Red Seal Electrician Practice
Safety and work practicesQuestion 590 of 1506

Why is an ungrounded power system considered dangerous?

  1. The voltage between its two conductors is always doubled.
  2. It cannot supply current to any load that is connected.
  3. The conductors become hot because of the lack of a ground.
  4. Voltage to earth is unpredictable at every point.
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Correct answer: Voltage to earth is unpredictable at every point.

Two people touching different conductors, or one ground fault, can create a shock path through the earth.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 3.3: Shock Current Path

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Questions last reviewed: 18 October 2026