Tom Bishop, P.E.
EASA Technical Support Specialist

Unbalanced voltages are unequal line-to-line voltage values on 3-phase circuits that can exist anywhere in a power distribution system. Unbalanced voltages can cause serious problems, particularly for motors and other inductive devices. Perfectly voltage-balanced circuits are not possible in the real world. Typically, the circuit line-to-line voltages may differ by a few volts or more. It’s when voltages differ by more than 1% that problems tend to occur.

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