group 7/8 32 A plug has its L and N pins at 9 o'clock and 3 o'clock, while the group 1/2 20 A plug has its L and N pins at 10 o'clock and 2 o'clock instead.) There are also metal clad plugs and sockets that go up to 63 A ratings, at a significantly higher cost. See also Domestic AC power plugs and sockets Double insulated Electricity Electrical power Ground and neutral Protective multiple earthing SAE J1772 - Single phase AC and optional DC Electric Vehicle charging Type 2 connector - Three phase AC and optional DC Electric Vehicle charging References External links Mains power connectors Electrical wiring