Lockout/Tagout (LOTO) Safety Procedures for Hazardous Energy Control

Date: 2026-09-12

Duration: [DURATION] minutes

Presenter: [PRESENTER NAME]

Location: [LOCATION]

Objective

To reinforce the critical steps, responsibilities, and controls required to prevent injury or death from unexpected energization, startup, or release of hazardous energy during servicing and maintenance activities.

Introduction

Lockout/Tagout (LOTO) is one of the most important life-saving safety procedures used in maintenance, servicing, cleaning, inspection, and repair work. Hazardous energy can be electrical, mechanical, hydraulic, pneumatic, chemical, thermal, gravity-related, or stored energy such as springs, capacitors, pressurized lines, and elevated machine components. When this energy is not properly isolated, workers can suffer crushing injuries, amputations, electrocution, burns, or fatal incidents. OSHA requires employers to establish and enforce energy control procedures, train employees, and inspect those procedures regularly to ensure they remain effective. A strong LOTO program protects both the worker performing the task and everyone working nearby.

Presenter Note: Open by asking participants to name a machine or process on site that stores energy even after it is shut off. Use that example to transition into why verification and personal control are essential.

Key Points

• 1. Identify the energy sources before work begins: Before any servicing or maintenance starts, the authorized employee must identify all energy sources connected to the equipment and understand the hazards each source presents. This includes electrical power, moving mechanical parts, hydraulic pressure, pneumatic pressure, thermal energy, gravity, and any stored or residual energy. A complete energy review prevents workers from missing hidden hazards such as trapped pressure, rotating flywheels, or elevated components that can move unexpectedly. [1] [3]
  • Review the machine-specific LOTO procedure before shutdown.
  • Identify all isolation points, including valves, disconnects, breakers, and blocks.
  • Consider secondary energy sources that may not be obvious at first glance.
• 2. Notify affected workers and coordinate the shutdown: Affected employees must be informed that equipment will be shut down, locked out, and taken out of service. Clear communication prevents someone from attempting to operate the equipment, entering the work area unexpectedly, or assuming the machine is available for use. The shutdown should follow the established sequence for that specific machine so that de-energization does not create additional hazards. [1] [6]
  • Tell affected workers what equipment is being isolated and why.
  • Use the normal stopping procedure for the machine or process.
  • Do not bypass steps or improvise a shutdown sequence.
• 3. Isolate every energy source and apply personal lockout/tagout devices: After shutdown, the equipment must be completely isolated from all energy sources using the correct energy-isolating devices. Authorized employees then apply locks and tags so the equipment cannot be re-energized until the work is complete. If multiple workers are involved, each authorized employee must maintain personal control of their own lockout device or use an approved group lockout system that provides equivalent protection. [4] [14]
  • Use the correct disconnects, valves, blocks, or breakers for the equipment.
  • Apply locks in a way that holds the isolating device in the safe or off position.
  • Use tags as warning and communication devices, not as a substitute for physical isolation when lockout is possible.
• 4. Release, restrain, or control stored energy before starting work: Stored energy can remain dangerous even after the main power source is isolated. Workers must dissipate or restrain energy in capacitors, springs, elevated machine members, rotating flywheels, hydraulic systems, and pressurized air, gas, steam, or water systems. This step is essential because residual energy can move parts, eject materials, or re-energize the system unexpectedly. [1] [6]
  • Bleed down pressure where applicable.
  • Block or secure elevated parts and moving components.
  • Ground, reposition, or restrain components that could move or release energy.
• 5. Verify zero energy before touching the equipment: Verification is the final and non-negotiable safety check before maintenance begins. The authorized employee must confirm that the equipment is isolated and cannot start, move, or release energy. This may include attempting a start, using a voltage detector, checking pressure gauges, or using other appropriate test instruments. Verification tools must be properly calibrated, maintained, and used according to manufacturer instructions. [4] [9]
  • Test the equipment or circuit to confirm isolation.
  • Verify that stored energy has been removed or controlled.
  • Do not rely on tags, assumptions, or visual appearance alone.
• 6. Restore equipment safely after the work is complete: Restoration must be controlled and deliberate. Before removing LOTO devices, the work area must be inspected to ensure tools, parts, and debris have been removed and all guards or components are reinstalled. Affected employees must be informed before devices are removed and the equipment is re-energized. Only the employee who applied the lock or tag should remove it, unless the written procedure allows an exception. [1] [5] [7]
  • Inspect the work area and confirm the machine is ready for service.
  • Ensure all workers are clear before re-energizing.
  • Remove locks and tags in accordance with the written procedure and company rules.

