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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.
Steel wire armour is only used on multicore versions of the cable. A multicore cable, as the name suggests, is one where there are a number of different cores.When cable has only one core, aluminium wire armour (AWA) is used instead of steel wire.This is because the aluminium is non-magnetic. A magnetic field is produced by the current in a single core cable. multicore cable, as the name suggests, is one where there are a number of different cores. When cable has only one core, aluminium wire armour (AWA) is used instead of steel wire. This is because the aluminium is non-magnetic. A magnetic field is produced by the current in a single core cable.