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.

Electromagnetic wire is an insulated wire that generates a magnetic field after being energized or induces current in the magnetic field. It is mainly used for winding motors and transformers, as well as other related electromagnetic equipment. Its conductor is mainly copper wire, which should have a thin insulation layer and good electrical and mechanical properties, as well as heat resistance, moisture resistance, solvent resistance, and other properties. Choosing different insulation materials can achieve different characteristics.