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Thanks, but it was the original 7.5kw shower that started tripping the RCD 6 weeks ago. The 9kw was fitted just a week ago because I was originally told that the shower unit was the cause and should be replaced, so I think the 9kw is a red herring. So, the 7.5kw shower burnt out the neutral, not...

...........and the winner is........ Circuit tested by electrician. Neutral burnt out in isolator switch. Isolator replaced. Spot on Nozspark. Thanks.

Hi Sorry, I don't know what that means :oops: How would I find that out?

I haven't as I haven't had time yet, but I'm not sure what it would demonstrate if I did?

I am sorry to see that this thread seems to have descended into a flame war. The RCD starting tripping recently after 5 years of continual use of a 7.5kw shower. The shower was replaced and the tripping continues. The problem therefore must be with the circuit, the isolator switch or a leaky...

Thanks for this. I think you may have cracked it. I bet the plumber didn't check that and probably just used the old fitting, assuming as we both did that it was the shower unit at fault. Thank you. I appreciate your help on this.

Thanks but please hold back on patronizing me. I didn't fit it. It was fitted by a qualified plumber after I had asked a qualified electrician that wired the house whether 6mm cable would support a new 9kw shower. HE said that it would. Please don't assume that this was MY doing!!!!! Can...

Yes, a neon pull cord isolator switch in the ceiling. It trips only when actually showering, after a few minutes use.

Thanks for your concern. Don't worry I'm not going to try anything irresponsible. Electrics frightens the willies out of me :) I will have a look but won't attempt to do anything with which I am not comfortable. Is correcting a neutral burn out (and by that I assume this means replacing...

Thanks for your concern. Don't worry I'm not going to try anything irresponsible. Electrics frightens the willies out of me :) I will have a look but won't attempt to do anything with which I am not comfortable. Is correcting a neutral burn out (and by that I assume this means replacing...

I assume CU is consumer unit? Is the shower isolator switch the switch I refer to as the one not being tripped on the CU? If not, is it the pull switch to turn on the shower in the bathroom? Not at all well up on these things??! I don't have test equipment so will need an electrician to...

Yes, it's the main RCD (RCCB) that trips and everything goes off. It says 63A 30mA 363/S030 if that helps? Hope 6mm is okay - the electrician I spoke to said it was, and his company wired the house when it was built!

I live in a 5 year old house. About a month ago, the Mira Sport 7.5kw electric shower started tripping the RCD after about 5 minutes of use. I spoke with an electrician who said that it was almost certainly the shower unit itself and that this should be replaced. i bought a new Mira Sport 9kw...

Thanks all. From the guide it must be 6mm or even 4mm, it is certainly not 10mm (overall 17mm). The installation will be carried out professionally, I just needed to know whether to go with a 10.8kw and have the additional cost of an electrician to re-wire, or just go with the cheaper...

Hi I have a 7.5kw electric shower which has decided to trip the circuit breaker each time it is used, so time for a new shower. I have my eye on a new 10.8kw monster, but have read that installation requires 10mm cable being that it is larger than the standard. My question is how do I...