I have a 4000Amp Delta/Y service with parallel 500 kcmil size wire. I have a Delta ground system ,building steel and a cold water pipe. How do I apply Artlicle 250.66. I've been told that my 250kcmil grounding electrode is too small. This Ground runs straight thru a bond bushing and passes thru a bonding lug on a ground plate, then outside to my Delta Ground. The grounding lug and Plate are bonded to building steel via a #6 CU. Separately the cold water pipe at entry is attached to the grounding plate via a #6 CU.
