The Most Common Lockout/Tagout Mistakes (and How to Fix Them)
Most lockout/tagout failures are not exotic. They are the same handful of program gaps OSHA cites thousands of times a year — and the same gaps that show up in severe injury reports. Here are the most common mistakes, why they happen, and how to fix each one.
1. No machine-specific procedures
The single most-cited LOTO violation. A generic "disconnect power before service" poster is not a procedure. Machines with multiple energy sources or stored energy need their own documented sequence with exact isolation points. Fix: inventory your equipment, prioritize by hazard, and write machine-specific procedures — starting with the machines serviced most often.
2. Skipping the verification step
Isolating without verifying is a gamble. The try-start check (attempt to start the machine after lockout), test gauges, and voltage checks are what confirm zero energy. Fix: make verification an explicit, numbered step in every procedure and treat skipping it as a stop-work offense.
3. Ignoring stored and residual energy
Pneumatic accumulators, hydraulic pressure, springs, flywheels, capacitors, and gravity-loaded parts can injure even after the disconnect is open. Fix: audit each machine for stored energy and add explicit release, block, or restraint steps with verification.
4. Tag-only lockouts
A tag is a warning, not a lock. Tagout-only programs are only allowed when the isolating device cannot accept a lock — and then require equivalent additional measures. Fix: supply the right lockout devices (breaker locks, valve clamps, hasps) so every point can be physically locked.
5. Out-of-date procedures
Equipment changes — new drives, added actuators, relocated panels — silently invalidate procedures. An out-of-date procedure teaches the wrong isolation points. Fix: tie procedure review to management-of-change and the annual inspection, and keep the current version accessible at the point of work.
6. Contractor and group lockout gaps
Outside contractors and multi-crew jobs need coordination: who locks what, who holds the keys, when the machine may restart. Fix: include contractor LOTO obligations in your program and use group lockboxes so every individual applies their own lock.
7. Training and record-keeping shortfalls
Untrained or lapsed employees, missing annual inspection certifications, and no record of retraining are easy citations. Fix: schedule training and annual inspections on a calendar, keep certifications on file, and make records easy to produce for an auditor.
Key takeaways
- Machine-specific procedures are the #1 cited requirement — start there.
- Verification and stored-energy steps are where injuries actually happen.
- Devices, contractor rules, and records close the remaining gaps.
- A digital system keeps procedures current and audits on schedule.
Frequently asked questions
What is the most common lockout/tagout OSHA violation?
Failure to develop, document, and use machine-specific energy control procedures under 1910.147(c)(4). It consistently tops the LOTO citation list, followed by periodic inspection and training violations.
Can an employee remove their own lock for someone else?
No. Locks may only be removed by the employee who applied them, except through a documented emergency-removal procedure that verifies the employee is not on site before the lock is cut.
How do we handle shift changes during a lockout?
The standard requires documented procedures for shift or personnel changes that ensure continuous protection — commonly lock exchanges or group lockboxes with arriving employees adding their locks before departing ones remove theirs.
Manage lockout/tagout procedures digitallyTegis Safety keeps procedures current and audit-ready.
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