ANSI/ISA 12.04.01-2010

This standard contains the specific requirements for the construction and testing of electrical apparatus with pressurized enclosures, of type of protection p, intended for use in hazardous (classified) locations defined as Class I, Zone 1 or Zone 2 by the National Electrical Code (NEC), ANSI/NFPA 70. It specifies requirements for pressurized enclosures containing a limited release of a flammable substance

This product referenced by:API RP 500 - Explosive atmospheres - Part 2: Equipment protection by pressurized enclosures p (IEC 60079-2 Mod)
This product replaces:ANSI/ISA 12.04.01-2004 - Electrical Apparatus for Explosive Gas Atmospheres - Part 2 Pressurized Enclosures 'p' (IEC 60079-2 Mod)