Back in the 60's I lived in a trailer while in college. It had a steel water line, a copper water line to trailer, 4 wire service. One day while disconnecting copper water line, I noticed a spark. So. I pulled the electric disconnect. Still had a spark. I measured 1 vac between trailer ground, which was grounded at the electric meter 20 ft away and the steel water line, which was over 100 ft long running to the road where it connected to the water main. After I reconnected water line ammprobe measured 1 amp in the copper water line. The owner of the trailer park, also a Rose Hulman EE grad, scratched his head and had no answer.
So, I've seen what you are talking about first hand.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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