I bought a voltage detector at Harbor Freight for about five bucks. Amazon etc sells many similar devices for similar low prices. They look like a pencil, a fat fat pencil. Very simple to use, might be useful for your situation, maybe someone can comment. Kind of neat: hold it near a wire and it magically detects electricity (or not.) Dunno if professional electric people would recommend it, but I think it's handy. Easier than a volt ohm meter.
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