I got an addendum question to (DonsResqcapt19). Whenever we do multi-family dwelling we are allowed to daisy-chain all the Service panel together, for example, it there are three panels all the grounding electrode conductors are tied to the neutrals and finally at the end(last panel) goes to the water pipe and ground rods. If you put a clamp-on on those conductors not the last one but the up stream panels you are drawing a significant amount of current almost half of the neutral current. To me this means that the last panels neutral will be carrying a whole lot of extra current than it was designed for.
