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Old 17th Sep 2019, 11:05 pm   #5
emeritus
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Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,316
Default Re: Apprentice's electrical notes

Some interesting wiring arrangements. Away from home at present so viewing on the rather small screen of my phone, must have a detailed look when I get back home. Many of the luminaries and fittings look like those in the 1911 GEC catalogue. Some interesting things at page 26 on, not only a 3 pin plug used in the modern way to provide an earth, but also the use of 3 pin plugs on unearthed arrangements where the plug connects two independently switched lights, each connected by 2 core flex to the plug, the centre contact being common, the other two socket contacts being connected to the mains via respective switches. I recall that the original patent for the Lindstrom 3 pin plug only describes its use with three core cable to allow a table lamp to be controlled by its own switch or a wall switch at the socket, although wiki's AC power plugs does not mention this fact and only refers to its (subsequent) use as a conventional earthed plug.

Last edited by emeritus; 17th Sep 2019 at 11:17 pm.
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