all dialectic,non-metal,lightning proof;easy for wiring installatin & maintenance(even when the wire is live),small expansion coefficient,tolerate a wide range of temperatures;intertwisted with the aramid fibre of balance of torsion moment,the cable is spring-proof and of relatively high tensile strength;small cable diameter,reduce ice and wind load,suitable for stable transmittance;voltage grade is 220kv and below;apan is 500m and below;make use of the previous main line of electric power.