Editing AC power plugs and sockets (section)

=== UK Walsall Gauge plug ===
[[File:WG13 PICT6943.jpg|thumb|upright=0.85|Walsall Gauge 13&nbsp;A plug (bottom) compared to regular BS&nbsp;1363 plug]]

Unlike the standard BS&nbsp;1363 plugs found in the UK, the earth pin is on a horizontal axis and the live and neutral pins on a vertical axis. This style of plug/socket was used by university laboratories (from batteries) and the [[BBC]], and is still in use in parts of the [[London Underground]] for 110&nbsp;V{{spaces}}AC voltage supply.<ref>{{cite web |url=http://www.plugsocketmuseum.nl/British2.html |title=Non-standard BS 1363 types |work=Museum of Plugs and Sockets |access-date=3 November 2019}}</ref> In the 1960s they were used for 240&nbsp;V&nbsp;DC in the Power laboratory of the Electrical Engineering department of what was then [[Cardiff University|University College, Cardiff]]. Power was supplied by the public 240&nbsp;V&nbsp;DC mains which remained available in addition to the 240&nbsp;V&nbsp;AC mains until circa 1969, and thereafter from in-house rectifiers. They were also used in the [[Ministry of Defence Main Building]] inside circuits powered from the standby generators to stop staff from plugging in unauthorized devices. They were also known to be used in some [[British Rail]] offices for the same reason.
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