Lockout/Tagout Best Practices for Manufacturing Facilities

Manufacturing equipment can appear completely shut down and still contain enough stored energy to seriously injure or kill a worker.

Electrical circuits may remain energized. Hydraulic accumulators can retain pressure. Pneumatic systems may contain compressed air. Elevated machine components can move under gravity. Springs, flywheels, capacitors, heated materials, and process fluids can also release energy unexpectedly during maintenance or servicing.

That is why simply pressing a stop button or shutting down a machine is not enough.

An effective lockout/tagout program establishes a repeatable process for identifying every hazardous energy source, isolating it, controlling stored energy, applying personal locks or tags, verifying that isolation is effective, and maintaining that protection until servicing is complete.

For manufacturers, consistent energy control protects employees while also helping reduce unplanned downtime, equipment damage, regulatory exposure, and maintenance errors.

What Is Lockout/Tagout?

Lockout/tagout, commonly called LOTO, is a hazardous-energy control process used during servicing and maintenance of machines and equipment.

OSHA’s general industry standard, 29 CFR 1910.147, applies when unexpected energization, startup, or release of stored energy could injure employees.

Lockout Physically Restrains the Energy-Isolating Device

A lockout device holds an energy-isolating device in a safe or off position.

Examples may include locks applied to disconnect switches, circuit breakers, valves, or other devices that physically prevent energy from reaching the machine.

The lock provides physical restraint rather than simply communicating that the equipment should remain off.

Tags Provide Warning Information

A tagout device provides a prominent warning that the equipment must not be operated.

OSHA emphasizes that tags are warning devices and do not provide the same physical restraint as locks. Where equipment is capable of being locked out, lockout generally must be used unless the employer can demonstrate that a tagout system provides full employee protection.

Manufacturing facilities should therefore avoid treating a tag as interchangeable with a personal lock.

Start With an Energy-Control Assessment

Before writing procedures, the facility needs to understand where hazardous energy exists.

This should be performed systematically across equipment and processes rather than relying only on old manuals or generic machine lists.

Arbill’s guide on what an EHS assessment is explains how structured workplace evaluations can identify gaps between written programs and actual operating conditions.

Identify Every Energy Source

Manufacturing machinery often combines several types of energy.

Electrical power may run motors and controls while hydraulics move cylinders, compressed air actuates clamps, and gravity acts on elevated tooling.

Common hazardous-energy sources include electrical, hydraulic, pneumatic, mechanical, thermal, chemical, and gravitational energy.

The assessment should also consider stored energy after the primary supply has been disconnected.

Look Beyond the Main Disconnect

One machine may have several isolation points.

A production cell may share compressed air, electrical feeds, hydraulic systems, conveyor controls, robotic equipment, and auxiliary systems.

The main machine disconnect may isolate only part of the hazard.

Maintenance personnel should understand where energy enters the system and how connected equipment can affect the task.

Involve the Employees Who Work on the Equipment

Operators understand how equipment behaves during production.

Maintenance technicians often know about modifications, bypasses, secondary power sources, added utilities, or unusual shutdown behavior that drawings may not show.

Including frontline personnel can reveal hazards that would otherwise be missed.

Develop Clear Equipment-Specific Procedures

OSHA requires employers to develop, document, and use energy-control procedures except in certain limited situations specified by the standard.

At minimum, the procedure must explain its intended use and provide specific steps for shutdown, isolation, blocking, securing, placement and removal of devices, and verification of energy control.

Make Procedures Easy to Follow in the Field

A procedure should be usable by a maintenance technician standing in front of the machine.

It should clearly identify the machine or equipment, energy sources, isolation locations, stored-energy controls, verification methods, and restoration steps.

Photographs or diagrams can be especially useful on complex production equipment.

Avoid vague instructions such as “lock out all energy.”

Workers need to know exactly which disconnect, valve, breaker, block, or other isolating device applies.

Keep the Sequence Logical

The normal sequence should follow the actual flow of work.

The authorized employee first prepares for shutdown and understands the type and magnitude of energy involved. Affected employees are then notified, the machine is shut down, energy-isolating devices are operated, locks or tags are applied, stored energy is controlled, and isolation is verified before servicing begins.

