I think Harbor Freight (possibly Radio Shack if you can find one), and some other stores sell voltage sensors, these emit a beeping sound when they come close to an energized wire. I have one that I use when I need to make sure a circuit is de-energized before working on it. I also have AC voltmeters, but the sensor does not require any connections, and is easier to use.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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