Hazard Identification

The main hazards in LOTO work come from unexpected energization, startup, or release of stored energy. These hazards can exist even when a machine appears to be off, disconnected, or motionless.

• Unexpected startup of machinery or equipment during servicing or maintenance: Crushing injuries, amputations, entanglement, impact trauma, or death if a worker is inside the danger zone when the machine starts. [2] [10]

(Risk: High)

• Release of electrical energy from circuits, capacitors, or energized components: Electrocution, arc flash, burns, shock, fire, or secondary injuries from sudden movement or equipment failure. [3] [1]

(Risk: High)

• Stored hydraulic or pneumatic pressure remaining in lines, cylinders, or accumulators: Unexpected movement, hose whip, injection injuries, crushing, or sudden release of fluid or air pressure. [1] [6]

(Risk: High)

• Failure to isolate all energy sources or missing a secondary energy source: A worker may believe the machine is safe when a hidden source can still move parts, energize controls, or release pressure, leading to serious injury or fatality. [4] [13]

(Risk: High)

• Improper removal, bypassing, or misuse of locks and tags: Unauthorized re-energization, exposure of workers to moving parts or live energy, and loss of personal control over the hazard. [7] [15]

(Risk: High)

Presenter Note: Emphasize that many LOTO incidents happen because workers assume energy is gone after shutdown. Reinforce that stored energy and secondary sources are common failure points.

Control Measures

Use the hierarchy of controls by first eliminating exposure through shutdown and isolation, then engineering the hazard out with energy-isolating devices, then applying administrative controls such as written procedures, training, and verification, and finally using PPE as the last line of defense. LOTO is primarily an isolation and administrative control system, but it must be supported by reliable devices, clear procedures, and disciplined work practices.

• Develop and follow machine-specific written energy control procedures: Document the shutdown, isolation, lockout/tagout, stored-energy control, verification, and restoration steps for each machine or process. Make sure the procedure is available to authorized employees and reflects the actual equipment configuration. [4] [4]
• Train authorized and affected employees: Train authorized employees on energy source recognition, magnitude of energy, isolation methods, and device application/removal. Train affected employees on the purpose of LOTO and the prohibition against restarting locked-out equipment. Retrain when procedures, equipment, or job assignments change. [3] [3]
• Use durable, standardized, substantial, identifiable, and unique lockout/tagout devices: Select devices that can withstand the environment, remain legible, cannot be removed inadvertently, clearly identify the employee who applied them, and are used only for hazardous energy control. Each lock should have a unique key or equivalent unique control. [4] [4]
• Apply personal lockout control or approved group lockout procedures: Each authorized employee should maintain personal control of their own lockout device. When group lockout is used, follow the approved procedure so every worker has equivalent protection and accountability during the job and shift changes. [11] [9]
• Verify zero energy before beginning work: Use a deliberate verification step such as a test start, voltage test, pressure check, or other appropriate method to confirm the machine is isolated and de-energized. Continue monitoring if stored energy could re-accumulate during the task. [12] [9]
• Control restoration and removal of LOTO devices: Before re-energizing, inspect the work area, remove tools and parts, ensure guards are in place, confirm all workers are clear, notify affected employees, and remove devices according to the written procedure. Only the employee who applied the device should remove it unless the procedure allows otherwise. [5] [7]

Safe Work Procedures

1. Prepare for shutdown by identifying the energy type, the hazards, and the control methods before touching the equipment. [1]
2. Notify all affected workers that the equipment will be shut down and locked out for service or maintenance. [1]
3. Shut down the machine using the normal stopping procedure and follow the specific written sequence for that equipment. [6]
4. Isolate the equipment from all energy sources using the correct energy-isolating devices. [4]
5. Apply locks and tags, then dissipate or restrain stored energy before starting maintenance. [1] [1]
6. Verify isolation and zero energy using appropriate test instruments or a deliberate start attempt where permitted. [9]
7. Restore equipment only after the work area is inspected, tools are removed, workers are clear, and affected employees are informed. [5] [1]

Presenter Note: Walk the group through the sequence step by step. Ask participants where mistakes most often happen on their equipment: shutdown, isolation, stored energy release, or verification.

