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Diagram of a possible configuration of ring final circuit. Consumer unit is at bottom left. The ring starts at the consumer unit (also known as fuse box, distribution board, or breaker box), visits each socket in turn, and then returns to the consumer unit. The ring is fed from a fuse or circuit breaker in the consumer unit.
In the United Kingdom and in Ireland, this system is usually referred to simply as a "13 amp plug" or a "13 amp socket". BS 546 , Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors for AC (50–60 Hz) circuits up to 250 V is an older British Standard for three-pin AC power plugs and sockets .
In an electrical power distribution system, a ring main unit (RMU) is a factory assembled, metal enclosed set of switchgear used at the load connection points of a ring-type distribution network. It includes in one unit two switches that can connect the load to either or both main conductors, and a fusible switch or circuit breaker and switch ...
Ring (or ring final) A ring final circuit is similar to a radial except what would be the end of the circuit instead loops back to the source protective device in the distribution board. Thus each individual conductor, line, neutral and earth, actually forms a loop (or ring), from the source, out, and back around to the source again. This has ...
There are many uses to be found over the intervening years, one example of which can be found at the bottom of page 14 of D.W.M. Latimer's "History of the 13 amp plug and the ring circuit." (as referenced in the main article) where Mr Latimer quotes a passage from a committee memorandum (from 1943) which includes the phrase "Two standard plug ...
00:13, 22 November 2022: 940 × 477 (1.73 MB) Bamboofirdaus: Indonesia uses Schuko plug and socket: 20:49, 5 September 2021: 940 × 477 (1.72 MB) Themanlk: Update Sri Lanka: 04:19, 12 March 2021: 940 × 477 (1.72 MB) A Tree In A Box: Reverted to version as of 12:04, 17 July 2020 (UTC) Map was broken, only showed Peru France Belarus and Sri ...
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It has an earthing pin and two flat current-carrying pins forming an inverted V-shape (120°). The flat pins for the 10 A version measure 6.25 by 1.55 mm (0.246 by 0.061 in) and 8.0 by 1.9 mm (0.315 by 0.075 in) for the 20 A version, and are set at 30° to the vertical at a nominal pitch of 7.92 mm (0.312 in).