N
Nigel
It’s funny but I was talking to the guys from the DNO on a new build site a few weeks ago, all new supply’s to the homes are tncs.
I asked how far apart do you apply the earth electrodes for the pme connection, he said there’s a rod at the transformer end and a rod at the end of the cable , that’s it.
Now one guy was connecting up the street lighting and one guy applying a joint for 2 supplies to some properties but both said the same thing.
This is my point. We cannot know what is going on on the DNO side so it is irrelevant to the design process. All we need is the earthing arrangment supplied to us and BS7671 guides us from there.