OSHA 1910.147 Periodic Inspection: 2026 Annual LOTO Audit Checklist

Published April 30, 2026 by LOTO Compliance

If your facility runs energy-isolated maintenance under OSHA's lockout/tagout standard, the periodic inspection clause at 29 CFR 1910.147(c)(6) is the single most-cited paragraph after the basic written-program requirement itself. We see it almost every week in OSHA enforcement summaries. The good news: it's a structural problem, not a hard one. Most plants fail because nobody owns the calendar, not because the procedures are wrong.

This guide walks through what the standard actually says, what an OSHA inspector wants to see in your binder (or your software), and a sample checklist plant managers can use to run their own inspections. If you'd rather hand the work to a third party who can sign the certification as an independent reviewer, we offer a fixed-fee annual LOTO audit that produces the documentation OSHA expects.

What 29 CFR 1910.147(c)(6) Actually Requires

The standard reads in plain language for once. Three obligations stack up:

1. Frequency. Each energy control procedure must be inspected at least every 12 months.
2. Independence. The inspection must be performed by an authorized employee other than the one using the procedure being inspected.
3. Certification. The employer must certify in writing the machine or equipment, the date, the employees observed, and the inspector who performed the inspection.

For procedures involving lockout, the inspection has to include a review with each authorized employee of their responsibilities under the procedure. For tagout-only systems (rare in modern manufacturing, but they exist on legacy equipment), the review must include both authorized and affected employees, because tagout depends more heavily on awareness.

OSHA's own enforcement data, summarized each fall on the agency's Top 10 Most Frequently Cited Standards page, has put 1910.147 in the top five every year for more than a decade. Periodic inspection is consistently one of the largest sub-bucket citations within that.

Who Is Qualified to Run the Inspection

An "authorized employee" under 1910.147(b) is anyone who locks or tags out machines to perform service or maintenance. The inspector has to be authorized, has to be trained per 1910.147(c)(7), and cannot be the person currently using the procedure under review. Three options work in practice:

• A maintenance lead inspecting a procedure used by a different shift's maintenance team.
• An EHS manager who is also trained as an authorized employee. This is common at facilities with one EHS resource and a small maintenance crew.
• A third-party consultant who meets the authorized-employee training requirement. We do this for facilities that have only one or two trained internal people, where independence inside the building is impossible.

What does not work: signing your own certification, having a corporate safety person who's never been trained on your equipment perform the review, or letting an electrical contractor sign off as a favor.

What an OSHA Inspector Asks For

When OSHA shows up, whether it's a programmed inspection, a complaint response, or a post-incident visit, the LOTO portion of the document request follows a predictable order. Here's what typically lands on the conference room table within the first hour:

• The written energy control program required by 1910.147(c)(4).
• The list of all machines and equipment covered by documented procedures.
• Periodic inspection certifications for the past three years, organized by procedure.
• Authorized employee training records and retraining documentation per 1910.147(c)(7).
• The procedure for one or two specific machines the compliance officer will pick from a walk-through.

Inspectors cross-check the dates. If the equipment list has 47 procedures and the certification binder has 41, that gap is a citation. If a procedure was last certified 14 months ago, that's a citation. If the certification names an inspector who left the company a year before the date on the document, that's a falsification finding, which escalates fast.

The Annual Periodic Inspection Checklist

Use this on a per-procedure basis. We give clients a longer version inside the binder we deliver, but this captures the core checks.

Common Deficiencies We Find in the Field

Across roughly 60 audits we've completed in the last two years across automotive supply, food and beverage, plastics, and metals operations, the same five issues come up over and over.

Most of these are fixable in a single audit cycle. The deeper issue is usually management of change. When engineering swaps a hydraulic accumulator or adds a servo axis, the LOTO procedure should be revised that week, not at the next annual inspection. ANSI Z244.1-2016 calls this out explicitly in its alternative methods section, and it's the single biggest gap between a paper-compliant program and a real one.

