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I think the only sure way is to put a high-impedance volt meter and measure the voltage across live and neutral. Don't forget that it's AC.

You could look at the bulbs in the lighting to see if the say 120v or 240v.

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โˆ™ 2015-07-15 18:34:27
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Q: How can you tell if the electric service is 120V or 240V?
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