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> Neat, and totally impossible in the U.S. Not to mention the whole
> polarized plugs thing.
In the UK too. In fact the whole system is polarized, the "neutral" pin of
the AC is always connected to Earth at the substation, so essentially one
pin is always close to Earth voltage and the other carries the AC signal.
This means that some equipment might be designed only to switch the "live"
side, if it was then connected the "wrong" way round, it could be very
dangerous. Nowadays I suspect nothing is actually wired like that, given
that it's always possible someone uses an adaptor, takes it abroad and then
gets electrocuted!
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