IEC 60079-0 Ed. 4.0 b:2004, Electrical apparatus for explosive gas atmospheres - Part 0: General requirements

Specifies the general requirements for construction, testing and marking of electrical apparatus and Ex components intended for use in explosive gas atmospheres. Electrical apparatus complying with this standard is intended for use in hazardous areas in which explosive gas atmospheres, caused by mixtures of air and gases, vapours or mists, exist under normal atmospheric conditions.