Is there a convention or rule on which wires should be should be connected to the top and which to the bottom of the main switch (etc) in a consumer unit?
This reminded me of an old lever switch taken out of our house when it was
rewired in the 1970s. I thought it was a double pole on off switch, but as
I found out on measuring it, when the mains in was isolated, a fraction of a
second later the earth live and neutral of the house wiring were shorted
together. I don't thing this is still done, as the old switch dated from
1939, and was seemingly in a die cast metal case with the lever on the side.
Very well made inside, all ceramics.
Don't make em like that no more, as a friend said.
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