Top 10 Lockout Tagout Mistakes That Cause Workplace Accidents
Workplace machinery can become dangerous within seconds when hazardous energy is not properly controlled. Electrical power, hydraulic pressure, compressed air, steam, mechanical movement, and stored energy can all cause serious injuries during maintenance or repair. This is why lockout tagout is an essential part of workplace safety in industrial facilities worldwide. Yet, accidents can still happen when employees rush procedures, overlook an energy source, or use unsuitable LOTO equipment. Understanding these common mistakes can help safety managers, maintenance teams, and employers build safer working practices. In this guide, Lukko Safety explains the top 10 lockout tagout mistakes and practical ways to prevent them.
What Is Lockout Tagout?
Lockout Tagout, commonly called LOTO, is a safety procedure used to isolate hazardous energy before machinery is serviced, repaired, cleaned, or maintained. It involves shutting down equipment, isolating energy sources, applying appropriate locks and tags, releasing stored energy, and verifying that the equipment cannot operate.
OSHA states that unexpected energization, startup, or release of stored energy can result in serious injuries, including burns, crushing, electrocution, amputations, and fractures.
While requirements differ between countries and industries, the basic safety principle remains the same: equipment must be made safe before anyone works on it.
Top 10 Lockout Tagout Mistakes
1. Not Identifying Every Energy Source
One of the most dangerous mistakes is assuming that switching off the main electrical supply makes equipment completely safe.
Machines may have multiple energy sources, including:
- Electrical energy
- Hydraulic pressure
- Pneumatic pressure
- Mechanical energy
- Thermal energy
- Chemical energy
- Gravity or stored energy
A maintenance worker may lock the electrical disconnect but overlook compressed air or hydraulic pressure still present in the system.
How to prevent it: Prepare a machine-specific energy control procedure that identifies every hazardous energy source before maintenance begins.
2. Relying Only on a Warning Tag
A tag communicates danger, but it does not physically prevent equipment from being operated. Where an energy-isolating device can be locked out, applicable requirements generally favor lockout unless an equivalent level of protection is demonstrated.
Using only a tag because it is quicker can therefore create unnecessary risk.
Better approach: Use suitable lockout devices together with clearly visible tags as part of a complete LOTO procedure.
3. Skipping the Verification Step
Applying a lock and assuming the machine is safe is not enough. Workers need to verify that isolation has actually been achieved before starting maintenance.
Verification may involve checking controls, testing for electrical energy using appropriate methods, or confirming that pressure has been released.
OSHA specifically requires verification of isolation and deenergization before work begins.
4. Ignoring Stored or Residual Energy
Energy can remain even after a machine has been switched off. A press may retain hydraulic pressure, a flywheel may continue moving, or a suspended component may fall because of gravity.
This is one of the most frequently overlooked aspects of lockout tagout safety.
Workers should identify, release, disconnect, restrain, or otherwise control stored energy before maintenance. If energy can build up again, isolation may need to be continuously verified.
5. Using the Wrong Lockout Equipment
Improvised or unsuitable devices may not securely isolate machinery. Ordinary padlocks, damaged tags, makeshift ties, or hardware not designed for industrial conditions can compromise a LOTO program.
Proper lockout equipment should be durable, standardized, substantial, and identifiable.
Using purpose-designed lockout tagout devices helps workers apply procedures consistently across different machines and work areas.
6. Failing to Train Employees Properly
Providing locks and tags does not automatically create a safe workplace. Employees need to understand when LOTO is required, how hazardous energy behaves, and how isolation procedures must be followed.
OSHA requires relevant employees to receive training appropriate to their roles, including recognition of hazardous energy sources and the methods used to isolate and control them.
Training should also be refreshed when equipment, procedures, or work responsibilities change.
7. Removing Another Employee's Lock Without Proper Procedures
In group maintenance situations, removing someone else's lock can create an extremely serious hazard. The employee who placed the lock may still be working on the machine or may not know that it has been removed.
Companies should have a documented procedure for exceptional circumstances involving lock removal, including confirming that the employee is safely away from the equipment and properly notifying affected personnel.
Clear responsibility for lock placement, removal, and transfer should be included in energy control procedures.
8. Poor Communication During Group Lockout
Multiple employees may work on the same machine during a shutdown. If one person believes the equipment is isolated while another does not, the consequences can be severe.
Group LOTO should clearly define:
- Who is responsible for the shutdown
- Which energy sources are isolated
- Who has applied locks
- How workers are added or removed
- How everyone is notified before re-energization
Good communication is just as important as the physical lockout devices.
9. Treating LOTO as a One-Time Procedure
A lockout tagout program can become ineffective when procedures are written once and never reviewed. Machines change, new equipment is installed, processes are modified, and employees change roles.
Periodic inspections help identify weaknesses before they contribute to an accident. OSHA's hazardous energy requirements include an energy control program, employee training, and periodic inspections.
Review procedures whenever significant changes are made and conduct regular checks to confirm that workers are following them correctly.
10. Rushing to Restart Equipment
The final mistake happens when maintenance is complete and workers are eager to restart production. A rushed restart can be just as dangerous as an incomplete shutdown.
Before re-energizing equipment, workers should ensure that:
- Tools and temporary materials have been removed.
- Guards and safety devices are restored where required.
- Employees are safely positioned.
- Affected workers are notified.
- Locks and tags are removed according to the established procedure.
- The equipment is restarted using the correct process.
A few additional minutes spent checking the area can prevent a serious incident.
How to Build a Safer Lockout Tagout Program
An effective LOTO program should combine procedures, training, communication, inspections, and reliable equipment. Written procedures should clearly explain how machinery is shut down, isolated, secured, and verified. OSHA's guidance specifically calls for procedures covering shutdown, isolation, blocking, securing, device placement and removal, and verification.
For organizations operating across different countries, it is also important to understand the safety and legal requirements applicable in each location rather than relying on one standard for every facility.
Why Quality LOTO Equipment Matters
Even the best procedure can be weakened by poor-quality hardware. Locks, tags, hasps, circuit breaker lockouts, valve lockouts, and other devices should be suitable for the environment in which they are used.
Lukko Safety provides lockout tagout solutions designed to support safer energy isolation practices across industrial and workplace environments worldwide. Choosing appropriate equipment and combining it with proper training and procedures can make LOTO a practical part of everyday workplace safety.
Conclusion
Most lockout tagout mistakes are preventable. Failing to identify all energy sources, skipping verification, ignoring stored energy, using unsuitable equipment, and rushing the restart process can expose workers to unnecessary danger. A strong LOTO program should make safe isolation a routine part of every maintenance activity.
For dependable lockout tagout equipment and safety solutions suitable for workplaces worldwide, explore the solutions offered by Lukko Safety and strengthen your approach to hazardous energy control.
Frequently Asked Questions
Failing to identify and isolate every hazardous energy source is one of the most serious mistakes. Workers may shut down the main power while another source, such as hydraulic, pneumatic, thermal, or stored mechanical energy, remains active.
Verification confirms that the equipment is actually isolated and cannot unexpectedly start or release hazardous energy. It provides an important safety check before maintenance work begins.
Requirements vary by jurisdiction and situation. Under OSHA’s general industry standard, when an energy-isolating device is capable of being locked out, lockout is generally required unless a tagout system provides equivalent protection.
Authorized employees who perform servicing or maintenance are responsible for applying lockout or tagout devices under the applicable energy control procedure.
Depending on the equipment, hazardous energy can include electrical, mechanical, hydraulic, pneumatic, chemical, thermal, gravitational, and other stored or residual energy.
