Wire and cable conductor consists of four parts, the insulating layer, a shield layer and a protective layer. (1) of conductors is a conductive portion of the wire and cable for conveying electric power, a major part of the wire and cable. (2) the insulating layer is an insulating layer between the earth and the different phases of conductors and electrically isolated from each other to ensure power transmission, wire and cable constructions are an indispensable component. (3) shield wires and cables 15KV and above generally have conductor shield and insulation shield. (4) the protective layer of the protective layer is to protect the wires and cables from external impurities and moisture intrusion, and to prevent direct damage to the external power cable.