Electrical apparatus for explosive gas atmospheres, Part 2: Pressurized enclosures

Abstract

This recommendation covers the requirements for enclosures for electrical machines and apparatus in which the entry of flammable gases or vapours is prevented by maintaining the air (or ,other nonflammable gas) within the enclosure at a pressure above that of the external atmosphere. The recommendation is confined to the enclosure itself and to fittings directly associated with the enclosure which are concerned with pressurization. It is acknowledged that careful consideration must be given to the auxiliary apparatus needed for the supply of the pressurizing medium to the enclosure. Guidance on this and other matters not directly connected with the specification of the enclosure itself is given in an appendix.