IEC 60079-0:2007
(Main)Explosive atmospheres - Part 0: Equipment - General requirements
Explosive atmospheres - Part 0: Equipment - General requirements
Specifies the general requirements for construction, testing and marking of electrical apparatus and Ex components intended for use in explosive gas atmospheres. Electrical apparatus complying with this standard is intended for use in hazardous areas in which explosive gas atmospheres, caused by mixtures of air and gases, vapours or mists, exist under normal atmospheric conditions. The significant changes with respect to the previous edition are: Requirements for explosive dust atmospheres transferred from IEC 61241-0, The marking Group "II" alone has been replaced by "IIA", "IIB", or "IIC" as many of the enclosure requirements are now aligned with a specific sub-group, Dust groups defined as Group IIIA, IIIB and IIIC, Remainder of "electrostatic" requirements transferred from IEC 60079-26 and Equipment protection levels (EPL) introduced.
The contents of the interpretation sheets of November 2008 and April 2019, and the corrigendum of December 2010 have been included in this copy.
Atmosphères explosives - Partie 0: Matériel - Exigences générales
Spécifie les exigences générales de construction, d'essais et de marquage du matériel électrique et des composants Ex destinés à être utilisés dans des atmosphères explosives gazeuses. Le matériel électrique conforme à la présente norme est prévu pour être utilisé dans des emplacements dangereux, dans lesquels les atmosphères explosives gazeuses, provoquées par des mélanges d'air et de gaz, vapeurs ou brouillards, existent dans des conditions atmosphériques normales.Les principales modifications apportées par rapport à l'édition précédente sont: Les exigences relatives aux atmosphères de poussières explosives ont été transférées de la CEI 61241-0, Le marquage du groupe " II " considéré isolément a été remplacé par " IIA ", " IIB " ou " IIC " parce que certaines des exigences relatives aux enveloppes sont maintenant propres à un sous-groupe spécifique, Les groupes pour les poussières sont définis comme Groupes IIIA, IIIB et IIIC, un rappel des exigences relatives aux phénomènes électrostatiques a été transféré de la CEI 60079-26, et Le niveau de protection du matériel (EPL) a été introduit.
Le contenu des feuilles d’interprétation de novembre 2008 et avril 2019, et du corrigendum de décembre 2010 a été pris en considération dans cet exemplaire.
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IEC 60079-0
Edition 5.0 2007-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 0: Equipment – General requirements
Atmosphères explosives –
Partie 0: Matériel – Exigences générales
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IEC 60079-0
Edition 5.0 2007-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 0: Equipment – General requirements
Atmosphères explosives –
Partie 0: Matériel – Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XD
CODE PRIX
ICS 29.260.20 ISBN 2-8318-9326-7
TC 31/Publication 60079-0 (2007), Fifth edition/I-SH 01
EXPLOSIVE ATMOSPHERES –
Part 0: Equipment –
General requirements
INTERPRETATION SHEET
This interpretation sheet has been prepared by committee 31: Equipment for explosive
atmospheres, of IEC.
The text of this interpretation sheet is based on the following documents:
ISH Report on voting
31/768/ISH 31/779/RVD
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.
___________
Subclauses 26.8 and 26.9 of IEC 60079-0 (2007)
Following the discussions by the TC 31/WG 22 Task Group addressing the repeatability of the
thermal endurance to heat and thermal endurance to cold tests it was proposed that a
tolerance be clarified for the test periods in Edition 6, 31/744/DC was issued and comments
received and resolved as 31/752A/INF.
These interpretations are made available for edition 5 of this standard due to the current use
of that standard by manufacturers, conformity assessment schemes and national bodies by
means of this “Interpretation Sheet” as follows:
Details of interpretation:
Interpretation of subclause 26.8 Thermal endurance to heat and 26.9 Thermal endurance
to cold of IEC 60079-0 (2007):
Question: As it is unreasonable to consider them to be the exact test time, are the time
frames for the 24 h, 336 h (2 weeks) or 672 h (4 weeks) tests considered to be the minimum
times? If so, what is the maximum time?
