I was in discussion with an engineer from the local DNO recently and he told me that having two houses connected to a single  phase overhead line was the same as having a looped supply and would require unlooping for EV charge point installation. Makes sense, but not something I have thought about before. I wonder how many EV charge points are connected in this way, I may have done a couple.

So the question is how do you identify a single phase supply line.

I the street we were discussing at the time, 3 phase and single phase were easy to identify because for the 3 phase it was obvious that there were multiple cores twisted together on the overhead 3 phase cables, is this always the case.. When it's not obvious how many cores are in a overhead line what other clues are there. If the feed to a pole is underground and only the link from pole to house is overhead how do you know how the pole is supplied. This is the case in my village, each pole has at least 3 or 4 houses on it, I assume this is a 3 phase supply. I hope it is because i have installed 3 charge points in the village and am aware of a few more, some poles have at least 2 EV charge points connected.

I wonder why I have never seen this addressed in BS7671 or anywhere else.