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Will happen on TN-S also as neutral and earth connected at the star point of the transformerThe N-E 'fault' is most likely the N-E loop of a TN-C-S installation. If you're not an electrician, with TN-C-S you have a line conductor and a neutral conductor coming in to the service head. The earth is then linked to the neutral conductor. TN-C-S stands for Terra Neutral Combined Separate as in earth/neutral combined (in the cable) and then separate (at the service head).
On the consumer side, if the installation is not fully isolated you will get a continuity reading between earth and neutral which is why you should fully isolate circuits for this kind of fault finding.