YJV22 Copper Wire XLPE Insulated STA  Armoured PVC Sheath Power Cables. The structurer is CU/XLPE/PVC/STA/PVC, includes the Copper Wire Condutor, XLPE Insulation, PVC Inner Sheath, Steel Tape Armoured, PVC Out Sheath. STA armoured cable is a steel tape armored cable. It is a kind of armored cable. It is usually used for transmission lines below 35KV. The steel tape armored cable has a metal armor layer in the cable sheath, which is mainly used to prevent the cable is damaged by external squeezing.