Editing Ring circuit (section)

==History and use==
The ring [[electrical network|circuit]] and the associated [[BS 1363]] plug and socket system were developed in Britain during 1942–1947.<ref name=Mullins>Malcolm Mullins: [http://electrical.theiet.org/wiring-matters/18/plug-origin.cfm?type=pdf The origin of the BS&nbsp;1363 plug and socket outlet system] {{Webarchive|url=https://web.archive.org/web/20160303213209/http://electrical.theiet.org/wiring-matters/18/plug-origin.cfm?type=pdf |date=2016-03-03 }}. IEE Wiring Matters, Spring 2006.</ref>  They are commonly used in the [[United Kingdom]] and to a lesser extent in the [[Republic of Ireland]]. They are also found in the [[United Arab Emirates]], [[Singapore]], [[Hong Kong]], [[Beijing]], [[Indonesia]] and many places where the UK had a strong influence, including for example Cyprus and Uganda.

Pre-[[World War II]] practice was to use various sizes of plugs and sockets to suit the current requirement of the appliance, and these were connected to suitably fused radial circuits; the ratings of those fuses were appropriate to protect both the fixed wiring and the flexible cord attached to the plug.

The Electrical Installations Committee which was convened in 1942 as part of the Post War Building Studies programme determined, amongst other things, that the ring final circuit offered a more efficient and lower cost system which would safely support a greater number of sockets.<ref name=latimer>D.W.M. Latimer: History of the BS&nbsp;1363and the ring circuit. [http://www.theiet.org/resources/wiring-regulations/ringcir.cfm?type=zip Presentation papers from a public meeting to discuss the issue of ring circuits], [[The Institution of Engineering and Technology|IET]], London, October 2007 (PDF in ZIP)</ref><ref>{{Cite web| title=BS 1363 plug and socket-outlet | url=https://electrical.theiet.org/media/1688/the-origin-of-the-bs-1363-plug-and-socket-outlet-system.pdf | archive-url=https://web.archive.org/web/20200818142129/https://electrical.theiet.org/media/1688/the-origin-of-the-bs-1363-plug-and-socket-outlet-system.pdf | archive-date=2020-08-18}}</ref>  The scheme was specified to use 13&nbsp;A socket-outlets and fused plugs; several designs for the plugs and sockets were considered. The design chosen as the British Standard was the flat pin system now known as BS&nbsp;1363.  Other designs of 13&nbsp;A fused plugs and socket-outlets, notably the [[AC power plugs and sockets: British and related types#Wylex plug|Wylex]] and [[AC power plugs and sockets - British and related types#Dorman .26 Smith .28D.26S.29|Dorman & Smith]] systems, which did not conform to the chosen standard, were used into the 1950s, but by the 1960s BS&nbsp;1363 had become the single standard for new installations.

The committee mandated the ring circuit both to increase consumer safety and to combat the anticipated post-war [[copper]] shortage. The committee estimated that using ring-circuit and single-pole fusing would reduce raw materials requirements by approximately 25% compared with pre-war regulations.<ref name=Mullins />{{rp|7}}

The ring circuit is still the most common mains wiring configuration in the UK, although both  20&nbsp;A and 30&nbsp;A radial circuits are also permitted by the Wiring Regulations, with a recommendation based on the floor area served (20&nbsp;A for area up to 25&nbsp;m<sup>2</sup>, 30&nbsp;A for up to  100&nbsp;m<sup>2</sup>).