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Hi all, have an electric shower downstairs next to a utility room where the consumer fuses are, the shower has a 45amp mcb (on 10mm cable) which is also used to isolate shower when not in use. My question, is it ok to use like this or doe's there have to be an isolation switch in between the shower unit and the mcb, we do switch off at the mcb when shower is not in use. Thanks for your time.