Personal Protective Equipment (PPE) Requirements

• Safety glasses or goggles: Wear eye protection whenever there is a possibility of fluid release, flying debris, or unexpected movement during isolation, testing, or restoration. Eye protection is especially important when bleeding hydraulic or pneumatic systems, opening panels, or verifying equipment status.
  • Use the correct lens type for the task.
  • Replace damaged or scratched eye protection immediately.
• Task-appropriate gloves: Select gloves based on the hazard present, such as cut-resistant gloves for sharp components or insulated gloves where electrical exposure is possible and the task requires them. Gloves should support the task without reducing dexterity during lock application, valve operation, or inspection.
  • Do not use damaged gloves.
  • Remove gloves when they create a snagging hazard near rotating parts unless the procedure requires them.
• Hard hat: Wear a hard hat when there is a risk of overhead hazards, falling components, or work being performed around elevated equipment or suspended loads. A hard hat helps protect against impact injuries during maintenance and restoration activities.
  • Inspect the shell and suspension before use.
  • Replace hard hats that are cracked, brittle, or damaged.
• Safety footwear: Wear safety footwear with slip-resistant soles and toe protection where required to reduce the risk of foot injuries from dropped tools, parts, or components during maintenance and reassembly.
  • Keep footwear clean and in good repair.
  • Use footwear appropriate for the floor condition and task.

PPE does not replace lockout/tagout. It is the last line of defense and must be used together with proper isolation, verification, and safe work practices.

Real-World Example or Case Study

A maintenance technician began cleaning a conveyor after shutting off the control switch but did not isolate the main disconnect or release stored energy in the system. A second worker restarted the conveyor from another control station, causing the belt to move unexpectedly and trapping the technician’s hand. The incident resulted in serious injury and a lengthy investigation. The lesson is clear: shutdown alone is not enough. The equipment must be isolated, locked, tagged, stored energy must be controlled, and zero energy must be verified before work begins. [2] [3]

Presenter Note: Use this example to reinforce that a control switch is not an energy-isolating device and that another person may still be able to start the machine if the main source is not isolated.

Group Discussion

Discuss the following questions:

1. Where on our equipment are the hidden or secondary energy sources that are easiest to miss?
2. What is our verification method for proving zero energy before maintenance starts?
3. How do we handle group lockout so every authorized employee keeps personal control of the hazard?

Presenter Note: Encourage workers to speak from experience. Ask them to identify one improvement they can make immediately on their next LOTO task.

Emergency Procedures

1. If a machine starts unexpectedly or energy is released, stop work immediately, move to a safe location, and warn nearby workers to stay clear of the hazard area. [2] [10]
2. Notify supervision and emergency response personnel at once, and do not attempt to restart, repair, or remove LOTO devices unless you are authorized and the area is safe. [7]
3. Provide first aid or emergency medical assistance as required, isolate the area, and preserve the scene for investigation after the immediate hazard is controlled. [3]

Questions and Answers

If you have questions about any step in the LOTO process, ask now. The goal is to make sure everyone understands the procedure before work begins.

• Q: Who is an authorized employee under LOTO?

A: An authorized employee is a person who locks out or tags out machines or equipment to perform servicing or maintenance. This person is trained to recognize hazardous energy sources, isolate them, and verify that the equipment is safe before work begins. [8]

• Q: Who is an affected employee?

A: An affected employee is someone who operates or uses the machine being serviced, or who works in the area where servicing or maintenance is being performed under lockout or tagout. [8]

• Q: Why is verification so important?

A: Verification confirms that the machine is truly isolated from its energy source and that stored energy has been removed or controlled. It is the final check that prevents workers from relying on assumptions or warning tags alone. [12]

• Q: How often must energy-control procedures be inspected?

A: They must be inspected at least annually, and the inspection must be certified in writing. The inspection should confirm that the procedures are adequate and that employees understand and follow their responsibilities. [5]

Summary

Recap of main points:

• Identify every energy source, including stored and residual energy, before starting maintenance. [1]
• Notify affected workers, isolate the equipment, and apply personal lockout/tagout devices correctly. [1]
• Verify zero energy with a deliberate test before beginning work. [9]
• Restore equipment only after the area is clear, tools are removed, and the proper removal procedure is followed. [5]

Action Items

Specific actions participants should take:

1. Review the written LOTO procedure for the equipment you will work on before the job starts. [4]
2. Confirm that all energy sources and stored energy points have been identified and isolated. [4]
3. Verify zero energy using the approved test method before touching the machine. [12]
4. Never remove another employee’s lock or tag unless the written procedure specifically allows it. [7]
5. Speak up immediately if you see an unsafe LOTO condition, missing device, or unexpected energy source. [3]

Remember: Lock it, tag it, test it, and verify zero energy before you touch it.

Report all hazards, near-misses, and incidents to your supervisor immediately.

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