BUS DUCTS

BUS DUCTS

In electrical power distribution, a busbar (also spelled bus bar, or sometimes as buss bar or buss bar, with the term bus being a contraction of the Latin omnibus, "for all") is a metallic strip or bar (typically copper, brass or aluminum) that conducts electricity within a switchboard, distribution board, substation, battery bank, or other electrical apparatus. Its main purpose is to conduct a substantial current of electricity, and not to function as a structural member.

The material composition and cross-sectional size of the busbar determine the maximum amount of current that can be safely carried. Busbars can have a cross-sectional area of as little as 10 mm2, but electrical substations may use metal tubes 50 mm in diameter (20 cm2) or more as busbars. An aluminum smelter will have very large busbars used to carry tens of thousands of amperes to the electrochemical cells that produce aluminum from molten salts.