The mains voltage is the electrical voltage supplied by utility companies via the power grid to transmit electrical power. Mains voltage can be realised as low or high voltage, depending on the power transmitted, whereby the latter subdivides into medium, high, and maximum voltage.
- As three-phase current, as well as alternating voltage (up to 1,000 volts), and direct voltage (up to 1,500 volts)
- Over 1,000 volts (1 kV), typically for low-loss transmission of electrical energy
- Further subdivision into medium voltage (3, 6, 10, 15, 20, 30 kV in industrial enterprises and towns), high voltage (60 kV, 110 kV in cities and smaller power stations), and maximum voltage (220, 380, 500, 700 kV for meeting the requirements of major metropolitan areas and large power stations)