Consistent sequencing helps reduce missed steps.

Do Not Confuse Control Buttons With Energy Isolation

A machine’s stop button, touchscreen, selector switch, or emergency-stop control may shut down motion without isolating hazardous energy.

OSHA distinguishes control-circuit devices from energy-isolating devices.

A machine can appear stopped while power remains available to motors, actuators, or control systems.

LOTO procedures should identify the actual isolation devices needed to physically prevent hazardous energy transmission.

Control Stored Energy

Disconnecting the main power supply may not establish a safe condition.

Stored energy must also be relieved, restrained, disconnected, blocked, or otherwise rendered safe.

Hydraulic and Pneumatic Pressure

Pressure can remain trapped in cylinders, accumulators, hoses, or lines after valves are closed.

Procedures may need to include bleeding, venting, blocking, or other methods to prevent unexpected movement.

Gravity and Mechanical Energy

Raised machine components can fall even when electrical power is disconnected.

Blocks, pins, restraints, or other mechanical means may be necessary before employees enter the danger area.

Springs, flywheels, counterweights, or rotating components may also retain energy.

Electrical Storage

Capacitors and other components can retain electrical energy after disconnection.

The procedure should account for required discharge or verification before employees make contact.

Stored-energy controls should be machine-specific rather than assumed.

Verify Zero Energy Before Work Starts

One of the most important LOTO practices is verification.

The fact that locks have been applied does not prove that isolation is effective.

OSHA requires procedures to contain specific requirements for testing or otherwise determining the effectiveness of lockout, tagout, and other energy-control measures.

Attempt a Normal Start Where Appropriate

After isolation, authorized employees may attempt to operate normal controls to confirm that the machine will not start.

Controls should then be returned to the neutral or off position.

Test Electrical Energy Appropriately

Qualified employees may need suitable test instruments to confirm that electrical energy has been isolated.

The verification method must reflect the equipment and hazard rather than relying only on the position of a disconnect handle.

Confirm Pressure Has Dissipated

Pressure gauges, venting procedures, or other methods may be necessary for pneumatic and hydraulic systems.

Verification should answer a straightforward question:

Can hazardous energy still reach the worker?

Servicing should not begin until the answer is reliably no.

Train Authorized Employees Thoroughly

OSHA distinguishes between authorized, affected, and other employees because each group interacts with LOTO differently.

Authorized Employees Need Detailed Training

An authorized employee is a person who locks out or tags out machines or equipment to perform servicing or maintenance.

OSHA requires authorized employees to understand applicable hazardous-energy sources, the type and magnitude of energy available, and the methods necessary for energy isolation and control.

Training should go beyond classroom definitions.

Employees should practice identifying isolation points, controlling stored energy, applying devices, and verifying safe conditions on the actual equipment they service.

Arbill’s manufacturing-focused guidance in OSHA Stand-Down 2026: What Employers in Manufacturing Need to Know reinforces the importance of translating safety requirements into practical frontline execution.

Affected Employees Need Different Training

Affected employees normally operate or use equipment that may be locked out or work in areas where servicing occurs.

They need to understand the purpose and use of the energy-control procedure.

Most importantly, they must understand that locked or tagged equipment must not be restarted, bypassed, or disturbed.

Other Employees Need Awareness

Employees whose work may place them in an area where LOTO is used must also understand the procedure and the prohibition against restarting or reenergizing locked-out equipment.

Do Not Rely on Annual Refresher Training Alone

Manufacturers sometimes schedule one annual LOTO class and assume that satisfies all ongoing training obligations.

OSHA’s requirements are more specific.

Retraining is required when an employee’s job assignment changes, when machines, equipment, or processes introduce a new hazard, or when the energy-control procedure changes.

Retraining is also required whenever an annual inspection or other information reveals deviations or inadequacies in an employee’s knowledge or use of the procedure.

Facilities may still choose to provide periodic refresher training as a best practice, especially when employees perform LOTO infrequently, but it should not replace the specific retraining triggers required by OSHA.

Conduct Periodic Inspections at Least Annually

Every energy-control program needs field verification.

