Getting Down to Earth 49Rloop = 10 W + 2 W = 12 WFor sixty similar electrodes with a resistance of 10 W, the loop resistance measured when testing each electrode would be:Rloop = 10 W + 0.17 W = 10.17 WIf one of six electrodes has a resistance of 100W, and the rest have a resistance of 10 W, the loop resistance measured when testing the high resistance electrode would be:Rloop = 100 W + 2 W = 102 WThe loop resistance measured when testing each of the five other electrodes would be:Rloop = 10 W + 2.4 W = 12.4 WThe more parallel returns the lower the return loop resistance and therefore the closer the result to a fall-of-potential test. A high resistance ground among many low resistance returns will show up as a high resistance.Fig 23: Pole ground application
