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Vanman my friend
I think you must agree, that if 6A a breaker will trip with a 7A fault current(CPC-L), then it surely will trip with a *a current short circuit(L-N).
As Zs between L-E has a higher value, than Zs between L-N, only Zs for L-E is measured.
CPC wire on a 6mm T&E is 2.5mm, and N wire is 6mm.
Therefore current through the L-CPC path( 6mm+2.5mm) will be less, than the Current through L-N path(6mm+6mm).
If there is no earth continuity then its potentially fatal, but if Neutral is missing or non continuous then it no big deal, it comes apparent in the functional test.
My names not Glenn!
OK, I see where your coming from but having a good Zs does not guarantee that the L-N impedance is lower - there could be a high resistance connection somewhere on thev neutral!
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