Testing and verification of de-energization is performed to ensure there is no dangerous energy remaining before beginning work.

• A. To ensure energy is restored
• B. To calibrate tools
• C. To reset the system
• D. To confirm no dangerous energy remains

Answer: (D)

The main idea here is actively confirming that all energy sources are isolated and no dangerous energy is left in the equipment before any work starts. After you lock out or tag out the energy source, you don’t just assume it’s safe—you test to verify zero energy. This means checking for live electrical energy, as well as any stored or residual energy in components like capacitors, springs, pressure lines, or other energy-storing parts. Using the appropriate testing instruments and methods, you verify that the equipment cannot move, power up, or release energy unexpectedly. Only after this verification step is complete do you proceed with maintenance, keeping you protected from shock, burns, or unexpected releases. The other options don’t serve this safety purpose: restoring energy would create danger, calibrating tools isn’t about safety verification, and resetting the system isn’t about ensuring a safe, de-energized state.