Power factor and three-phaseQuestion 385 of 1506

Which supply is typically used for large motors and heavy loads in commercial and industrial buildings?

  1. Single-phase two-wire
  2. DC only
  3. Three-phase
  4. Low-voltage battery
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Correct answer: Three-phase

Three-phase carries three independent voltages on three conductors.

Source: Electrical Fundamentals Competency (Industry Training Authority of BC), 3.2: Electricity and Magnetism

Practice power factor and three-phase

Questions last reviewed: 18 October 2026