Wiring and componentsQuestion 428 of 1506

What is the usual insulation colour of the neutral conductor in a three-wire system?

  1. Black
  2. White
  3. Red
  4. Green
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Correct answer: White

The text states the neutral always has white insulation.

Source: Electrical Fundamentals Competency (Industry Training Authority of BC), 7.4: Three-wire Power Supply System

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Questions last reviewed: 18 October 2026