Having switched the ring main circuit off at my newly pro-fitted CU, I cut through the T&E wiring on a circuit I'm working on, and the rcd tripped. Now the circuit was definitely dead (I'd touched all of the wires without killing myself!).
How can this be possible - and I assume I need to get the "expert" back in to correct this?
no prob this is normal!
when you cut the 'dead' circuit you would have only 'killed' the live conductor by switching off the MCB,
when you cut wire it connected N & E together, if any other circuit was taking power ie a light it would have given an unbalance to RCD which does its job & trips, bit of a pain but not a fault,
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