What supply type is this?

[JohnW2]

Only with a huge earthing conductor on TNC-S but then it's not much.

Hmmm - that would presumably require that the earthing conductor had greater CSA than the N tails - and, unless that earthing conductor and tails were ridiculously long, I doubt that the difference would even be measurable!

No I haven't but that's how it's worded.

Fair enough - but I don't really believe that PEFC is ever going to be measurably higher than PSCC, particularly in domestic installations!

Did I read recently where it could be or am I thinking of something else?

I don't know - did you?

Kind Regards, John

 

[studentspark]

I was interested in how you could identify a TNCS - TNS via the loop method.

I was just curious, but when ever I take the two loop measurements the difference is often minimal, and can change by a minimal amount if you test again.

I guess the reading for the TNCS should be the same where as the tns might be slightly different.

But back to my original point that the difference is so slight, I would not conclude that it was one or the other from that test.

I am thinking the only sure way to identify is a visual check

 

[EFLImpudence]

TNC should be almost the same.
The only difference being the length of the earthing conductor csa difference.
And PME label.

TNS will usually be a bit different.