BS 6346 VV32 PVC Insulated SWA Armoured Power Cable. SWA Cable or Steel wire armoured cable is a hard-wearing cable made up of Black PVC Sheath, PVC insulation, copper conductors and steel wire armouring. SWA Cable is designed for mains electricity for laying underground, power networks, incoming mains to homes amongst a host of other applications externally and internally. SWA Cable is also handy as it allows the user to use the cable for direct burial and the armour enables the cable to withstand higher pulling loads.