wrote in message
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On Sat, 10 Nov 2018 15:33:18 -0000, "Steven Watkins"
wrote:

Why do houses have a switch to turn the shower off, either a cord on the
ceiling or a switch in the hall?

Can't be for safety - if you're in the shower and get a shock, if you've
managed to get out to reach the switch, you've got away from it anyway.

Can't be to isolate to work on it, there's a fusebox for that.

Don't need to turn it off when you're finished showering, there's a switch
on the shower itself.

What is "electric" in the shower in the first place?

Heating the water.