Standard We produced according to National Standard of GB/T 22078.2-2008 of the Peopleâ??s Republic of China. Â Range of application It is suitable for single-core cableâ??s installation and operation under normal conditions of rated voltage 290/500 KV, but it is not suitable for cable in special use, such as submarine cable. Characteristics of XLPE cable Rated voltage of cable is U0=290 KVã??U=500 KVã??Um=550 KV. The allowable maximum temperature of cable conductor is 90â?? when it runs in normal, and 250â?? when it short circuited (Longest time is 5 s).