Electrician Red Seal · Question
A large industrial facility is experiencing intermittent tripping of circuit breakers for motor loads. Upon investigation, an electrician discovers several unbonded metallic conduits running parallel to electrical circuits for extended distances. What potential problem could these unbonded conduits cause?
Unbonded metallic conduits can become unintended return paths for ground fault currents or induce currents, especially when running parallel to conductors. This
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Question: A large industrial facility is experiencing intermittent tripping of circuit breakers for motor loads. Upon investigation, an electrician discovers several unbonded metallic conduits running parallel to electrical circuits for extended distances. What potential problem could these unbonded conduits cause?
Answer options:
- Reduced voltage drop in the associated circuits. ✅ Creation of unwanted ground loops and circulating currents.
- Improved power factor for the motor loads.
- Increased insulation resistance of the conductors.
Correct answer: Creation of unwanted ground loops and circulating currents.
Explanation: Unbonded metallic conduits can become unintended return paths for ground fault currents or induce currents, especially when running parallel to conductors. This can lead to circulating currents (ground loops), electromagnetic interference, and can create touch voltages, potentially causing nuisance tripping of sensitive ground fault protection.
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