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Thanks for all your help. I have decided to get an electrician in to change the 6mm for 10mm. Also, i have since found out that the CU had been moved by the previous owners and all the cables have joins in them somewhere (white sheath on cables leaving CU and grey sheath when they re-appear...

How about if we exchange the shower for an 8.5kw one? Would that be ok on 6mm cable? I also overestimated the length of the cable from the CU to the shower. It's approx. 6m in total to the isolator switch. The cable from the CU runs up a concealed channel with other cables up to the...

I was hoping you wouldnt say that... The cable from the CU disappears in to the wall and then appears in the loft so might be a bit tricky to replace. Would it be safe to disconnect the 6mm at the CU and attach it to some new 10mm and then pull it through?? I'm a bit concerned as there are a...

Hi, It's a 9.5kw shower. The twin and earth is 6mm which the manual for the shower says is adequate. The length of the cable is about 15 metres. The isolator switch is a 50amps. Will this be ok?

Thanks to you both! It's a good job I asked on here first. It all makes perfect sense now.

Hi, I currently have a Hager CU with just a MCB for our shower circuit. I need to replace the MCB with a RCBO (Hager ADN140) as I am installing a new shower and I have no RCD on the shower circuit at all. This is a photo of our CU as it stands now: This is how I imagine the RCBO...