Last updated 2026-07-09
TL;DR
OSHA, a federal agency inside the U.S. Department of Labor, sets lockout/tagout requirements through 29 CFR 1910.147 for general industry. The standard makes employers keep a written energy control program, train employees, and use procedures to stop unexpected machine startup. In states with OSHA-approved state plans, a state agency enforces rules that must be at least as strict as federal OSHA's.
Which government entity actually writes the lockout tagout rules?
The Occupational Safety and Health Administration, OSHA, is the federal agency that writes and enforces lockout/tagout requirements. OSHA sits inside the U.S. Department of Labor and got its authority from the Occupational Safety and Health Act of 1970, which Congress passed and President Nixon signed into law on December 29, 1970. [1]
The specific lockout/tagout standard is 29 CFR 1910.147, titled "The Control of Hazardous Energy (Lockout/Tagout)." OSHA published the final rule in September 1989, and it took effect on January 2, 1990. [2] That standard applies to general industry, meaning manufacturing, food processing, utilities, warehousing, and similar workplaces.
Construction has a parallel requirement under 29 CFR 1926.417, and maritime work is covered under 29 CFR 1915.89. The core idea is identical across all three: before anyone services or maintains equipment, you shut off every energy source, lock it out so nobody can turn it back on, and verify the machine is actually de-energized before touching it.
No other federal agency writes the primary lockout/tagout rules. The Mine Safety and Health Administration (MSHA) runs a separate system for mining operations under Title 30 of the CFR, but if you're running a typical small business, OSHA's standard is the one that applies to you.
What is OSHA's authority and where does it come from?
OSHA's authority traces directly to the OSH Act of 1970, codified at 29 U.S.C. 651 et seq. Section 5(a)(1) of that Act, often called the General Duty Clause, says employers must provide "employment and a place of employment which are free from recognized hazards that are causing or are likely to cause death or serious physical harm." [1] That clause is the backstop when no specific standard exists.
For lockout/tagout, OSHA went further and issued a specific rule. That process, called notice-and-comment rulemaking, required OSHA to publish a proposed rule, take public comment, and issue a final rule in the Federal Register. Once in the CFR, that rule carries the force of law.
OSHA can inspect workplaces, issue citations, and levy fines. Lockout/tagout has drawn some of the agency's biggest penalties. The standard lands in OSHA's top 10 most cited standards every year. In fiscal year 2023, 29 CFR 1910.147 was the 5th most frequently cited standard, with 2,554 violations. [3]
OSHA writes the rule. OSHA inspectors enforce it. Federal courts interpret it when employers contest citations. That's the whole chain.
How do state OSHA plans change who enforces lockout tagout?
Twenty-two states and two territories run OSHA-approved State Plans that cover private employers. Another seven states have State Plans covering only state and local government workers. [4] In those states, a state-level agency, not federal OSHA, writes and enforces lockout/tagout rules.
State Plan states include California (Cal/OSHA), Michigan (MIOSHA), Washington (L&I), North Carolina, Virginia, Minnesota, and others. Each of these states must keep standards that are "at least as effective" as federal OSHA's, which in practice usually means identical or stricter. Cal/OSHA, for example, has its own lockout/tagout regulation at Title 8 CCR 3314, which is more detailed in some respects than 29 CFR 1910.147. [10]
If you operate in a State Plan state, check both the federal standard and your state's version. The table below shows states with approved State Plans and the relevant agency. In pure federal OSHA states (like Texas, Florida, and Georgia for private employers), federal OSHA inspectors handle enforcement directly.
| State Plan State | Enforcing Agency | Notes |
|---|---|---|
| California | Cal/OSHA (DIR) | Stricter in some areas; Title 8 CCR 3314 |
| Michigan | MIOSHA | Mirrors federal 1910.147 closely |
| Washington | L&I (WISHA) | WAC 296-803 |
| North Carolina | NC DOL / OSHA | Mirrors federal standard |
| Virginia | DOLI / VOSH | Mirrors federal standard |
| Minnesota | MNOSHA | Mirrors federal standard |
| Oregon | OR-OSHA | OAR 437-002-0175 |
| Arizona | ADOSH | Mirrors federal standard |
Not sure whether your state has a State Plan? OSHA keeps a current list at osha.gov. [4]
What does 29 CFR 1910.147 actually require employers to do?
The standard has five core requirements every covered employer must meet. None of them are optional if your workers service or maintain equipment that could unexpectedly energize.
First, you need a written energy control program. This is a facility-level document that describes the scope, purpose, and rules of your lockout/tagout system. 29 CFR 1910.147(c)(4) spells out exactly what that program must address. [2]
Second, you need equipment-specific energy control procedures for each machine that has more than one energy source or where the shutdown sequence isn't obvious. The standard includes a partial exemption for simple, single-energy-source equipment. Be careful relying on it. OSHA has cited employers who claimed the exemption when the equipment didn't actually qualify.
