from a engineering standpoint: The flat area on the terminal end needs to have enough surface area to equal the diameter of the cable. There are differences I suppose if it is copper or aluminum cable but you get the idea here in that that flat surface also has to conduct the same amperage as the cable itself. so, I think the view here is the surface area in contact with the voltage supply and cable dia.//material … I should think the diameter of the hole is subserviant to this?
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