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See page 13 of the instructions: http://www.mirashowers.com/onlinecatalog/pdf/p3279_2a.pdf Named and shamed...

Thank you for all your replys - I will change the cable to 10mm and upgrade the mcb to 50A - hopefully this will cure the tripping. Again thank you all for your help.

Yeah - I considered that, but I telephoned the shower manufacturers and they said 6mm was fine for 10m runs and 10mm would be ok upto 20m runs. My run is less than 10m so I hoped that 8m of 6mm would be ok. Could the mcb be faulty? Could the shower be faulty?

Thanks for the reply. I did think that 45A was too small but that is the stated mcb to use acording to the shower instructions... Do you think I can use a larger rated mcb with the existing cable sizes and lengths? If so what size do you recommend?

Hello all, I have recently installed a 10.8kw shower and it worked fine for 7 days. Now the 45A mcb trips when I run it at the 'High' setting. It still works fine on 'Medium' and 'Low'. There was an existing run of 8 Meters of 6mm cable from the mcb to a 40A ceiling power switch which I...