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A bus-bar refers in electrical power distribution to thick strips of copper or other material that conduct electricity around a switchboard, distribution board, substation, or other electrical apparatus.

The size of the bus-bar determines the maximum amount of current that can be safely carried. Small distribution boards or consumer units may have busbars which have a cross sectional area of as little as 10 mm² but large electrical substations may use metal tubes of 50 mm or more in diameter as busbars.

Busbars are typically either flat strips or hollow tubes as these shapes allow heat to dissipate more efficiently due to their high surface area to cross-sectional area ratio. The skin effect makes AC busbars more than about 8 mm (1/3 in) thick inefficient.

Bus-bars are usually suitably insulated for the voltage which they carry. The bus-bar may either be supported on insulators, or else insulation may completely surround the bus-bar. Bus-bars are protected from accidental contact either by being surrounded in a sheet metal enclosure or by being placed out of normal reach. Neutral bus-bars may also be insulated. Earth bus-bars are typically bolted directly onto any metal chassis of their enclosure.