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oh god yes, if this had been an "upgrade" situation rather than a breakdown,i would be very unhappy right now, at the amount of work required !

Well it seams the old cable is in very small space, not enough space to pass a second cable down in! The cable has been secured to the wall behind the small cavity, so its time to- *remove the tiles *cut the pasterboard out *remove cable *insert new cable *put paster back *re-tile...

yes shower had simply worn out, one of the heating elements didnt work, isolation switch had heat damage around one of the poles, and when i tested it, even when off was allowing some current across. Cables still in the wall, going to be a right pig to get it out, and get new cable in place...

I was proved right. the old existing cable is faulty. With a new bit of cable between the isolation switch and shower, everything was fine. Now just need to get the old cable out of the cavity and feed the new one in... Any tips or suggestions on doing that to make it a bit easier..??? Its...

Booked a local electrition to come :) Im past the point where i can do stuff now!

So i didn't explicitly say the old shower was faulty, my mistake, i assumed the most people would realise someone swapping one item for an identical one, does so for a reason. The old shower had started to trip the rcd intermittently (once or twice) and one of the heating elements had...

Sorry i didnt make myself clear, the rcd trips the second the isolator switch is turned on , which give me (an idiot) the idea that the cable as suggested is at fault.

Yes it was. Its been left connected for time. It was gone 11pm, with small people sleeping. Yes the cord is removed from the switch. While i understand the principles of such testing, i lack equipment to test at a sufficient voltage. Overnight have decided to replace the suspect cable...

the cable in place has stranded earth, so its pretty much impossible to get neutral and earth confused. (t&e)

No its not going to get used!! The mcb is set to off, the isolation switch is off, with the cable removed so people cant turn it on, and the switch on the front of the shower is disconnected. No ones going to be using the shower till its sorted out! Have thought about replacing the cable...

Ok i have replaced a 8.5kw shower with another 8.5kw shower. its running on 10mm cable, on a 40amp mcb, the isolation switch is 45amps. When the shower was replaced, the rcd on the cu kept tripping the instant it was turned on. So after looking about, the isolation switch was found to be a...