So for the gec if I run a 2/0 from the 3" copper water pipe to the main breaker neutral bar a #6 from ground rods to the same. For the gec to the 75kva trans can I take a #4 from the same neutral bar to the 75kva trans or do I have to run the #4 back to the water pipe. I thought the taps had to be made outside the main panel.
