This part of IEC 60079 contains the specific requirements for the construction and testing ofelectrical apparatus with pressurized enclosures, of type of protection “p”, intended for use inexplosive gas atmospheres. It specifies requirements for pressurized enclosures containing alimited release of a flammable substance.This standard supplements and modifies the general requirements of IEC 60079-0. Where arequirement of this standard conflicts with a requirement of IEC 60079-0, the requirements ofthis standard takes precedence.This standard does not contain the requirements for:? pressurized enclosures where the containment system may releasea) air with an