AC has no "polarity" (Well, the "polarity" is reversed 100 times per second.)
Connecting the Line and Neutral the correct way round is important if "Edison Screw" Lamps are used.
If "Bayonet" Lamps are used it does not much matter.
there are 730% MORE people die in the UK each year from slipping in the bath than are killed by electrocution in the home.
Perhaps we need a bath warning....
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