I had the same problem with a kids camp I wired ten years ago. All sorts of water tests were done. It came back not to be the cause. One day at a local code class, an electrical grounding profession was there to explain grounding, I told him of the situation. He brought out his equipment and saved his findings. I went to the local power company and told them that they had a bad transformer or capacitor in the area and it was leaking back thruogh thier system. They would run a check of a one mile area from the camp. Two different crews said they couldn't find any problem. Since that time, the camp hasn't had problem since. By the way, the expert I used is retired and living in the southwest area of usa. rminnick
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