The so-called main line refers to the two main wires between the main power supply and all electrical appliances. The main wire must be made of coarse copper core wire, as it carries the charge of various electrical appliances and requires high-performance coarse copper wire. The bypass can choose multi-core wires.

Electric wires refer to wires that transmit electrical energy. Divided into bare wire, electromagnetic wire, and insulated wire. Bare wires have no insulation layer, including copper and aluminum flat wires, overhead stranded wires, and various profiles (such as profile wires, busbars, copper bars, aluminum bars, etc.). It is mainly used for outdoor overhead and indoor busbars and switch boxes.