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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.
Armoured cable or SWA (steel wired armoured) cable is the accepted standard for underground installations. This wire can be buried in the ground or can be fastened to exterior walls using cleats.The galvanised steel wire protects the wire from accidental damage caused by digging etc.he galvanised steel wire can be used as an additional earth and sometimes is used as the only earth, although this is not recommended. When the armoured cable terminates at an appliance or junction box a gland is used. You must get the correct size and type of gland for the job at hand.