THE NEC 1999 HAS AN EQUIPMENT GROUNDING SELECTION TABLE BASES THE GROUND WIRE ON THE TRIP OR FUSE RATING OF THE QVERCURRENT DEVICE. WHEN YOU GET TO THE 4000 AMP RANGE IT CALLS FOR A VERY LARGE GROUND WIRE AND EACH OF THESE SIZES HAS TO BE RUN IN EACH PARALLEL RUN OF CONDUIT. OVER THE YEARS I...