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Steel wire armoured cable, commonly abbreviated as SWA, is a hard-wearing power cable designed for the supply of mains electricity.t is one of a number of armoured electrical cables â which include 11kV Cable and 33kV Cable â and is found in underground systems, power networks and cable ducting.
A power cable is an assembly of one or more electrical conductors, usually held together with an overall sheath.The assembly is used for transmission of electrical power. Power cables may be installed as permanent wiring within buildings, buried in the ground, run overhead, or exposed.Flexible power cables are used for portable devices, mobile tools and machinery.istory [edit]. Early telegraph systems used the first forms of electrical cabling, transmitting tiny amounts of power. Gutta-percha insulation used on the first submarine cables was, however, unsuitable for building wiring use since it deteriorated rapidly when exposed to air.