When checking a suspected open circuit, what step should you perform before using a live test to avoid damage?

When checking a suspected open circuit, what step should you perform before using a live test to avoid damage?

• A. De-energize the circuit, isolate power sources, and verify with a continuity check before applying power
• B. Apply power and then test with a continuity meter
• C. Replace the circuit breaker
• D. Disconnect the battery and leave it unpowered

Answer: (A)

Before applying power, you must remove all energy sources from the circuit and confirm there is no residual energy. De-energize the circuit, isolate power sources, and perform a continuity check with the power off. This ensures there isn’tStored energy or an unintended path that could cause a short or arc once power returns, protecting both the equipment and you. Only after verifying the circuit is truly de-energized should you proceed with a live test. Testing with power on or using a continuity check after energizing can damage meters and components or hide hazards. Merely disconnecting the battery without verifying all other sources and the path won’t guarantee safety or accuracy.

Before applying power, you must remove all energy sources from the circuit and confirm there is no residual energy. De-energize the circuit, isolate power sources, and perform a continuity check with the power off. This ensures there isn’tStored energy or an unintended path that could cause a short or arc once power returns, protecting both the equipment and you. Only after verifying the circuit is truly de-energized should you proceed with a live test.

Testing with power on or using a continuity check after energizing can damage meters and components or hide hazards. Merely disconnecting the battery without verifying all other sources and the path won’t guarantee safety or accuracy.