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Does anyone have information on earth leakage circuit breakers used in
South African mines around 1950?
Your help will be appreciated. Creighton

Here is a paper on the development of earth leakage circuit breakers from a South African perspective.
http://www.cbi.co.za/papers/24/CBI2.pdf

Thanks, C-H. That is just the ticket.
Creighton

That's an excellent bit of technical history. It throws a new light on things we now take for granted.

It does indeed, I find these historical summaries of certain devices or practices to be very illuminating.