1983IEC TR 60079-2:1983 Electrical apparatus for explosive gas atmospheres. Part 2 : Electrical apparatus-type of protection "p"
IEC TR 60079-2:1983 Electrical apparatus for explosive gas atmospheres. Part 2 : Electrical apparatus-type of protection "p" was changed to IEC 60079-2:2001 Electrical apparatus for explosive gas atmospheres - Part 2: Pressurized enclosures "p".