The main characteristics of this type of product are: extruding (winding) an insulating layer around the conductor, such as overhead insulated cables, or twisting several cores (corresponding to the phase, neutral, and ground wires of the power system), such as overhead insulated cables with more than two cores, or adding a protective layer, such as plastic/rubber sheathed wires and cables. The main process technologies include drawing, stranding, insulation extrusion (wrapping), cabling, armor, and sheath extrusion. The different process combinations of various products vary somewhat. The product is mainly used for the transmission of strong electric energy in power generation, distribution, transmission, transformation, and power supply lines, with high current (tens to thousands of amperes) and high voltage (220V to 35kV and above).