Product Name 66-500KV XLPE Power Cable Construction Standard IEC 60840 rated voltage 30KV（Um=36KV）and above to 150KV（Um=170KV）extruding insulation power cable and accessories-test meathod and requirement IEC 62067 rated voltage 150KV（Um=170KV）and above to 500KV（Um=550KV）extruded insulation power cable and accessories-test meathod and requirement Operating Environment Max admissible temperature for conductor: 90℃ under normal running condition; 250℃ under short circuit ( max. duration is 5s ) Min bending radius is recommended to be 20 times of cable overall diameter. PVC sheathed cables shall not be installed in the environment temperature is below 0 ℃， and if it is below 0℃, the cable should be heated before installation Metal sheath Cable with corrugated aluminum sheath: places where there is not much corrosion but much requirement for mechanical strength ( e.g. direct connection to transformers, laying on bridges and in certical shafts ) Plastic Outer Sheath Cable with PVC outer sheath (type02) are suitable for the high voltage cable transmission line with general fireproof requirement and somewhat insulation requirement on the outer sheath. Cables with PE outer sheath (Type03) are suitable for high voltage transmission line directly buried underground with higher insulation requirement on the outer sheath; and if they are laid in tunnels or vertical shafts, anti-fire and flame-retardant measures must be taken.