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Electrical apparatus for explosive gas atmospheres - Part 25: Intrinsically safe systems

Executive summary

Requirements for the construction and assessment of intrinsically safe electrical systems with type of protection “i” for explosive atmospheres.


This standard, a part of the IEC 60079 series, contains the specific requirements for the construction and assessment of intrinsically safe electrical systems, type of protection “i”, intended for use, as a whole or in part, in explosive atmospheres in Group II locations. This European Standard is intended for use by the designer of the system who may be a manufacturer, a specialist consultant or a member of the end-user’s staff.

This European Standard supplements IEC 60079-11, the requirements of which apply to electrical apparatus used in intrinsically safe electrical systems.

The installation requirements of a Group II system designed in accordance with this standard are specified in IEC 60079-14.

History and related standards

This European Standard supersedes BS 5501-9:1982 which is withdrawn.

This standard includes the following cross references:

IEC 60060-1, IEC 60079-0, IEC 60079-11:1999, IEC 60079-14:2002.

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