In a ladder diagram for a motor control circuit, what does a normally open (NO) contact symbol (two parallel lines) typically represent when associated with a safety limit switch?

Question: In a ladder diagram for a motor control circuit, what does a normally open (NO) contact symbol (two parallel lines) typically represent when associated with a safety limit switch?

Answer options:

• The limit switch is closed when the controlled device is in its normal position. ✅ The limit switch allows current to flow when actuated.
• The limit switch breaks the circuit when actuated.
• The limit switch requires external power to operate.

Correct answer: The limit switch allows current to flow when actuated.

Explanation: A normally open (NO) contact is open in its de-energized or 'normal' state and closes to allow current flow when actuated. Therefore, an NO limit switch allows current to flow when its actuator is pressed or otherwise engaged. If it was used for safety and wired to directly interrupt current, this would be an NC (normally closed) contact, which would open when actuated.