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I write wrong, we have galvanized steel strip all the way to the transformer, so that is excelent grounding

case 2 in this link, https://electronics.stackexchange.c...ring-fault?noredirect=1#comment2028722_763901

@Averagesupernova They claim in case 2, rcd will not trip.

in comments members transistor and andy aka write rcd will not trip, because there is no current leak to the earth... I dont understand...

To me,it is crystally clear that will trip, but members with highest reputation scores at stack exchange, tell that RCD will not trip...

Yes. If there is a difference in the two circuit currents that pass through the RCD, then it will trip.

@Averagesupernova @Baluncore rcd will trip,for case 2 as well?

1) If I take hot and neutral wire from 230V AC socket and connect to external RCD that has one wire parallel to it, and connect to 2kW...

Why is 150V on ungrouding(flaoting) system? Doesnt have to be zero volts?

Yes low resistance of earth is important but in pratice, when hot wire touch metal case, 99% of current return via neutral as it...

In my country(EU), we have TN-C-S and TN-S system, every house must have earthing with minimum 15m long galvanized steel strip buried...

The point was that this sort of thing happens "in the wild". The real world example I gave did not have the conduit or switch box...

What is good primary protection and good construction?

Of course it wasnt self revealed, because it didnt have RCD, if it had it will trip. For this case earth is not needed to RCD trip.

@Averagesupernova Do you agree with his example why we need earth? I don't, because if his case has RCD, it will trip...