How do you verify that a de-energized condition exists before starting work on FC gear?

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Before starting any work, you must confirm there is no energy present by verifying a true de-energized condition. This means using a properly rated test instrument to check for zero energy at the work point and across all potential energy sources in the circuit. Two or more independent checks are important because energy can hide in stored forms (like capacitors or inductive elements) or come from different sources, and readings can be misleading if you rely on a single test. After isolating the system, keep the lockout in place to prevent accidental re-energization while you work. This combination—verified by a suitable tester and multiple checks, with the lockout still applied—provides a reliable safeguard against unexpected energization. Simply assuming it’s off, relying on someone else’s belief, or briefly energizing to test the readout can reintroduce risk and is not acceptable.