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The simplest answer is that the electric utility uses a transformer across 2 of the 3 hot leads to develop a single hot lead with an earth reference. What follows below is frequently edited by both amateurs and professionals, with mixed results. Wikipedia is a better source of more detailed information on this subject, in part because the article on three phase power has pictures.

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โˆ™ 2015-08-20 13:47:36
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Q: How does 3-phase electricity from power companies get turned into single-phase for home use?
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