Safety and work practicesQuestion 1009 of 1506

Why is the neutral wire connected to earth ground at the supply?

  1. It keeps hot-to-earth voltage as low as possible
  2. It raises the voltage that is supplied to the loads
  3. It stops the neutral wire from carrying any current
  4. It turns the system into a three-phase system
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Correct answer: It keeps hot-to-earth voltage as low as possible

A grounded neutral fixes the potential of the system relative to earth.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 7.1: Single-Phase Power Systems

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Questions last reviewed: 18 October 2026