1. The products of wires and cables used in power system of power system mainly include overhead bare wires, bus bars (buses), 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 bus wires), electromagnetic wires and electrical equipment wires and cables for power equipment. 2. The wires and cables used for information transmission system mainly include local telephone cables, TV cables, electronic cables, radio frequency cables, optical fiber cables, data cables, electromagnetic cables, power communication cables or other composite cables. 3. This part of instrument system is applied to almost all products except overhead bare wires, but mainly power cables, electromagnetic cables, data cables, instrument cables, etc.