Electrical wiring accessories for installation purposes, not specifically covered by other British Standards, for use in single phase a.c. or d.c. circuits, for voltages between conductors exceeding extra low voltage but not exceeding 250 V, and current not exceeding 45 A.The requirements for junction boxes have been replaced by BS 6220:1983. Replaced by BS 6220:1983 and BS 5733:1995 but remains current.