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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 .
The innovation that made ring circuits feasible in the UK was the introduction of plugs that contained their own fuse. There were three competing designs but only one ultimately survived and became the version specified in British Standard 1363. BS1363 plugs, could historically be fitted with a range of fuses up to 13A though only the 3A and ...
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 ...
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 ...
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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). The pin length is the same as in the Chinese version.
Four main styles of crimps are specified by AMP: "F" Crimp for use on non-insulated connectors; TETRA-CRIMP for use on insulated PIDG and PLASTI-GRIP connectors "C" Crimp, typically used for flag connectors (where the wire enters the connector perpendicular to the direction of tab insertion) Tab-Lok, typically used for flag connectors