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IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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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.
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IEC 60079-1:2014 Edition 7.0, Explosive atmospheres – Part 1: Equipment protection by
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
IEC 60079-1:2014-06/ISH1:2020-06(en)
– 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 NP
...