There is a high possibility of errors in the wiring of switches and sockets in actual construction. Therefore, in addition to strictly implementing the differentiation regulations of using light blue wires for neutral wire N, green/yellow dual color wires for ground wire, and yellow, green, and red wires for phase lines U (LI), V (L2), and W (L3), it is also essential to conduct careful and scientific inspections after wiring. In addition to strictly implementing the regulations on phase and color discrimination during construction, the focus is on using socket inspectors for full inspection and opening sockets (usually at a 10% ratio for spot checks) to check the quality of wire connections.

The wiring of the switch socket should not only be correct, but also reliable. According to relevant standards, the wiring terminals of the socket should be able to reliably connect one or two wires of 1-2.5mm (1OA socket), 1.5-4mm , 2.5-6mm, and 4-8mm (40A socket).