User:Deucharman/sandbox
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AC power plugs and sockets are devices that allow electrically operated equipment to be connected to the primary alternating current (AC) power supply in a building. Electrical plugs and sockets differ in voltage and current rating, shape, size and type of connectors. The types used in each country are set by national standards, some of which are listed in the IEC technical report TR 60083, Plugs and socket-outlets for domestic and similar general use standardized in member countries of IEC.[1]
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Plugs and sockets for portable appliances originated in the 1880s in Britain and were initially two pin designs. These were usually sold as a mating pair, but gradually defacto and then official standards arose to enable the interchange of compatible devices. Co-ordination of technical standards has allowed some types of plugs to be used over wide regions to facilitate trade in electrical appliances, and for the convenience of travellers and consumers of imported electrical goods. Although there are a number of different national standards in mainland Europe, and significant differences in the methods used for earthing, most of them have a 19 mm spacing between the centres of the current carrying pins.