Safety and work practicesQuestion 427 of 1506

Equipment frames are bonded to the grounded system. What happens when a line conductor touches the frame?

  1. A low-resistance path forms and the breaker trips
  2. Only a small current flows and the frame stays live
  3. The neutral becomes open
  4. The system voltage doubles
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Correct answer: A low-resistance path forms and the breaker trips

The fault becomes a line-to-neutral short circuit that clears the supply.

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