Describes the constructional features for flameproof enclosures of electrical apparatus to ensure safety in service. Such enclosures are suitable for housing electrical apparatus in atmospheres where a mixture of air and flammable gas or vapour may occur. Apply to metallic, non-metallic and composite enclosures. Includes definitions, grouping of enclosures, enclosed apparatus, joints, operating rods, shafts and bearings, inspection windows, cover gases for lighting fittings, breathing and graining devices, fastenings, mechanical strength, connection of external conductors and cables, marking, type and routine checks and tests, compliance with Section 1, cements and sealing materials and alignment with IEC Publication 79-1.

BS 229(1957) : 1957

BS EN 50018 : 2000