This standard covers assemblies of metal-enclosed conductors along with associated interconnections@ enclosures@ and supporting structures. When switches and disconnecting links are included@ they shall conform to this standard. Basically@ this standard is concerned with performance characteristics of enclosed@ rather than open@ conductor assemblies. It does not pertain to busyways or bus assemblies for distribution of electric power less than 600 V consisting of enclosed sectionalized prefabricated bus bars or associated structures and fittings@ such as feeder busways (indoor or outdoor) and plug-in busways (indoor only). It does not include enclosed bus assemblies utilized at voltages in excess of 38.0 kV (see ANSI/UL 857-1981 [9] ).1 1The numbers in brackets correspond to those of the references listed in Section 3.; when preceded by B@ they correspond to the bibliography in Section 10.