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This is a middle school science level question. No offense, but if you don't know how to do this you should not be doing any electrical work, let alone commercial/industrial. If you are a homeowner, please buy a book. If you are a professional, please take a class and get licenced. Get a voltmeter. Set it on AC volts. Use the two leads to measure the voltage across the two points you are interested in.

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โˆ™ 2007-06-12 20:23:25
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Q: In commercial or industrial electrical work how would you take a voltage reading?
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