I do not know the answer to your question other than to say that I think operating near primaries takes a lot of specialized training and specialized equipment. If a primary voltage were to hit someone, I get the impression the person would be very lucky to survive it, and if they do, they will probably be missing a large part of their body. It will burn a person from the inside out, along the entire length of the path that the electricity flows. Horrific injuries are the result. I would say, as an amateur, that such work should be left to the folks who work for the power company.