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Old 4th Mar 2012, 4:51 pm   #92
julie_m
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Join Date: May 2008
Location: Derby, UK.
Posts: 6,531
Default Re: Another unusual plug and some other questions

I believe they were designed to go with special switched sockets that only allowed a plug to be inserted or withdrawn with the switch off (perhaps for DC use?) A restrictor plate clamped the earth pin while the switch was on, and also prevented the insertion of a plug in that state (but in case anyone tried, the live pins were partly sleeved so the portion sticking out of the socket would be safe).
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