... in the environment, like outside, indoor, underground and tunnel for power transmission and so on. StandardNational Standard GB/T 12706-2002 ... (Um=3.6kV), 6kV (Um=7.2kV), up to 30kV (Um=36kV)UseThe power cables can be fixed in the environment, like ... outside, indoor, underground and tunnel for power transmission and distribution project with above voltages. Power Cable for Voltage from 1kV (Um=1 ...