OSHA requires a periodic inspection of the energy-control procedure at least annually.

The inspection must be conducted by an authorized employee other than the employee or employees using the procedure being inspected.

Inspect the Procedure in Use

The inspection is not simply a paperwork review.

OSHA interpretation explains that the process should include observation or demonstration of the procedure while authorized employees perform servicing or maintenance.

This allows the inspector to see whether employees follow the written procedure and whether the procedure still reflects the machine.

Correct Deficiencies

The purpose of the inspection is to identify and correct deviations or inadequacies.

A failed step should therefore trigger corrective action, procedure revision, retraining, or another appropriate response.

Certify the Inspection

OSHA requires employers to certify that periodic inspections were performed.

The certification must identify the machine or equipment, the inspection date, the employees included, and the person who performed the inspection.

Keep Procedures Current After Machine Changes

Manufacturing equipment rarely remains exactly as installed.

Controls may be upgraded. Robots may be added. Conveyors may be integrated. Pneumatic circuits may be modified. New electrical feeds may be installed.

A procedure written before those changes may no longer isolate every hazardous energy source.

LOTO review should therefore be integrated into management-of-change activities.

When equipment changes affect hazardous energy, update the procedure and retrain employees before the revised system is serviced.

Use Personal Locks Consistently

Personal control is a fundamental LOTO principle.

The individual exposed to hazardous energy should maintain control of their personal lock or tag during the period of exposure.

Locks should be standardized within the facility and identifiable as energy-control devices.

They should be durable, substantial enough to prevent accidental removal, and used only for energy control as required by OSHA.

Employees should never casually share keys or remove another worker’s device.

Establish Strong Group Lockout Procedures

Complex manufacturing maintenance often involves several employees, departments, or contractors working on the same equipment.

OSHA allows group lockout/tagout, but the procedure must provide protection equivalent to individual lockout or tagout.

Each authorized employee must apply a personal lock or tag to the group lockout device, lockbox, or comparable mechanism when beginning work and remove it when their work is complete.

Establish Clear Responsibility

An authorized employee should have primary responsibility for the group.

When multiple crews or departments are involved, one authorized employee must coordinate overall LOTO responsibility so that protection remains continuous.

Know Who Is Still Exposed

The system must make it possible to determine which workers remain protected by the group lockout.

A group lockbox can simplify control of multiple equipment-isolation keys while allowing each employee to maintain personal protection.

Manage Shift Changes Carefully

Maintenance activities may continue across multiple shifts.

OSHA requires specific procedures during shift or personnel changes to maintain uninterrupted LOTO protection.

The transfer should ensure that incoming employees establish control before outgoing employees remove their devices.

A poorly managed handoff can create a brief but dangerous period in which nobody has effective personal control.

Shift-change procedures should be written into the energy-control program and practiced before a major outage or extended shutdown.

Establish a Procedure for Removing an Absent Employee’s Lock

The normal rule is simple: the employee who applied a lock or tag removes it.

OSHA permits employer-directed removal when that authorized employee is unavailable, but only when the employer has developed, documented, and incorporated a specific procedure that provides equivalent safety.

The employer must verify that the employee is not at the facility, make reasonable efforts to contact them, and ensure the employee knows the lock was removed before resuming work at the facility.

Cutting off a lock simply because production needs to restart is not an acceptable procedure.

Coordinate Contractors and Outside Personnel

Manufacturing facilities frequently use outside maintenance, electrical, mechanical, or equipment-service contractors.

When outside personnel perform work covered by the LOTO standard, the on-site employer and outside employer must inform each other of their respective energy-control procedures.

The host employer must also ensure its employees understand and comply with any restrictions and prohibitions associated with the contractor’s program.

This coordination should happen before servicing begins.

Address Testing and Positioning Carefully

Some maintenance activities require temporary reenergization so employees can test or position equipment.

OSHA permits this only under a controlled sequence.

Tools and materials must be cleared, employees moved to safe positions, LOTO devices removed according to the proper procedure, and the machine energized only for the necessary testing or positioning.

Afterward, the system must be deenergized and energy-control measures reapplied before servicing continues.

Testing should never become an informal shortcut around the LOTO procedure.

