The conductor is made of twisted strands of copper wire with good bending characteristics. A high temperature resistant, not burning inorganic insulation materials, synthetic mica tape and heat-resistant can reach 1050 ℃, metallic sheath use high conductivity copper materials, special processing by the rolling ground with good bending properties, and can be used as the PE line, outer sheath with low smoke zero halogen flame retardant polyolefin material, good anti-corrosion properties, some occasions without outer sheath.