Red Seal Electrician Practice
Power factor and three-phaseQuestion 1409 of 1506

A balanced wye-connected source has a phase voltage of 277 V. What is the line voltage?

  1. 554 V
  2. 160 V
  3. 480 V
  4. 277 V
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Correct answer: 480 V

In a balanced wye, line voltage = phase voltage × √3 = 277 × 1.732 = 480 V.

Source: Computed, 7.5: Three-phase Y and Delta Configurations

Practice power factor and three-phase

Questions last reviewed: 18 October 2026