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I've bought a rcd/mcb for a 8.5kw shower I've fitted, it says it is a c/w 2 pole, 63amp, 30mA rcd and 1x40amp mcb. What does the c/w mean and does the 63amp mean it will only take 63amps? All replies greatly appreciated.

I had a 7kw shower and I've upgraded it to a 8.5kw shower. I've changed the wiring from 6mm to 10mm, the old shower unit had a seperate supply from the cu with a 30A fuse. My new shower is 40A but I can't use it at the moment as I've bought a RCD with a 40mcb, but I can't isolate the tails from...

My electricity supplier is scottish power, I contacted them to ask for an isolator to be fitted after the meter so I could isolate my consumer unit from the main incoming supply so that I can update my cu from rewirable fuses to mcb's. They were very unhelpful and passed the buck to united...