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I have recently fitted a new electric shower, rated at 10.5 kW, using 10mm2 twin and earth cable and a 45A MCB.
My consumer unit has a 100A main switch, supplying split load sections - one supplying the lights and cooker, and the other the sockets and now the shower, via a 80A RCD (30mA trip current).
I believe this set-up to be reasonable, however the RCD trips as soon as the shower is turned on. I cannot see any fault with the new shower unit, in that I have measured the resistance between live and earth when the water is flowing (with the power off, obviously!) and it is at least 500 MegOhms.
Can anyone with more experience please advise why the RCD may be tripping?
Cheers.
My consumer unit has a 100A main switch, supplying split load sections - one supplying the lights and cooker, and the other the sockets and now the shower, via a 80A RCD (30mA trip current).
I believe this set-up to be reasonable, however the RCD trips as soon as the shower is turned on. I cannot see any fault with the new shower unit, in that I have measured the resistance between live and earth when the water is flowing (with the power off, obviously!) and it is at least 500 MegOhms.
Can anyone with more experience please advise why the RCD may be tripping?
Cheers.