Electrician Red Seal · Question
What is the purpose of an interlock in a reversing motor starter circuit?
An interlock (mechanical or electrical) in a reversing starter prevents the forward and reverse contactors from engaging simultaneously, which would cause a sho
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Question: What is the purpose of an interlock in a reversing motor starter circuit?
Answer options:
- To ensure both forward and reverse contactors can be energized simultaneously for faster reversal. ✅ To prevent both the forward and reverse contactors from being energized at the same time.
- To automatically switch the motor between forward and reverse rotation based on a timer.
- To bypass the overload protection during motor reversal.
Correct answer: To prevent both the forward and reverse contactors from being energized at the same time.
Explanation: An interlock (mechanical or electrical) in a reversing starter prevents the forward and reverse contactors from engaging simultaneously, which would cause a short circuit across the supply phases (phase-to-phase fault).
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- A residential garage is to be wired with a 15 A, 120 V duplex receptacle. According to the Canadian Electrical
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