The assumption is the whole system will be tied to a common neutral conductor on the pole and no current will flow to earth but when I surveyed the 10 transformers on my street I found from a tenth of an amp or so to almost 3 measuring that solid wire coming down each pole. (all on the same MV phase)
I had close to 3 on my service neutral with the main breaker off and a similar amount on the GEC.
