Electrician Red Seal · Question
While replacing a faulty limit switch on a conveyor system, an electrician notices that the original switch had three terminals labelled 'NO', 'NC', and 'COM'. The new switch also has these terminals. If the control logic requires the conveyor to stop when the limit switch is pressed, which terminal pair should be used?
When the limit switch is pressed (actuated), the conveyor should stop. This implies the circuit must open to stop the conveyor. By using the Normally Closed (NC
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Question: While replacing a faulty limit switch on a conveyor system, an electrician notices that the original switch had three terminals labelled 'NO', 'NC', and 'COM'. The new switch also has these terminals. If the control logic requires the conveyor to stop when the limit switch is pressed, which terminal pair should be used?
Answer options:
- NO and COM ✅ NC and COM
- NO and NC
- COM and ground
Correct answer: NC and COM
Explanation: When the limit switch is pressed (actuated), the conveyor should stop. This implies the circuit must open to stop the conveyor. By using the Normally Closed (NC) and Common (COM) terminals, the circuit remains closed when the switch is unpressed and opens when the switch is pressed, thus stopping the conveyor.
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