Make LOTO Procedures Easy to Access

A technically accurate procedure has limited value if employees cannot find it quickly.

Manufacturers should make current procedures readily available where servicing occurs.

Digital access, machine-mounted procedure stations, QR codes, or protected printed copies can all work depending on the environment.

Whatever system is used, revision control matters.

Employees should not be able to unknowingly follow an outdated procedure.

Use Visual Identification Where Helpful

Complex machines benefit from clear visual references.

Photographs can identify disconnects, valves, lock points, bleed locations, blocks, or verification points.

Consistent identification labels can also reduce confusion when several similar machines are installed in one area.

Visual tools should supplement—not replace—the written energy-control procedure.

Avoid Overly Generic Procedures

OSHA permits flexibility in how procedures are structured, and similar machines may sometimes share a procedure when their energy-control methods are genuinely equivalent.

However, generic instructions become dangerous when machines differ in energy sources or isolation sequence.

OSHA has acknowledged that comprehensive procedures may use supplemental machine-specific checklists or appendices where appropriate.

The goal should be standardization without sacrificing accuracy.

Integrate LOTO Into Maintenance Planning

Energy control should be planned before maintenance begins.

Work orders can identify whether LOTO is required, which procedure applies, what isolation devices are needed, and whether contractors or multiple crews will participate.

For shutdowns and major maintenance events, planning should also account for group lockout, shift transitions, temporary testing, and restart.

Arbill’s heavy industrial manufacturing, metal, steel, and fabrication safety solutions support facilities managing the complex combination of machinery, hazardous energy, PPE, training, and operational safety common in high-risk industrial environments.

Common LOTO Mistakes in Manufacturing

One recurring mistake is treating the machine stop button as an isolation device.

Another is locking out electricity while overlooking hydraulic, pneumatic, thermal, or gravitational energy.

Facilities may also use outdated machine procedures after controls have been modified.

Other common weaknesses include failing to verify zero energy, incomplete group lockout processes, poorly controlled shift handoffs, unauthorized lock removal, inadequate contractor coordination, and annual inspections that consist only of reviewing paperwork.

LOTO failures often result from small procedural gaps rather than a complete absence of a safety program.

That makes field observation particularly important.

Build a Culture Where Verification Is Expected

Employees should never feel pressured to skip LOTO because a maintenance task is “quick.”

The same expectation should apply whether the repair takes five minutes or five hours.

Supervisors should reinforce that employees have authority to stop and correct an inadequate isolation.

Management should also treat near misses involving unexpected movement, pressure, or energy as important program warnings.

A worker discovering residual energy during verification is evidence that the verification step worked—and potentially evidence that the procedure needs improvement.

A Practical LOTO Sequence

Although equipment-specific details vary, a strong manufacturing energy-control process follows a consistent framework:

1. Prepare for shutdown and identify the hazardous energy.
2. Notify affected employees.
3. Shut down the machine using normal controls.
4. Operate the appropriate energy-isolating devices.
5. Apply individual lockout or tagout devices.
6. Control or dissipate stored energy.
7. Verify that isolation is effective before beginning servicing.
8. Maintain personal control throughout the work.
9. Inspect the area and safely remove devices when servicing is complete.
10. Notify affected employees before normal operation resumes.

The details behind each step should come from the machine-specific energy-control procedure.

Conclusion

Lockout/tagout is one of the most important safeguards in a manufacturing maintenance program.

The strongest programs begin with a complete understanding of the equipment and every energy source that can injure workers.

From there, manufacturers should create clear procedures that identify isolation points, address stored energy, specify verification methods, and explain safe restoration.

Authorized employees need detailed training, affected employees need to understand the purpose and restrictions of LOTO, and procedures must be periodically inspected at least annually.

Group work, contractors, shift changes, testing, machine modifications, and absent-employee lock removal all require additional planning.

Most importantly, LOTO should never become a paperwork exercise.

When workers consistently isolate, lock, verify, and maintain personal control of hazardous energy before entering a danger zone, the program becomes what it is intended to be: a practical system that prevents unexpected startup and protects employees during some of manufacturing’s highest-risk work.