IEC 60079-11:2023/ISH4:2025
(Main)Interpretation Sheet 4 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
Interpretation Sheet 4 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
General Information
- Status
- Published
- Publication Date
- 04-Sep-2025
- Technical Committee
- SC 31G - Intrinsically-safe apparatus
- Current Stage
- PPUB - Publication issued
- Start Date
- 05-Sep-2025
- Completion Date
- 03-Oct-2025
Relations
- Revised
IEC 60079-11:2023 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i" - Effective Date
- 26-Oct-2025
Frequently Asked Questions
IEC 60079-11:2023/ISH4:2025 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Interpretation Sheet 4 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"". This standard covers: Interpretation Sheet 4 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
Interpretation Sheet 4 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"
IEC 60079-11:2023/ISH4:2025 is classified under the following ICS (International Classification for Standards) categories: 29.260.20 - Electrical apparatus for explosive atmospheres. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 60079-11:2023/ISH4:2025 has the following relationships with other standards: It is inter standard links to IEC 60079-11:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
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Standards Content (Sample)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60079-11
Edition 7.0 2023-01
Explosive atmospheres -
Part 11: Equipment protection by intrinsic safety “i”
INTERPRETATION SHEET 4
This interpretation sheet has been prepared by subcommittee 31G: Intrinsically-safe apparatus,
of IEC technical committee 31: Explosive atmospheres.
The text of this interpretation sheet is based on the following documents:
DISH Report on voting
31G/425/DISH 31G/430/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.
___________
IEC 60079-11:2023 (Edition 7.0)
EXPLOSIVE ATMOSPHERES – Part 11: Equipment protection by intrinsic safety “i”
Background
The table of changes for IEC 60079-11:2023 (Edition 7) states:
Where two diodes are used in a safety shunt for Level of Protection “ia”, the failure of only a
single diode has been extended to the failure of a single shunt path. This means that the
tracking from the diode to reference voltages (for example, ground) no longer have to be
infallible.
ICS 29.260.20
IEC 60079-11:2023-01/ISH4:2025-09(en)
IEC 60079-11:2011 (Edition 6) 8.7.1 states:
Where diodes or Zener diodes are used as the shunt components in an infallible shunt safety
assembly, they shall form at least two parallel paths of diodes. In Level of Protection “ia” shunt
safety assemblies, only the failure of one diode shall be taken into accou
...
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