Which steps should you take to safely troubleshoot a no-power condition at a panel?

• A. Verify de-energization, lockout/tagout, test for absence of voltage with a meter, inspect main and branch breakers, check for loose connections and wiring faults; follow supervisor.
• B. Replace all breakers first, then re-energize.
• C. Use a live voltmeter to energize circuits.
• D. Call supervisor after turning off three switches.

Answer: (A)

When diagnosing a no-power condition at a panel, the priority is to work safely by ensuring the system is truly de-energized and remains that way while you inspect. Start by de-energizing the panel and applying lockout/tagout so no one can restore power while you’re working. Then verify absence of voltage with an appropriate meter before touching any conductors or components. This verification protects you from shock and arc flash and confirms you won’t be startled by a hidden source of energy.

Next, inspect the main disconnect and branch breakers for proper operation and secure connections. Look for tripped breakers, loose or damaged wiring, and signs of wear or overheating. Loose connections and faulty wiring can cause a loss of power or intermittent issues, so tightening or replacing components as needed is part of a thorough check. Always follow supervisor directions and procedures if you encounter anything unusual.

Other approaches skip essential safety steps or involve energizing circuits, which is dangerous and can create new risks.