A dedicated circuit feeds a light in a dwelling. The light never works. What could be a possible reason for this fault?

A dedicated circuit feeds a light in a dwelling. The light never works. What could be a possible reason for this fault?

• A. Neutral connection came apart
• B. Defective switch
• C. Bad lamp
• D. All of the above

Answer: (D)

When a light on a dedicated circuit won’t illuminate, any break or fault in the path to the lamp can cause that symptom. If the neutral connection has come apart, the return path is open and the lamp won’t complete the circuit. If the switch is defective, it may not close the circuit at all, so current never reaches the lamp. If the lamp itself is bad, there’s no light even though power and the switch are working. Any one of these faults can produce a no-light condition, so the most complete answer is that all of the above could be the cause. To diagnose, check for proper voltage at the fixture, test the switch for continuity with power off, and inspect the lamp and neutral connections.

When a light on a dedicated circuit won’t illuminate, any break or fault in the path to the lamp can cause that symptom. If the neutral connection has come apart, the return path is open and the lamp won’t complete the circuit. If the switch is defective, it may not close the circuit at all, so current never reaches the lamp. If the lamp itself is bad, there’s no light even though power and the switch are working. Any one of these faults can produce a no-light condition, so the most complete answer is that all of the above could be the cause. To diagnose, check for proper voltage at the fixture, test the switch for continuity with power off, and inspect the lamp and neutral connections.