A key action to ensure safety during lockout/tagout is testing and verifying the circuit to ensure it is actually ______.

• A. Energized
• B. Isolated
• C. De-energized
• D. Unpowered

Answer: (C)

The key idea is to verify there is no electrical energy present in the circuit before work begins. In lockout/tagout, you test to confirm the circuit is actually de-energized, meaning all energy sources are removed and any stored energy in the circuit is discharged. This zero-energy state is what keeps you safe from shocks or unexpected re-energizing while you’re servicing equipment.

Isolation alone isn’t enough because energy can remain stored or be introduced back into the circuit after you disconnect it. Unpowered can imply no external source, but stored energy or backfeed can still pose a hazard. Energized is obviously unsafe for maintenance. By verifying de-energization with the appropriate test equipment and procedures, you ensure a true safe condition before proceeding.