Interpretation: The 24 h, 336 h and 672 h values are considered the minimum number of
+2
hours for each of the tests. It is practical that the time periods should not extend beyond 24
+30 +30
h, 336 h, 672 h.
0 0
It is intended that this interpretation will be introduced in IEC 60079-0 Edition 6 and therefore
an Interpretation Sheet will not be required for this or future editions.
November 2008 ICS 29.260.20 French text overleaf
IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60079-0
Edition 5.0 2007-10
EXPLOSIVE ATMOSPHERES –
Part 0: Equipment – General requirements
INTERPRETATION SHEET 2
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
31/1453/DISH 31/1466/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.
___________
Interpretation sheet of Subclause 16.5 of IEC 60079-0:2007
The TC 31/CAG requested (Resolution 2 of 2018-04-19) that WG 22 prepare an interpretation
sheet based on IECEx Decision Sheet DS2018/002 addressing the assignment of entry point
and branching point temperatures of electrical rotating machines.
This interpretation is made available for Edition 5 of this standard due to the current use of
that standard by manufacturers, conformity assessment schemes and national bodies by
means of this “Interpretation Sheet” as follows:
ICS 29.260.20
– 2 – IEC 60079-0:2007/ISH2:2019
IEC 2019
Details of interpretation:
requirements
Interpretation of Subclause 16.5 Temperature at branching point and entry point:
Question: Subclause 16.5 of IEC 60079-0:2007 (Ed. 5) states “When the temperature under
rated conditions is higher than 70 °C at the entry point or 80 °C at the branching point of the
conductors, information shall be marked on the equipment exterior to provide guidance to the
user on the proper selection of cable and cable gland or conductors in conduit.”
It is not normal practice for electrical rotating machines to be tested with the cable entry
devices and cables that might be used in an actual installation, but with the cables available
at the manufacturer’s test area. In many cases, there will be no formal entry device as the
cables will enter via the space reserved for fixing of a gland plate.
How shall the relevant entry point and branching point temperatures be determined?
Interpretation: The use of the maximum internal air space temperature to represent the
maximum service temperature of terminal box gaskets and seals, the cable branching point
temperature, and the entry point temperature reflects the normal practice of testing electrical
rotating machines without prior knowledge of the actual glands and cables to be used for
installation. The production of heat from the electrical rotating machine connections is
generally insignificant with respect to the production of heat from the machine windings and
core.
Further amplification:
1) The entry point of the cable where the temperature is measured should be sealed so far
as possible to ensure that there is minimum air-circulation which can reduce the measured
temperature.
2) This is not intended to apply to any gasket between the terminal box and the frame of the
electrical rotating machine, where higher temperatures may be recorded, but only to the
gasket between the terminal box and its lid.
Although written in the context of electrical rotating machines, there may be other types of
equipment where an equivalent approach is applicable.
– 2 – 60079-0 © IEC:2007
CONTENTS
FOREWORD.8
1 Scope.10
2 Normative references .11
3 Terms and definitions .14
4 Equipment grouping .24
4.1 Group I.24
4.2 Group II.24
4.3 Group III.25
4.4 Equipment for a particular explosive atmosphere.25
5 Temperatures .25
5.1 Environmental influences .25
5.1.1 Ambient temperature .25
5.1.2 External source of heating or cooling.25
5.2 Service temperature .26
5.3 Maximum surface temperature .26
5.3.1 Determination of maximum surface temperature .26
5.3.2 Limitation of maximum surface temperature.26
5.3.3 Small component temperature for Group I or Group II electrical
equipment .27
6 Requirements for all electrical equipment .28
6.1 General .28
6.2 Mechanical strength of equipment .29
6.3 Opening times .29
6.4 Circulating currents .29
6.5 Gasket retention.30
6.6 Electromagnetic and ultrasonic energy radiating equipment .30
6.6.1 Radio frequency sources .30
6.6.2 Lasers or other continuous wave sources .31
6.6.3 Ultrasonic sources .31
7 Non-metallic enclosures and non-metallic parts of enclosures .31
7.1 General .31
7.1.1 Applicability .31
7.1.2 Specification of materials.31
7.1.3 Plastic materials .32
7.1.4 Elastomeric materials .32
7.2 Thermal endu
...
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