Gravel in Switchyards - CR4 Discussion Thread
Oct 30, 2008· Crushed rock when wet has an approximate resistance of 3000 ohms/m. Asphalt when wet has a higher resisitiviey, approximately 9000 ohms/m. In either case their purpose is the same, to act as an insulator between people and the buried ground grid. For purposes of simulation I would use the worst case, crushed rock in this case.