Many years ago, I worked at an engineering university that did its annual Spring Musical at a local supper club. Powering the lighting system required a temporary tie-in to the kitchen power. The electrician opened up the big panel at the service entrance, and clearly there were three hot lines, a neutral, and a protective grounding terminal. Just to be sure, he measured the voltage between one of the hot lines and the neutral, and found it was 120 volts, so everything was as it should be. ...

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