Gas Heat ESCO Practice Exam

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A GFCI circuit breaker detects:

  1. current leaks to neutral

  2. voltage spikes

  3. current surges

  4. current leaks to ground

The correct answer is: current leaks to ground

A GFCI circuit breaker, or a ground fault circuit interrupter, detects when current leaks to ground, which can be potentially dangerous. Current leaks to neutral may indicate a neutral-to-ground short circuit, which a GFCI circuit breaker is not meant to detect. Voltage spikes and current surges may be detected by other types of circuit breakers, but they are not the primary function of a GFCI circuit breaker.

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