I have been "walk checking" TNC-S supplies to "stand alone" houses in the countryside in recent times. Often a house will have its own pole mounted trafo. It's all TNC-S here so I, m really curious to know what type of earth electrode the DNO is installing. As they (pole trafo, s) are all installed on private property,I have, nt been able to get up close enough yet to inspect one. The other difficulty is that even in getting up close to inspect one, you still cannot know what kind of electrode has been installed in the ground. But bearing in mind modern houses have no alternative earth paths, it would have to be a very, very significant electrode to be of any use.