Re: Old case with electrical odds and ends.
I remember seeing 2 pin, 15 amp outlets installed in an old large country house.
The premises originaly had no grid supply but was reliant on private generating plant and a battery bank, at a nominal 110 volts DC.
AFAIR, the lighting circuits, including both fixed lights and 2 amp lighting sockets were live 24/7, from the battery when the engine was not running.
The 15 amp sockets were designated "power" and only energised when the engine was running, so as to avoid excessive load on the battery.
The lighting circuits had a regulated voltage, the power outlets would vary a bit according to conditions, probably up to 150 volts when the dynamo was charging the battery, and the battery was nearly full..
The prime mover was probably a steam traction engine originaly, but a diesel had been fitted.
When I viewed the installation in about 1975 it had only recently been taken out of use.
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