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Thanks for the info. Worked first time

Made a mistake in my original note. Should have read 8.5kw. Does same apply. It's the RCD that is tripping not the MCB.

I have installed an electric shower 9.5 kw using 10mm2 cable on a run of approx 12 metres and 40amp MCB. When I turn on the isolating switch eveything seems ok but as soon as I turn the shower on the RCD trips. I have added an additional earth cable from the shower to the consumer unit (Seaboard...