Building the Inspection Schedule

If you have 50 documented procedures, doing all 50 in one week per year is expensive and disruptive. We recommend spreading them across the calendar based on risk and use frequency:

• Quarterly for high-risk equipment: presses with stored mechanical energy, robot cells, processes with multiple energy sources or hazardous chemicals.
• Semiannually for medium-risk: conveyors, packaging lines, welders.
• Annually for everything else, with the inspection date staggered so no calendar week carries more than a handful of inspections.

The 12-month maximum from 1910.147(c)(6) is a floor, not a ceiling. More frequent inspections on high-risk equipment are good practice and they get caught up in OSHA's general duty clause expectations under Section 5(a)(1) if an incident exposes a known hazard.

Documentation: Paper, PDF, or Software

OSHA does not specify the format. A binder of paper certifications is acceptable and we still see it at smaller facilities. A shared drive of PDFs is fine if naming and folder structure make documents retrievable. Purpose-built LOTO software is the best fit for multi-site or high-procedure-count operations, because it forces a date field, a signature, and a renewal alert into the workflow.

Whatever you use, three rules apply: certifications must be retrievable in minutes during an inspection, every procedure must tie to a current certification, and the certification has to identify the inspector by name (not just a department).

How an Independent Audit Helps

Some facilities run the periodic inspection internally and only bring in outside help when leadership wants a third-party check before a regulatory visit, an insurance audit, or after a near-miss. Others contract the entire inspection out because internal independence is impossible.

When we run an annual LOTO audit, the deliverable is the certification document OSHA expects, plus a deficiency log, a re-training plan, and a written summary leadership can present to corporate or insurance. We use the same checklist style above, scaled to facility size, and we sign as the inspector under 1910.147(c)(6). Pricing depends on procedure count and facility complexity. You can see the structure on our annual LOTO audit service page.

Whether you run it internally or hire a partner, the outcome OSHA cares about is the same: every procedure gets observed, every observation gets documented, every deficiency gets fixed.

Frequently Asked Questions

How often does OSHA 1910.147 require a periodic inspection of energy control procedures?

OSHA 1910.147(c)(6)(i) requires the employer to certify a periodic inspection of each documented energy control procedure at least every 12 months. The 12-month clock runs from the last certified inspection date, not from the calendar year, so a procedure inspected on May 14 must be re-inspected by the following May 14 to stay compliant.

Who is qualified to perform an OSHA 1910.147 periodic inspection?

The inspection must be performed by an authorized employee who is not currently using the procedure being inspected. That person must be trained per 1910.147(c)(7) and able to verify the procedure works as written. Outside consultants commonly act as the inspector when no internal staff member meets the independence and training criteria.

Do we need a separate periodic inspection for every piece of equipment?

OSHA expects an inspection for each documented energy control procedure, not necessarily each machine. If 12 identical CNC mills share one procedure, one observation can certify the procedure, but the inspector should sample multiple authorized employees and machines. Non-identical equipment with unique isolation steps each need their own procedure and their own inspection.

What does an OSHA inspector ask for first when auditing LOTO?

The first request is almost always the written energy control program plus the periodic inspection certifications for the past three years. Inspectors compare the dates on those certifications against the equipment list and training roster. Missing or stale certifications are a fast track to a 1910.147(c)(6) citation, which sits in OSHA's annual top ten.

Can a periodic inspection be combined with employee retraining?

Yes, and many facilities do. The inspection still has to be a real review of procedure effectiveness, with a sample of authorized employees actually executing the steps. Stapling a sign-in sheet from a refresher class to a procedure does not satisfy 1910.147(c)(6). Document the observation, the inspector, the date, and any deficiencies found.

What happens if the periodic inspection finds a deficiency?

The employer must correct the deficiency before workers continue using the procedure. Common findings include outdated equipment lists, missing isolation points after a retrofit, and authorized employees skipping the verification step. Document the corrective action, retrain affected employees, and re-issue the procedure with a new revision date and certification.