-1:2014 (Edition 7)).
Question 3:
Can a blanking element be installed in a thread adapter which is fitted and assessed as a
factory-assembled part of the flameproof enclosure?
Answer 3:
Yes, the requirements given in Clause 13 of IEC 60079-1:2014 (Edition 7) regarding thread
adapters are for separately certified Ex equipment thread adapters, not those fitted and
assessed as a factory-assembled part of the flameproof enclosure.
Question 4:
What is the required marking when a thread adapter is fitted and assessed as a factory-
assembled part of the flameproof enclosure?
Answer 4:
Clause 13 of IEC 60079-1:2014 (Edition 7) requires identification of the specific thread type
and size of threaded entries into flameproof enclosures. In the case where the thread adapter
is fitted and assessed as a factory-assembled part of the flameproof enclosure, the
requirement for identification applies to the thread form of the adapter for the field wiring
connection.
– 2 – IEC 60079-1:2014 RLV © IEC 2014
CONTENTS
CONTENTS . 2
FOREWORD . 8
1 Scope . 16
2 Normative references. 16
3 Terms and definitions . 17
4 Level of protection (equipment protection level, EPL) . 20
4.1 General . 20
4.2 Requirements for level of protection “da” . 20
4.3 Requirements for level of protection “db” . 20
4.4 Requirements for level of protection “dc” . 20
4.4.1 General . 20
4.4.2 Construction of “dc” devices . 21
4.4.3 Tests for “dc” devices . 21
5 Flameproof joints . 21
5.1 General requirements . 21
5.2 Non-threaded joints . 22
5.2.1 Width of joints (L) . 22
5.2.2 Gap (i) . 23
5.2.3 Spigot joints . 23
5.2.4 Holes in joint surfaces . 24
5.2.5 Conical joints . 26
5.2.6 Joints with partial cylindrical surfaces (not permitted for Group IIC) . 26
5.2.7 Flanged joints for acetylene atmospheres . 27
5.2.8 Serrated joints . 27
5.2.9 Multi-step joints. 28
5.3 Threaded joints . 30
5.4 Gaskets (including O-rings) . 31
5.5 Equipment using capillaries . 33
6 Sealed joints . 33
6.1 Cemented joints . 33
6.1.1 General . 33
6.1.2 Mechanical strength . 33
6.1.3 Width of cemented joints . 34
6.2 Fused glass joints . 34
6.2.1 General . 34
6.2.2 Width of fused glass joints . 34
7 Operating rods . 35
8 Supplementary requirements for shafts and bearings . 35
8.1 Joints of shafts . 35
8.1.1 General . 35
8.1.2 Cylindrical joints. 35
8.1.3 Labyrinth joints . 35
8.1.4 Joints with floating glands . 35
8.2 Bearings . 37
8.2.1 Sleeve bearings . 37
8.2.2 Rolling-element bearings . 37
9 Light-transmitting parts . 37
10 Breathing and draining devices which form part of a flameproof enclosure . 38
10.1 General . 38
10.2 Openings for breathing or draining . 38
10.3 Composition limits . 38
10.4 Dimensions . 38
10.5 Elements with measurable paths . 38
10.6 Elements with non-measurable paths . 38
10.7 Removable devices . 39
10.7.1 General . 39
10.7.2 Mounting arrangements of the elements . 39
10.8 Mechanical strength . 39
10.9 Breathing devices and draining devices when used as Ex components . 39
10.9.1 General . 39
10.9.2
...
IEC 60079-1 ®
Edition 7.0 2014-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Explosive atmospheres –
Part 1: Equipment protection by flameproof enclosures “d”
Atmosphères explosives –
Partie 1: Protection du matériel par enveloppes antidéflagrantes «d»
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.
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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77, 86 and CISPR.
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IEC 60079-1 ®
Edition 7.0 2014-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Explosive atmospheres –
Part 1: Equipment protection by flameproof enclosures “d”
Atmosphères explosives –
Partie 1: Protection du matériel par enveloppes antidéflagrantes «d»
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XD
ICS 29.260.20 ISBN 978-2-8322-1663-7
– 2 – IEC 60079-1:2014 © IEC 2014
CONTENTS
FOREWORD . 8
1 Scope . 16
2 Normative references . 16
3 Terms and definitions . 17
4 Level of protection (equipment protection level, EPL) . 19
4.1 General . 19
4.2 Requirements for level of protection “da” . 19
4.3 Requirements for level of protection “db” . 20
4.4 Requirements for level of protection “dc” . 20
4.4.1 General . 20
4.4.2 Construction of “dc” devices . 20
4.4.3 Tests for “dc” devices . 20
5 Flameproof joints . 21
5.1 General requirements . 21
5.2 Non-threaded joints . 22
5.2.1 Width of joints (L) . 22
5.2.2 Gap (i) . 22
5.2.3 Spigot joints. 22
5.2.4 Holes in joint surfaces . 23
5.2.5 Conical joints . 25
5.2.6 Joints with partial cylindrical surfaces (not permitted for Group IIC) . 25
5.2.7 Flanged joints for acetylene atmospheres . 26
5.2.8 Serrated joints . 26
5.2.9 Multi-step joints . 27
5.3 Threaded joints . 30
5.4 Gaskets (including O-rings) . 30
5.5 Equipment using capillaries . 32
6 Sealed joints. 32
6.1 Cemented joints . 32
6.1.1 General . 32
6.1.2 Mechanical strength. 32
6.1.3 Width of cemented joints . 33
6.2 Fused glass joints . 33
6.2.1 General . 33
6.2.2 Width of fused glass joints . 33
7 Operating rods . 33
8 Supplementary requirements for shafts and bearings. 34
8.1 Joints of shafts . 34
8.1.1 General . 34
8.1.2 Cylindrical joints . 34
8.1.3 Labyrinth joints . 34
8.1.4 Joints with floating glands . 34
8.2 Bearings . 36
8.2.1 Sleeve bearings . 36
8.2.2 Rolling-element bearings . 36
9 Light-transmitting parts . 36
10 Breathing and draining devices which form part of a flameproof enclosure . 37
10.1 General . 37
10.2 Openings for breathing or draining . 37
10.3 Composition limits . 37
10.4 Dimensions . 37
10.5 Elements with measurable paths . 37
10.6 Elements with non-measurable paths . 37
10.7 Removable devices . 38
10.7.1 General . 38
10.7.2 Mounting arrangements of the elements . 38
10.8 Mechanical strength . 38
10.9 Breathing devices and draining devices when used as Ex components . 38
10.9.1 General . 38
10.9.2 Mounting arrangements of the elements and components . 38
10.9.3 Type tests for breathing and draining devices used as Ex components . 38
10.9.4 Ex component certificate . 41
11 Fasteners and openings . 42
12 Materials . 43
13 Entries for flameproof enclosures . 44
13.1 General . 44
13.2 Threaded holes .
...
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