Household sockets on the market, including single-phase two-pole flat-hole sockets and single-phase three-stage flat-hole sockets. The round hole socket has been eliminated. Therefore, the choice of power outlet should be a single-phase two-pole flat hole socket or single-phase three-stage flat hole socket. The two-hole socket has only the phase line and the neutral line terminal; the three-hole socket has three terminals of the phase line, the neutral line and the ground line. If the two-hole socket is installed horizontally, it is usually specified that the wiring method is "left zero right phase"; if it is a facade installation, "upper zero phase". The three-hole socket is grounded with a large hole, "left zero right phase".
Mobile multi-hole sockets should also be wired as described above. When multiple appliances share a porous socket, care should be taken not to exceed the capacity of the socket leads to prevent the wires from overheating.
A four-hole socket should be used when using a 380 volt power supply in the home. The large hole is grounded, and the three holes are connected to each other.
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