1 Maximum rated temperature The maximum operating temperature of cores shall not exceed 90 When the cable is used for long period. The temperature of core shell not exceed 250 at short circuit for 5 seconds. 2 2 Installation requirement The installation of cable is not limited by the difference of level along the route. The ambient temperature should not be below 0 during installation. The minimum bending radius shall not be less than 10 times of the cable overall diameter when laying For single core cable used in AC the cable without Armour or the cable with steel wire Armour is required, which shall not be laid in magnetic duct.