Refrigeration & Air Conditioning Mechanic Red Seal · Question
When interpreting a ladder diagram for a control circuit, what does a normally closed (NC) contact of a control relay (CR) typically indicate?
In a ladder diagram, a normally closed (NC) contact means that the contact allows current to flow when its associated relay coil is de-energized. When the coil
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Question: When interpreting a ladder diagram for a control circuit, what does a normally closed (NC) contact of a control relay (CR) typically indicate?
Answer options:
- The circuit is open when the relay coil is energized.
- The circuit is closed when the relay coil is energized. ✅ The circuit is closed when the relay coil is de-energized.
- The contact is always open regardless of coil status.
Correct answer: The circuit is closed when the relay coil is de-energized.
Explanation: In a ladder diagram, a normally closed (NC) contact means that the contact allows current to flow when its associated relay coil is de-energized. When the coil is energized, the contact opens, breaking the circuit.
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