Requirements for busbars and busbar connections which are components of a.c. high voltage electrical systems (above 1 kV), composed of metal, with air, oil, gas, solid or semi-solid insulation.Cross References:BS 91BS 223BS 1433BS 1977BS 2898BS 3580BS 4109BS 4608BS 5227BS 5486:Part 1BS 5490BS 5524BS 5559BS 5622:Part 2BS 6581BS 6926BS 7354