Armoured cable, sometimes called SWA cable, is made with an outer of steel wire armouring around, copper conductors and XLPE insulation. More commonly used as cable for exterior installations, with its protective metal cover to protect it from accidental damage, extremes of temperature and water, it can also be used both indoors. However it is Outdoor electrical cable designed to supply mains electricity and to be used in cable ducting, power networks and underground systems as well as powering residential homes. Armoured electrical cable insulating material is resistant to chemicals and is heat stable so it is ideal for many outside wiring applications. You can buy Steel wire armoured cable in a range of lengths, conductor sizes and cores.