Chris Pearson:
From the sound of it, all of the final circuits are SP.
Reverse the polarity of a circuit on L3. Connect what looks like N to E. That goes back to the N-E link so you now have N at L3 potential. The devices on the other circuits now have phase to phase (L1-L3, L2-L3) for those few milliseconds before the RCD trips.
Chris Pearson:
From the sound of it, all of the final circuits are SP.
Reverse the polarity of a circuit on L3. Connect what looks like N to E. That goes back to the N-E link so you now have N at L3 potential. The devices on the other circuits now have phase to phase (L1-L3, L2-L3) for those few milliseconds before the RCD trips.
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