What is the typical sequence for performing a Lockout/Tagout procedure?

• A. Identify energy sources, isolate the equipment.
• B. Apply lockout/tagout devices, verify zero energy.
• C. Verify zero energy.
• D. Identify energy sources, isolate the equipment, apply lockout/tagout devices, verify zero energy, and release only after maintenance is complete.

Answer: (D)

Lockout/Tagout work rests on controlling any energy that could re-energize a machine while it’s being serviced. The sequence starts with identifying all energy sources that could power the equipment—electrical, mechanical, hydraulic, pneumatic, chemical, thermal, and stored energy—so nothing is missed.

Next, isolate the equipment from its energy sources so it cannot be energized during maintenance. Then apply lockout and/or tagout devices at the energy-isolation points to provide a visible, active control that prevents re-energizing.

After the devices are in place, verify zero energy by testing and confirming there is no residual or stored energy and that the equipment remains de-energized. Only after maintenance is complete and the area is clear should the lockout/tagout devices be removed and the system re-energized, with all safety checks completed.

This orderly flow protects workers and ensures a compliant, verifiable shutdown. Missing any step or reversing the order—such as skipping identification, skipping verification, or releasing energy before work is finished—creates a serious safety risk.