Editing AC power plugs and sockets (section)

==== BS 546 and related types (Type D and M)<span class="anchor" id="Type D"></span><span class="anchor" id="Type M"></span> ====
[[File:BS 546 Plugs - 15A 5A 2A.png|thumb|BS&nbsp;546 plugs. Left to right: 15&nbsp;A, 5&nbsp;A and 2&nbsp;A.]]

<!--editors: Additional details should be added to [[AC power plugs and sockets - British and related types]].-->
BS 546, "Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors for AC (50-60&nbsp;Hz) circuits up to 250&nbsp;V" describes four sizes of plug rated at 2&nbsp;A, 5&nbsp;A (Type&nbsp;D), 15&nbsp;A (Type&nbsp;M) and 30&nbsp;A. The plugs have three round pins arranged in a triangle, with the larger top pin being the earthing pin. The plugs are polarised and unfused. Plugs are non-interchangeable between current ratings. Introduced in 1934, the BS&nbsp;546 type has mostly been displaced in the UK by the BS&nbsp;1363 standard. According to the IEC,<ref name="iec">{{cite web |title=World Plugs |url=http://www.iec.ch/worldplugs/list_bytype.htm |url-status=dead |access-date=27 August 2014 |website=International Electrotechnical Commission (IEC) |archive-date=25 October 2014 |archive-url=https://web.archive.org/web/20141025174324/http://www.iec.ch/worldplugs/list_bytype.htm}}</ref> some 40&nbsp;countries use Type&nbsp;D and 15&nbsp;countries use Type&nbsp;M. Some, such as India and South Africa, use standards based on BS&nbsp;546.