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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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