IEC 60079-0:2011/ISH2:2014
(Main)Interpretation sheet 2 - Explosive atmospheres - Part 0: Equipment - General requirements
Interpretation sheet 2 - Explosive atmospheres - Part 0: Equipment - General requirements
Feuille d'interprétation 2 - Atmosphères explosives - Partie 0: Matériel - Exigences générales
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Standards Content (Sample)
TC 31/IEC 60079-0 (2011), sixth edition/I-SH 02
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:
ISH Report on voting
31/1132/ISH 31/1153/RVISH
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.
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Following decision No 16 of the TC 31 meeting in Melbourne in 2011, the issuing of an
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Interpretation Sheet for IEC 60079-0:2011 (6 edition ) was requested, in order to clarify the
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significance of the changes with respect to the 5 edition.
Question
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What are the minor editorial, extensions, and major technical changes of the 6 edition with
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respect to the 5 edition?
Answer
The following table shows the significance of the changes.
The significance of the changes between IEC Standard, IEC 60079-0, Edition 5, 2007-10
(Including Corrigendum No.1 and Interpretation Sheet I-SH 01) and IEC 60079-0, Edition 6,
2011-06 are as listed below:
October 2014 ICS 29.260.20
Type
Explanation of the significance of the changes Clause Minor and Extension Major
editorial technical
changes changes
Expansion of material specification data for 7.1.2 x
plastics and elastomers, including UV resistance
Addition of alternative qualification for O-rings 7.2.3 x
Addition of alternative criteria for surface 7.4.2 a) x
resistance
Addition of alternative breakdown voltage limit for 7.4.2 c) x
non-metallic layers applied to metallic enclosures
Expansion of “X” marking options for non-metallic 7.4.2 d) x
enclosure materials not meeting basic electrostatic 7.4.2 e)
requirements
Clarification that non-metallic enclosure 7.4.3 x
requirements also apply to painted or coated metal
enclosures
Clarification of test to determine capacitance of 7.5 C1
accessible metal parts with reduction in acceptable Table 9
capacitance
Addition of limits on zirconium content for Group III 8.3 x
and Group II (Gb only) enclosures 8.4
Introduction of “X” marking for Group III enclosures 8.4 x
not complying with basic material requirements,
similar to that existing for Group II
Addition of button-head cap screws to permitted 9.2 x
“Special Fasteners”
Reference for protective earthing (PE) 15.3 x
requirements for electrical machines to IEC 60034
Addition of requirements for ventilating fans 17.1.5 C2
Addition of requirement for temperature rating of 17.2 x
bearing lubricants
Addition of alternative construction for 18.2 x
disconnectors
Removal of voltage limits on plugs and sockets 20.2 x
Addition of test requirements for arc-quenching 20.2 C3
test on plugs and sockets
Additional information on cell voltages 23.3 C4
Table 12
Revision to impact test of glass parts 26.4.2 x
Revision to impact test procedure to address 26.4.2 x
“bounce” of impact head
Clarification of the test requirements for “service” 26.5.1.2 x
and “surface” temperature 26.5.1.3
Clarification of temperature rise tests for 26.5.1.3 x
converter-fed motors
Addition of alternative test method for thermal 26.8 x
endurance Table 15
Removal of “charging test” and addition of note Formerly C5
providing guidance 26.14
Clarification of test for the measurement of 26.14 C6
capacitance, revision of maximum capacitance
Addition of tests for ventilating fans 26.15 C2
Addition of alternative o-ring testing 26.16 x
Addition of a “Schedule of Limitations” to 28.2 x
October 2014 ICS 29.260.20
Type
Explanation of the significance of the changes Clause Minor and Extension Major
editorial technical
changes changes
certificates for Ex Components
Clarification of the marking for multiple 29.4 d) x
temperature classes
29.5 d)
Addition of marking for converter-fed motors 29.15 x
Removal of IP marking for Group III 29.5 x
Addition of specific instructions for electrical 30.3 x
machines and for ventilating fans 30.4
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. More guidance
may be found by referring to the Redline Version of the standard.
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 ‘Major technical changes’
C1 – The values in the table have been significantly reduced based on information that is intended to be published
in IEC TS 60079-32-1 (currently in preparation).
C2 – The requirements for fans was added at the request of the IECEx International Product Certification Scheme.
C3 – The test has been introduced for all disconnectors as an alternative to the voltage and current restrictions in
the previous standard which were considered to be arbitrary.
C4 – There has been a slight increase in some cell voltages. This is a minor change for most protection concepts
but should be regarded as a major change for equipment having a type of protection relying on energy limitation,
e.g. IEC 60079-11
C5 – The charging test was removed as it had been found to be not repeatable. Guidance will be given in IEC TS
60079-32-1 (currently in preparation).
C6 – The limits for capacitance have been decreased based on technical information in CLC/TR 50404.
October 2014 ICS 29.260.20
CE 31/IEC 60079-0 (2011), sixième édition/I-SH 02
ATMOSPHÈRES EXPLOSIVES –
Partie 0: Matériel – Exigences générales
FEUILLE D'INTERPRÉTATION 2
Cette feuille d’interprétation a été établie par le comité d’études 31 de l’IEC: Equipements
pour atmosphères explosives.
Le texte de cette feuille d’interprétation est issue des documents suivants:
ISH Rapport de vote
31/1132/ISH 31/1153/RVISH
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à l'approbation de cette feuille d’interprétation.
___________
Conformément à la décision n°16 prise par le CE 31 lors de sa réunion à Melbourne en 2011,
ème
la publication d'une feuille d'interprétation pour l
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