scope:

This part of IEC 60079 specifies the general requirements for construction, testing and marking of electrical apparatus, and Ex components, intended for use in explosive gas atmospheres. Unless modified by one of the parts of this standard, 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 of: - temperature - 20 °C to + 60 °C; - pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar); and - air with normal oxygen content, typically 21 % v/v. The application of electrical apparatus in atmospheric conditions outside this range may need special consideration. This International Standard is supplemented or modified by the following parts of IEC 60079 concerning specific types of protection: - IEC 60079-1: Flameproof enclosures "d"; - IEC 60079-2: Pressurized enclosures "p"; - IEC 60079-5: Powder filling "q"; - IEC 60079-6: Oil immersion "o"; - IEC 60079-7: Increased safety "e"; - IEC 60079-11: Intrinsic safety "i"; - IEC 60079-15: Type of protection n - IEC 60079-18: Encapsulation "m"; This International Standard is supplemented or modified by the following apparatus standards: - IEC 62013-1: Caplights for use in mines susceptible to firedamp - Part 1: General requirements - Construction and testing in relation to the risk of explosion; - IEC 60079-25: Intrinsically safe systems; - IEC 60079-26: Special requirements for construction, test and marking of zone 0 electrical apparatus; - IEC 62086-1: