A lockout/tagout periodic inspection is the annual check OSHA requires under 29 CFR 1910.147(c)(6): an authorized employee who does not use a given energy-control procedure reviews it against how it is actually performed, sits down with each authorized employee to review their responsibilities under it, and documents and fixes any deviations. It certifies that the procedure still works, not that it exists.
Writing a good lockout/tagout procedure is the well-known part. The periodic inspection is the part plants skip, do late, or reduce to a signature on a form. That gap matters, because procedures drift: a machine gets a new isolation point, an operator invents a faster way to bleed pressure, a step that made sense two years ago is now skipped by everyone. The annual inspection is how you catch drift before it catches a hand. This guide is educational, not legal advice.
What does 1910.147(c)(6) actually require?
Four things, and each one has teeth. First, frequency: the inspection happens at least annually for each energy-control procedure. Second, independence: it is performed by an authorized employee other than the ones using the procedure being inspected, you cannot inspect your own procedure. Third, the employee review: the inspector reviews each authorized employee's responsibilities under the procedure with that employee. Fourth, certification: the employer certifies that the inspection was done, and the certification identifies the machine or equipment, the date, the employees included, and the inspector.
There is a wrinkle for tagout. Where tagout is the energy-control method rather than lockout, the review must include each authorized and affected employee, and it must cover the limitations of tags spelled out in the standard, because a tag is a warning, not a physical block, so everyone near the equipment needs to understand it. Lockout reviews cover authorized employees; tagout reviews reach wider.
How is the periodic inspection different from writing the procedure?
They answer different questions. Writing the procedure answers “how should this machine be de-energized and verified?” The periodic inspection answers “is that actually what happens, and does everyone who does it understand their part?” A plant can have flawless written procedures in a binder and fail the inspection requirement completely, because the inspection is about live practice and documented review, not about the quality of the document.
This also means the inspection frequently improves the procedure. When the inspector watches the isolation done and talks it through with the crew, the gaps surface: an energy source the procedure never listed, a verification step people skip because the bleed valve is awkward, a lock that lives in the wrong place. Those findings feed back into a procedure revision. The inspection is the maintenance cycle for your energy-control program.
Think of it the way you think of preventive maintenance on the machine itself. You do not wait for a bearing to seize; you inspect it on a schedule and act on what you find. An energy-control procedure wears the same way, not physically, but through the slow accumulation of undocumented shortcuts and quiet equipment changes. The (c)(6) inspection is that scheduled check, and the deviations it turns up are the early warning that the procedure and the machine have started to disagree.
Who should perform the inspection?
An authorized employee, someone trained and qualified to lock out that type of equipment, who does not use the specific procedure being inspected. In a small plant that usually means peers inspect each other's procedures, or a maintenance lead inspects an operator's, or a safety coordinator who is also an authorized employee runs them. The independence rule exists for a plain reason: the person who runs a procedure daily stops seeing the shortcut they have baked into it. A second set of qualified eyes catches what habit hides.
The inspector needs enough standing to write down an uncomfortable finding. If the inspection is done by someone who cannot flag the shift lead's workaround without repercussions, it will find nothing, which is worse than not doing it, because now you have a certificate that says the procedure is fine.
Scheduling is the other practical hurdle. A plant with a hundred distinct energy-control procedures cannot inspect them all in one week without turning the exercise into a rubber stamp, so most operations spread the inspections across the year, a handful each month, weighted so the highest-risk and most frequently used procedures come up first and, ideally, more than once. Build the schedule around the procedure, not the machine: two machines that share an identical procedure can often be covered together, while one machine with several isolation scenarios may need each scenario reviewed. The goal is that every procedure gets a real, unhurried review inside the twelve-month window, with a simple tracker showing which are done and which are due.
How do you run a lockout/tagout audit?
Run it as a structured pass through each procedure, not a hallway conversation. The ordered routine below covers the (c)(6) requirements and the practical checks that make the inspection worth doing.
- Pull the procedure and the equipment. Bring the written energy-control procedure to the machine. Confirm the machine still matches the document, same energy sources, same isolation points, same devices.
- Watch or walk the isolation. Have the authorized employee perform or talk through the full sequence: notify, shut down, isolate every energy source, apply locks and tags, release or block stored energy, and verify zero energy before work.
- Check every energy source. Electrical is the obvious one; confirm the procedure also handles hydraulic, pneumatic, thermal, gravity, chemical, and stored energy in springs, capacitors, or raised loads.
- Review responsibilities with each authorized employee. Face to face, confirm each person knows their role. For tagout, include affected employees and the limitations of tags.
- Record deviations. Note anything that differs from the written procedure, a skipped verification, a missing isolation point, a device that no longer fits, as a specific deficiency, not “needs work.”
- Certify and assign corrections. Complete the certification (machine, date, employees, inspector), open a corrective action for each deviation, and trigger retraining where knowledge gaps appeared.
Feed the deficiencies into the same corrective-action loop you use elsewhere, and let them inform your next job safety analysis for servicing tasks. A LOTO periodic inspection is narrow by design; a broader workplace safety audit should confirm the LOTO inspections themselves are happening on schedule and that findings actually close.
What are the most common findings?
Auditors and inspectors see the same handful of gaps year after year. The certification exists but the review did not, someone signed the form without sitting down with the crew. A procedure is missing an energy source, most often stored hydraulic pressure or a gravity load that can drop. The machine changed and the procedure did not follow. Locks and tags are standardized on paper but a mix of personal padlocks shows up in practice. And group lockout gets loose: a crew works under one person's lock instead of each authorized employee applying their own.
None of these are exotic. They are the predictable result of a program that wrote procedures once and never inspected them. The annual review is the mechanism the standard built in precisely to catch them, which is why treating it as a formality defeats its purpose. Findings that touch machine access often also point back at machine safeguarding methods if a guard has to come off to service the machine, the LOTO procedure and the guarding review belong on the same page.
What do the numbers say?
The stakes and the rule, from the primary sources:
- The full text of the standard, including the periodic-inspection requirement, is at 29 CFR 1910.147.
- OSHA's lockout/tagout eTool walks through the periodic-inspection requirements and certification content in plain language.
- The control of hazardous energy is consistently among OSHA's most-cited general-industry standards, and contact with hazardous energy remains a leading cause of the fatalities counted in the Bureau of Labor Statistics' injury and fatality data.
The periodic inspection is cheap insurance against the most expensive failure in the plant. It costs an afternoon per procedure and it catches the drift that turns a written control into a false sense of safety.
The hard part is proving it happened and keeping the findings from evaporating. When certifications live on loose forms and corrective actions live in someone's memory, the next auditor cannot tell a real inspection from a signed one. Harmony is an AI-native layer that connects machines, software, and paperwork into one operational layer, with no rip-and-replace, so a periodic inspection becomes a structured record tied to the machine, date, employees, inspector, and every open deficiency, that AI search can surface by machine or by procedure, the everyday shape of connected worker technology. Harmony's digital workflows move those certifications and corrective actions into structured data; it is not a compliance product, but it keeps the record where the work is. See the CLS case study.