In general, one electric shower per house. Most houses have a 23kw supply, some are less. This is for everything in your house. If two electric showers were fitted, some kind of interlock would be needed to stop them becoming energised together.
Dont forget to tell building control about your DIY electrical work under Part P.
I might have read it wrong.
Indeed, 10mm² has a stranded earth, 6mm is solid earth.
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