What steps should be followed to verify that a circuit is de-energized before starting work?

• A. Apply lockout/tagout; test absence of voltage with a properly rated meter; verify test with a second method or tester; confirm with a second qualified person; re-test after any changes.
• B. Rely on visual inspection and assume power is off.
• C. Only test once with any meter; no cross-check.
• D. Ask a supervisor for permission and proceed.

Answer: (A)

The main idea is to both isolate the energy sources and verify they’re truly de-energized before doing any work. Start with lockout/tagout to physically prevent the equipment from being energized. This creates a safeguarded state where the energy sources are blocked from re-energizing the circuit while you work.

Then verify there’s no voltage present at the work points using a properly rated meter suitable for the circuit’s voltage and category. But don’t stop there—confirm the test with a second method or tester. This cross-check helps catch a false reading caused by a faulty meter, ghost voltage, or hidden energy storage.

Involve a second qualified person to confirm the verification. A second set of eyes adds independent validation and reduces the chance of missing a source of energy.

Finally, re-test after any changes. If the system is re-energized, or if switches are moved, tools are removed, or parts are altered, you must re-verify that the circuit remains de-energized.

This approach minimizes the risk of electric shock or arc flash and aligns with best safety practices. Relying on visual inspection, a single test, or simply asking for permission does not provide the necessary assurance that all energy sources are truly isolated and dead.