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 - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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