Earthing at the Origin

[Engineer54]

I was chatting to a DNO bloke a couple months ago. He was there to change an old head for a new one. It was a TNS. He said to me something along the lines of "you have lots of different names for things, we just call them TT or PME. This one we would call a PME"
He told me that everytime they have a fault on a cable that needs to be dug up and fixed, they PME it.

He's not correct though is he, at best that statement is very misleading. There are still thousands of network distribution cables that are still TN-S, and have had no PME/TNC-S connections made to them as yet. There are greater number of older TN-S cables that have had PME connections made to them, but are in no way close to being a true PME supply. There are more network distribution cables out there that are carrying both TN-S and TNC-S, than one or the other TN sytems.

The only distribution supplies that can be guarantee'd to be PME when converted, are overhead distribution supplies, when the DNO's ''must'' earth the neutral at every third or fouth pole on the strings...