Mineral insulated cables are referred to as MI cables. When used for wiring, they are commonly known as mineral fireproof cables and mineral cables in China. Mineral insulated cables are composed of mineral insulating materials, copper cores and copper and other metal sheaths. In addition to good mechanical and physical properties, electrical conductivity and fire resistance, this cable also has good non-combustibility. In the event of a fire, this cable can not only ensure the firefighting power supply during the duration of the fire, but also does not produce toxic smoke, which can delay the fire.