Greg- Now that I've baited you, let's take it a step further. There are no metallic paths between the detached garage and the other building. the other building is the house. The 3 wire supply from my SDS are two phase conductors and a common conductor. this 3 wire supply is feeding one side of a DPDT center off switch and the other side of the switch is the utility supply. The load for this switch is an emergency panel. Are you still okay with this hook up? The SDS, by the way has it's own grounding electrode (two rods) and GEC at the detached garage.
