Question: If I have a grounding bus in the service entrance room, say room # 1 located on the first floor, that is connected to a water main, structural steel, and ground rods and I connected all the transformer neutrals in this room and the adjacant room to it. Then I routed a 3/0 ground wire to a ground bus located on the third floor in room # 2 and connected all transformers neutrals to that bus bar, do I have still need to connect the bus bar in room # 2 to water pipe?