Armoured Cable or SWA (steel wired armoured) cable is commonly used in underground installations. The Armoured cable can be buried into the ground or fixed to outdoor walls using cable cleats. The cable is protected from damage by the galvanised steel wire.
Armoured cable comes in many different sizes, for domestic wiring 2 and 4 core is used. The conductor cores ranges from 1.5mm for lighting circuits and up 16mm for heavy loads.