scope:

This part of IEC 60079 contains the specific requirements for the construction and testing of electrical apparatus with pressurized enclosures, of type of protection "p", intended for use in explosive gas atmospheres. It specifies requirements for pressurized enclosures containing a limited release of a flammable substance. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirements of this standard takes precedence. This standard does not contain the requirements for: - pressurized enclosures where the containment system may release a) air with an oxygen content greater than normal, or b) oxygen in combination with inert gas in a proportion greater than 21 %; - pressurized rooms or analyser houses; see IEC 60079-13 and IEC 60079-16.