Third, you need to train three categories of employees: authorized employees (the ones who do the lockout), affected employees (the ones who operate the equipment), and other employees (anyone who works in an area where lockout is used). The training content differs for each group. For the full breakdown of what each group needs to learn, see the osha 1910.147 affected employee training requirements article.
Fourth, you must supply lockout hardware: locks, hasps, lockout blocks, tags, and anything else needed to physically secure energy-isolating devices. Tagout alone is only permitted when the equipment cannot be locked out and you document why.
Fifth, you must run an annual periodic inspection of each energy control procedure. An authorized employee who did not write the procedure has to review it with the employees who use it, and you have to certify that inspection in writing.
OSHA's standard also covers group lockout, contractor coordination, and shift changes. Those sections matter if you have complex operations or outside service contractors coming onto your site.
Does OSHA's lockout tagout standard cover construction workers?
Construction workers fall under a different part of the CFR. The construction lockout/tagout provision is 29 CFR 1926.417, "Lockout and tagging of circuits." It's shorter and less detailed than 1910.147. For years, OSHA has admitted the construction standard is thin compared to the general industry rule. [9]
OSHA has been working on a standalone construction lockout/tagout rule that would line up better with 1910.147. As of mid-2025, that rulemaking has not produced a final rule, so 1926.417 is still the controlling standard for construction. Check OSHA's regulatory agenda at osha.gov for current status.
If your business does both general industry work and construction work (common for facility maintenance contractors), the type of work being performed at any given moment determines which standard applies, not the employer's industry classification.
Why does OSHA consider lockout tagout so important? What's the injury data?
The numbers are stark. OSHA estimates that compliance with 29 CFR 1910.147 prevents roughly 120 fatalities and 50,000 injuries a year. [2] That figure comes from OSHA's regulatory impact analysis and shows up throughout the agency's own guidance.
The Bureau of Labor Statistics tracks fatalities from contact with objects and equipment, the category that captures most lockout-related deaths. In 2022, there were 741 fatal occupational injuries in that category. [5] Many involve machinery that restarted unexpectedly, which is exactly the scenario lockout/tagout is built to prevent.
OSHA also estimates that workers who service equipment face a fatality risk roughly 10 times higher than the average across all occupations. That's the agency's own internal estimate from the 1989 preamble to the final rule, so treat it as a directional figure rather than a current calculation. The direction is right.
The financial cost is real too. OSHA's current penalty structure allows fines up to $16,550 per serious violation and up to $165,514 per willful or repeated violation (figures adjusted for inflation as of January 2024). [6] A single inspection where the compliance officer finds missing procedures, no annual inspection documentation, and undertrained employees can produce a citation that runs into six figures.
What is a written energy control program and who has to have one?
Any employer whose workers service or maintain machinery where unexpected energization or startup could cause injury must have a written energy control program. That covers a huge range of businesses: food manufacturers, auto repair shops with lifts, printing companies, breweries, warehouses with conveyors, HVAC shops, you name it.
The written program has to describe the employer's intended method of compliance with 1910.147. Per 29 CFR 1910.147(c)(4)(ii), the program must include "specific procedural steps for shutting down, isolating, blocking and securing machines or equipment to control hazardous energy." [2] It also has to cover the steps for placing, removing, and transferring lockout or tagout devices, plus the requirements for testing equipment to confirm de-energization.
If you use a tagout-only system rather than lockout, the written program carries extra requirements. You have to show that tagout gives equivalent protection to lockout, which is a high bar.
Writing a standard-compliant energy control program is one of the areas where small businesses most often fall short. Either the program is generic and doesn't reflect actual equipment, or it exists on paper but nobody uses it. For a starting point already mapped to 1910.147's structure, SafetyFolio's safety program generator builds a customized written program in about 15 minutes based on your specific equipment and operations.
One honest note: even the best written program doesn't protect you unless your procedures match what's actually on your shop floor. OSHA compliance officers compare your written procedures against your real equipment. If the procedure says "turn the red valve" and there is no red valve, that's a problem.
How does OSHA enforce 1910.147 and what does an inspection look like?
OSHA compliance officers show up through a programmed inspection (random or industry-targeted), a complaint inspection (a current or former employee filed a complaint), or an incident investigation (someone got hurt). For lockout/tagout, complaint and incident inspections are by far the most common triggers.
During an inspection, the compliance officer asks to see your written energy control program first. No program means an immediate citation. Then they'll ask for your equipment-specific procedures, training records, annual inspection certifications, and lockout hardware inventory. They may also interview employees to check that training actually happened.
OSHA classifies violations as other-than-serious, serious, willful, or repeated. Most first-time lockout/tagout violations land as serious, meaning the compliance officer believes a substantial probability of death or serious physical harm exists. Penalties for serious violations run up to $16,550 per violation item. [6] Repeated violations, where the same employer has the same violation in a follow-up inspection, can be 10 times that.
