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This plug and receptacle is technically known as the BS 1363 (British 13 A/230-240 V 50 Hz earthed and fused).
This plug, commonly known as a "13-amp plug", is a large plug that has a fuse inside, for protection, in addition to whatever protection might be provided at the distribution panel. The fuse is required to protect the cord, as British wiring standards allow very high-current circuits to the socket. Accepted practice is to choose the smallest standard fuse (3 A, 5 A, or 13 A) that will allow the appliance to function. The fuse is 1 inch long, conforming to standard BS 1362.
UK wiring regulations require sockets in homes to have shutters over the live and neutral connections for safety reasons (e.g. to prevent children from inserting metal objects into them). These are incorporated into all BS 1363 sockets and are opened by the insertion of the (longer) earth pin. The shutters also help prevent the use of plugs made to other standards. On plugs that do not require an earth, the pin is often plastic and serves only to open the shutters and to enforce the correct orientation of live and neutral. It is sometimes possible to open the shutters with a screwdriver to insert Type C Plugs or other plug types. This is not advisable, as such plugs will not have a fuse and will often not fit properly.
BS 1363 plugs and sockets started appearing in the late 1940s. By the end of the 1950s, it had replaced the earlier Type D standard in new installations. By the end of the 1960s, most earlier installations had been rewired to Type G. Receptacles usually include switches on them for convenience and safety.
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