This product is a new cable with seamless copper tube sheath and magnesium oxide crystal powder as insulation material in the middle. The conductor is a single copper rod. It has high temperature resistance, fire prevention, explosion-proof, non-combustion (250℃ can be continuous long time operation, 1000℃ limit state can also make 30min short time operation) and large discharge, small outer diameter, high mechanical strength, long service life, anti-ant, anti-rat bite, copper sheath protection grounding wire and other characteristics.