In the lockout-tagout process, which step is performed last?

• A. Undo
• B. Identify energy source
• C. Notify people
• D. Shut down equipment

Answer: (A)

Lockout-tagout is about safely isolating energy so a machine can be serviced without it accidentally starting. Once the energy is isolated and the worker has completed the maintenance, the final action is to undo the lockout or tagout — remove the locks/tags and re-energize the equipment. Before restarting, you verify the area is clear, all tools are removed, and affected workers are informed. That re-energizes the system and returns it to normal operation, which is why this step is performed last. The earlier steps—identifying energy sources, shutting down the equipment, and notifying others—happen before work begins, so they aren’t the last action.