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 Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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