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It seems odd to have a isolator next to a fuse. About 5 years ago so 2010 so a RCD would be required some where but regulations and manufacturers instructions have required RCD protection for many years.
Also of course the loop impedance is important and before swapping that would need measuring.
With TT supplies sometimes there is a 100 mA RCD on the main incomer this is not good enough for shower protection needs to be 30 mA.
Also of course the loop impedance is important and before swapping that would need measuring.
With TT supplies sometimes there is a 100 mA RCD on the main incomer this is not good enough for shower protection needs to be 30 mA.