Quote:
it ensures that the outside screw conductor of a standard light bulb socket will not be connected to the hot voltage wire.


Ah, see, there's another cultural difference. In the UK, our light fittings/ceiling roses/etc. tend to be bayonet-fit, which means they have both conductors on pins inside the fitting.

Even the screw fit ones tend to have a plastic shell on the outside, so you have to put your finger in the fitting.
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-- roger