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Electrical plug and socket. Close-up of a 3-pin 13 Amp electrical plug next to a socket. The plug connects domestic appliances and tools to the electricity supply when placed into the socket. The plug has three flattened pins: an upper earth (ground) pin (at upper centre) and a lower pair of live and neutral pins (with black bands). (KEYSTONE/SCIENCE PHOTO LIBRARY/CORDELIA MOLLOY)