Electrician Red Seal · Question
A motor starter's control circuit includes a normally closed (NC) pressure switch. If the pressure drops below the set point, what action will the pressure switch initiate in the control circuit?
A normally closed pressure switch means it is closed under normal or sufficient pressure. If the pressure drops (below the set point), the switch will open, bre
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Question: A motor starter's control circuit includes a normally closed (NC) pressure switch. If the pressure drops below the set point, what action will the pressure switch initiate in the control circuit?
Answer options:
- It will close, allowing power to flow to the starter coil. ✅ It will open, interrupting power to the starter coil.
- It will provide an alarm signal only.
- It will reverse the motor's direction.
Correct answer: It will open, interrupting power to the starter coil.
Explanation: A normally closed pressure switch means it is closed under normal or sufficient pressure. If the pressure drops (below the set point), the switch will open, breaking the control circuit and de-energizing the starter coil, thereby stopping the motor.
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