The plug is composed of a socket and a plug. When using, the following precautions should be taken: (1) The socket should not be installed in high temperature and humid places, but should be installed in a dry and clean place; The height of exposed sockets from the ground should not be less than 1.8 meters, and the height of concealed and industrial sockets from the ground should not be less than 30 centimeters. (2) The rated current of the plug should be greater than the load current; Sockets with different voltages should have obvious differences to prevent them from being interchangeable. (3) For sockets used in portable or mobile electrical equipment, single-phase sockets should use three hole sockets, three-phase sockets should use four hole sockets, and their grounding holes should be firmly connected to the grounding wire or neutral line. (4) Sockets in children's activity areas should use safety sockets; If using a regular socket, the installation height should not be less than 1.8 meters. Figure 1 Common Errors in Using Plugs Figure 1 Common Errors in Using Plugs (5) Do not allow two or more electrical appliances to use a single plug or two pairs of plugs to be inserted together in a single socket (as shown in Figure 1 (a)) to prevent short circuits or burning of electrical appliances. (6) It is prohibited to directly insert the wire ends of the two power leads of the electrical appliance into the socket (as shown in Figure 1 (b)) to avoid short circuits or electric shock accidents. (7) After the bolt is damaged, it must be replaced in a timely manner and cannot be used interchangeably. (8) Regularly check whether the plug is intact and whether the wire ends of the plug or socket are loose. (9) The plug should be inserted to the end of the socket and should not be exposed (as shown in Figure 1 (c)) to avoid electric shock. [2]