residential house,all grounding bonded and goes back to ground rod at consumer's meter on pole at entrance to house the roof is a steel frame design. should the the grounding conductor for the roof go to a separate ground rod other from that on the pole?or shuold it be routed to the meter pole ground roof is also bonded diagonally end to end with grounding cable, in case of lightning might it not be safer to have a separate ground rod?