The wire and cable products used in the power system mainly include overhead bare wires, bus bars (bus bars), power cables (plastic cables, oil-paper power cables (basically replaced by plastic power cables), rubber sheathed cables, overhead insulated cables), branch cables (replacing part of the bus bars), electro-magnetic wires and electrical equipment wires and cables for power equipment. 2. Information transmission system The wires and cables used for the information transmission system mainly include local telephone cables, television cables, electronic cables, radio frequency cables, optical fiber cables, data cables, electromagnetic cables, power communication cables or other composite cables. 3. Mechanical equipment, instrumentation system This part is applied to almost all other products except overhead bare wires, but mainly power cables, electromagnetic cables, data cables, instrument cables, etc.