Detailed requirements for the electrical safety and performance, including methods of test, of the gas fired space heating appliances which fall within the scope of BS 5978, 5990 and 5991.Cross References:BS 31BS 88BS 546BS 562BS 731:Part 1BS 1363BS 2950BS 3042BS 3283BS 3456:Part 101BS 3535BS 3643BS 3941BS 4491BS 4568BS 4573BS 5559BS 5978BS 5990BS 5991BS 6004BS 6007BS 6500