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.