Which of the following is the correct sequence for a Lockout/Tagout (LOTO) procedure?

• A. Notify affected workers; isolate energy sources; apply lockout devices and/or tags; verify zero energy; perform maintenance; remove tools; re-energize only after clearance.
• B. Isolate energy sources; notify affected workers; verify zero energy; apply lockout devices.
• C. Notify affected workers; isolate energy sources; apply lockout devices and/or tags; verify zero energy; perform maintenance; remove tools; re-energize only after clearance.
• D. Apply lockout devices only.

Answer: (C)

Lockout/Tagout relies on a disciplined sequence to keep workers safe by making sure hazardous energy is controlled before any maintenance or servicing begins. The process starts with informing everyone affected that a lockout is going to be applied, so they’re aware the equipment is shut down and cannot be operated unexpectedly. Next, all energy sources feeding the equipment are isolated to physically prevent energy release. After isolation, lockout devices and/or tags are applied to prevent re-energizing the equipment while work is being done. It’s essential to verify that all energy has been released and the system is at zero energy before touching the equipment, ensuring there is no residual or stored energy that could cause harm. Only then does maintenance or servicing take place. Once the work is finished, tools are removed and the system is re-energized only after clearance is obtained from the responsible person, confirming it is safe to restore operation.

This order matters because skipping any step—such as failing to notify workers, skipping verification of zero energy, or re-energizing without proper clearance—creates opportunities for unexpected energy release and serious injury. A plan that stops short at simply applying a lockout or that re-energizes without the final clearance does not adequately protect workers or ensure a safe environment.