单相三孔插座如何安装才正确？为什么？
How to install single-phase three hole socket correctly? Why?
通常，单相用电设备，特别是移动式用电设备，都应使用三芯插头和与之配套的三孔插座。三孔插座上有专用的保护接零（地）插孔，在采用接零保护时，有人常常仅在插座底内将此孔接线桩头与引入插座内的那根零线直接相连，这是极为危险的。因为万一电源的零线断开，或者电源的火（相）线、零线接反，其外壳等金属部分也将带上与电源相同的电压，这就会导致触电。
Generally, three core plug and three hole socket should be used for single-phase electrical equipment, especially mobile electrical equipment. There is a special protective zero (ground) Jack on the three hole socket. When adopting the zero connection protection, someone often only connects the terminal head of this hole with the zero line led into the socket directly in the bottom of the socket, which is extremely dangerous. In case the zero line of the power supply is disconnected, or the fire (phase) line and zero line of the power supply are connected reversely, the metal parts such as the shell will also carry the same voltage as the power supply, which will cause electric shock.
因此，接线时专用接地插孔应与专用的保护接地线相连。采用接零保护时，接零线应从电源端专门引来，而不应就近利用引入插座的零线。
Therefore, the special grounding jack shall be connected with the special protective grounding wire when wiring. In case of zero connection protection, the zero line shall be led from the power supply end, instead of the nearest zero line leading into the socket.