Applies to enclosed distribution boards, which are stationary, type-tested assemblies containing protective devices, and intended for use either in household applications or in other places where unskilled persons have access to them for their use. They are intended for operation on a.c., with a nominal voltage to earth not exceeding 300 V. The outgoing circuits contain short-circuit protective devices, each having a rated current not exceeding 125 A with a total incoming load current not exceeding 400 A. This Standard is technically equivalent to and reproduced from IEC 439-3:1990, including Amendment 1:1993. Requires reference to AS 3439.1.