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You should have about 230 volts between any pair of 3-phase service legs: L1-L2, L2-L3, L3-L1. If the voltage measured between any one pair results in low or no voltage, then you have a fuse or circuit problem.

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12y ago
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14y ago

Three phases are:

115 volts @ 0 degrees

115 volts @ 120 degrees

115 volts @ -120 degrees

Just for comparison purposes, phase to neutral voltage is:

(Phase) - (neutral voltage) = (Phase) - (0) = Phase voltage

So phase to phase voltage is:

(Phase 1) - (Phase 2) = (Phase 1) * sqrt(3) = (115) * 1.732 = 208 volts.

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Q: How does a 3-phase 115 volt power supply measure 200 volts in-between each phase?
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