Bus duct

In electric power distribution, a bus duct (also called busway) typically uses sheet metal, welded metal or cast resin to contain and isolate copper or aluminiumbusbars for the purpose of conducting a substantial current of electricity. It is an alternative means of conducting electricity to power cables or cable bus.

Originally a busway consisted of bare copperconductors supported on inorganic insulators, such as porcelain, mounted within a non-ventilated steel housing.