- Reaction score
- 334
That was my thought. With the neutral being connected via a fly lead all of the current measured should be equal.With single/dual RCD yes, but not RCBO unless it has an up-front RCD (as sometimes done for TT systems). For RCBOs to interact in a non-obvious manner it would need to be a N-N sort of fault.
I wonder if it could be the switching effecting the electronics in the rcbo. With lighting I would expect a shared neutral and a botched cu change.