The fourth conductor was so the neutral and ground bars could remain isolated from each other in the sub-panel. And a ground rod could be used without neutral current being carried back though earth and the grounding conductors.
The overhead three wire triplex service supplies cause some real problems. With elevated grounding system potential when livestock are involved. If no livestock or swimming pools etc are involved. Then nobody notices ground system being hot with 1 to 10 volts.
Not so long ago we had a municipal public pool shutdown because the swimmers were getting shocks. Neutral current returning through the earth. The faults were out on the street on opposite sides of the pool. Had to call in consultants as even the PUC staff couldn't tell the difference between neutral and grounding systems. There used to be a metal property line fence around the same recreational facility. People were getting shocks off the fence. So rather than figure out the problem. The municipality replaced the metal fence with a wooden fence.
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Today's Featured Article - Grain Threshing in the Early 40's - by Pat Browning. The setting is rural Wisconsin, halfway between East Troy and Elkhorn, on Hodunk Road, our nation was at war, and I was 6, 7 and 8 years old. George was our "threshing neighbor." He was the one with the threshing machine, a JI Case on steel wheels, and he pulled it to our farm with a JI Case standard tractor also on steel. In those days, steel wheeled implements were common. The roads were general gravel, so the lugs cutting into them wasn't a problem. George would set up the thresher, s
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