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According To The Voltage Level Jan 12, 2017

1, low-voltage cables: suitable for fixed laying 50Hz, the rated voltage under 3kV on transmission and distribution lines for transmission purposes.

2, medium voltage cables: (generally refers to 35KV and below): PVC insulated cables, xlpe insulated cables, xlpe insulated cables.

3, high-voltage cable: (generally 110KV and above): polyethylene cables and xlpe insulated cables.

4, extra high voltage cables: (275~800 kV).

5, special high-voltage cable: (1 million volts and above).

Former is the control cables, low voltage, fine lines, some shielding. Which are low voltage and high wire is thicker.