Plug and socket Plugs for electrical appliances lead the brigade to take power connector pieces. Plug type, national standards for the flat pins, old-fashioned ring-pin plug has been eliminated, in particular, the following clever A round-pin plug, and a ban on the production there. In order to ensure the safe use of electricity, in addition to insulation shell and low power supply of electrical appliances can use two-wire plug, the other metal and can touch the metal parts of electrical appliances should be fitted with a ground plug. Socket distinct style, dark and mobile three types, each with a more stringent requirement of a large class but a variety of types of devices. China plug socket type, according to national standards GBI (X) 2 a GBI 1980 and 1950 meter requirement is the old 3-flat, and where non-national standard type of plug and socket are not the production, Plugs and sockets are divided into single-phase two, phase three and phase four-pole three. Operating voltage of 50V, 250V and 3 that V. (L) Ming-mounted socket: Ming-mounted socket outlet that is common for the Qi surface wiring installation. (2) Dark Tower-mounted Challenge: Dark-mounted socket known as an embedded socket for installation of buried in the walls of the lighting circuits for the power connection devices. Than that pretty much mounted socket, so in modern architecture is widely used in electrical fittings. (3) Block Challenge Mobile: mobile socket derived species, its functional sub-connections, power splitter, plug Mindanao conversion of three. Its characteristics are nothing more than move and live parts with a soft cable.