IEC 60079-11:2023/COR1:2023

IEC 60079-11:2023/COR1:2023 – 1 –
 IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

IEC 60079-11
Edition 7.0  2023-01


EXPLOSIVE ATMOSPHERES –

Part 11: Equipment protection by intrinsic safety "I"


CO RRI G E NDUM 1



FOREWORD
In the table showing the significance of changes between IEC 60079-11, Edition 7 and
IEC 60079-11, Edition 6 (2011 + Corrigendum 1:2012), replace rows 8, 9, 10, 19, 63, 87, 96,
127, 169 and 171 with the following new text:

Type
Explanation of the significance of changes Clause Minor and Extension Major
editorial technical
changes changes
Definitions removed as they are no longer considered 3 X
necessary.
(References are from Ed.6)
3.7.2 fault
3.10.3 Infallible separation
Diode safety barriers no longer refers to devices that 3.1.7 X
provide galvanic isolation.
7.7.5
Intrinsic safety parameters and U can have brief 3.1.12 X
m
transients above the stated values, and these do not need
7.7.3
to be taken into account.
Statements that Level of Protection "ia" and "ib" 5.2.2 X
requirements are always sufficient for Level of Protection
"ic".
Routine tests when using Table 8 – Reduced separations 6.5.3.2  X
no longer have to be performed at the most onerous
ambient condition.
Components for Level of Protection "ic" are considered to 7.2  C19
fail if they are not within their manufacturer's rating
following the application of faults.
Clarification of the failure modes for inductors and 7.6.1 X
transformers.
7.8.1
Clarification that short circuit of a single cell is considered 7.12.2  C1
a non-countable fault.
Reduced testing requirements for transformers that are 9.17.3 X
galvanically isolated from the mains.
Transformers for Level of Protection "ic" shall be routine 10.3.2  C31
tested where there is no applicable industrial standard, or
the applicable industrial standard does not specify a
routine test.
IEC 60079-11:2023-01/COR1:2023-06(en)

---------------------- Page: 1 ----------------------
– 2 – IEC 60079-11:2023/COR1:2023
 IEC 2023

5.3.1 General
Replace the existing fifth paragraph of 5.3.1 with the following new text:
Spark ignition assessment may use representative circuits that are at least as onerous for spark
ignition in place of the actual circuit under assessment.
Replace the existing first sentence of the sixth paragraph of 5.3.1 with the following new text:
Spark ignition testing conducted according to 9.1 at normal ambient temperatures, and the
ignition data in Annex A and Annex G, may be used, where the service temperature is between
−60 °C and 100 °C.
6.2.5.1 Protection by enclosure
Replace the existing first paragraph of 6.2.5.1 with the following new text:
Separations may be protected t
...