Naked steel tape armoring or plastic sheathed cables are generally used for open - applied cables. In areas vulnerable to corrosion, the use of plastic cladding. When the steel tape armored cable is needed, it is advisable to choose the secondary outer sheath type.When laying directly, steel tape armored cable is usually used. In areas of wet or corrosive soil, plastic cladding should be provided. Other areas can choose jute outer sheath.In addition to oil-filled cables, power cables are generally three-core aluminum cables.