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Neutral to earth low resistance will cause imbalance and trip RCD because the neutrals and CPCs are common to all your circuits presumably.
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Having 7 socket circuits to a single RCD isn’t a great set up to start with
Extreme Earth leakage from “other” circuits can trip RCDs...
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What are your earthing arrangements ? The outside light fault, which is presumably to ground, is apparently (somehow), sending a...
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Are you sure the light isn't tagged from the power circuit?
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why put dual rcd board on a rewire
where is spd mcb
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