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Bobbo-
that sounds fun..
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@Airhead or someone else who knows, isn't that what's called "dirty" wiring?
I thought it looked like Aluminium cable which was popular late sixties early seventies if I remember correctly. I've only worked on one or two places with that type. In my small sample set they seem to be vulnerable to wires working loose in connectors.
The figures for capacitance are different but it would be susceptible to breakdown in the insulation at that age. An insulation resistance test would give you an idea of the condition.
apc
Airhead
Am surprised the dimmer worked normally though?
Cables look a bit old too 😣