1, low voltage cable: suitable for fixed laying in AC 50Hz, rated voltage 3KV and below the power transmission and distribution lines for transmission electricity. 2, medium and low voltage cables :(generally refers to 35KV and below): PVC insulated cable, PE insulated cable, XLPE insulated cable, etc. 3, high voltage cable :(generally 110KV and above): polyethylene cable and XLPE insulated cable, etc. 4, ultra high voltage cable :(275~800 kv). 5, ultra high voltage cable :(1000 kv and above).