Must admit, I was wondering if it was fitted, or had ever been fitted.Is the link between the neutral and earth terminal in the cut out still in place ?
ProbablyI think you are assuming too much competence on behalf of the meter fitter!
As I recall, when I had an isolator fitted, the guy didn't take any measurements at all - only a quick check of polarity.
TN-C-S is like that. Just two cores in which may be separate cables overhead, or concentric (buried or overhead). Inside the service head (a.k.a. main fuse unit) the earth terminal is linked to the neutral conductor. Out in the street, there will be multiple points where the neutral is earthed - hence the name "PME" (protective multiple earthing).I thought it was quite obvious that the earth was unconnected, as it isn't a main cable entering the head, just two cores, line and neutral - is it fed from overhead lines, or is there a proper intake head somewhere?
As long as the neutral conductor doesn't get broken, this does give a very good earth.