OSHA Area Offices have some discretion on penalty amounts based on size of business, good faith, and history of violations. Small businesses with fewer than 25 employees may qualify for a 60% penalty reduction. Businesses with 26 to 100 employees may qualify for a 40% reduction. Those reductions don't apply to willful violations. [6]
If you get cited, you can contest the citation within 15 working days by filing a Notice of Contest with the OSHA Area Director. That sends the case to the Occupational Safety and Health Review Commission, an independent agency that adjudicates contested citations.
What is ANSI Z244.1 and does it have the force of law?
ANSI Z244.1 is the American National Standard for the Control of Hazardous Energy: Lockout, Tagout, and Alternative Methods. The American National Standards Institute publishes it through a consensus process involving industry, labor, and safety professionals. The most recent version is ANSI/ASSP Z244.1-2016. [12]
ANSI Z244.1 does not have the force of law on its own. It's a voluntary consensus standard. Employers are not legally required to follow it.
Where it matters: OSHA sometimes points to ANSI standards in letters of interpretation and enforcement guidance, and following a recognized industry consensus standard can be a factor when contesting a citation under the General Duty Clause. ANSI Z244.1-2016 also covers "alternative methods" like control reliable systems and LOTO-alternative procedures for repetitive tasks, which 29 CFR 1910.147 doesn't address in much detail. Some large manufacturers use those alternative methods, but they're hard to implement correctly and shouldn't be your starting point if you're building a lockout/tagout program from scratch.
Short answer: follow 29 CFR 1910.147 because it's the law. Know ANSI Z244.1 exists because it shapes industry best practice and occasionally shows up in OSHA guidance.
Are there OSHA letters of interpretation that clarify the lockout tagout standard?
Yes, quite a few. OSHA's letters of interpretation are official written responses to specific questions from employers, industry groups, or unions. They don't create new law, but they explain how OSHA reads the existing standard, and compliance officers treat them as guidance on how to apply the rules.
Some of the most useful letters for lockout/tagout address when the simple machine exception applies (spoiler: more narrowly than most employers assume), what counts as an adequate tagout-only program, how group lockout procedures must work when multiple crafts are involved, and how to handle contractor lockout coordination.
You can search OSHA's online letter of interpretation database at osha.gov. Search for "1910.147" and you'll find dozens of letters dating back to the early 1990s. [7] The more recent letters are generally better guides to current enforcement posture than letters from 20 or 30 years ago.
One specific letter worth knowing: OSHA's 2011 letter on the annual periodic inspection requirement confirms that the inspection must be documented and must involve the authorized employee who uses the procedure. It's more than a safety manager reviewing paperwork. That distinction trips up a lot of employers.
What happens when employees work near lockout tagout procedures but don't perform them?
These are what 1910.147 calls "affected employees" and "other employees." The training requirements for them are lighter than for authorized employees, but they're real requirements, not suggestions.
Affected employees, the people who operate equipment that gets locked out, must be trained to understand the purpose of the energy control program and why they cannot restart equipment that has a lock or tag on it. They don't need to know how to perform lockout, just why it exists and what happens if they remove someone else's lock (short answer: it's a terminable offense and potentially criminal).
Other employees, anyone who works in an area where lockout is used, must understand that they cannot attempt to restart or re-energize locked-out equipment. The training content is essentially the same as for affected employees in most programs.
The hazard communication training program at your facility is a useful parallel. Just as all workers near hazardous chemicals need some baseline awareness, all workers near energy-controlled equipment need baseline lockout awareness. The depth of training scales with the risk and the role.
How should a small business get started building a lockout tagout program?
Start with a machine inventory. Walk your facility and list every piece of equipment that requires service or maintenance and has an energy source (electrical, hydraulic, pneumatic, thermal, gravitational, or stored mechanical energy). Skip this step and you'll write procedures for some machines and miss others, which is a common citation pattern.
Next, for each machine on your list, identify every energy source and every isolation point (the switch, valve, or breaker that cuts each source). That information becomes the core of your equipment-specific procedure.
Then write your facility-level written energy control program. This is the document that describes your overall approach. Use 29 CFR 1910.147(c) as your checklist. It tells you exactly what the program must address.
After that, train your people. Authorized employees get full training on how to perform lockout. Affected employees get awareness training. Document all of it with names, dates, and what was covered.
Finally, set a calendar reminder for your annual periodic inspection. Pick a date, assign who conducts it, and create a simple certification form. OSHA compliance officers love finding missing annual inspection certifications because it's an easy citation.
If writing all of this from scratch feels like a full week of work, it doesn't have to be. SafetyFolio's safety program generator walks you through each piece in a structured format that produces a 1910.147-compliant written program based on your actual machines and operations. For most small businesses, it cuts the writing time from days to under an hour.
For workers who also operate forklifts in your facility, remember that forklift certification training requirements are a separate OSHA obligation under 29 CFR 1910.178(l), and forklift servicing also triggers lockout/tagout requirements.
Frequently asked questions
Is lockout tagout a federal or state requirement?
It's both, depending on where you operate. Federal OSHA sets the base requirement under 29 CFR 1910.147. In the 22 states with OSHA-approved State Plans, such as California, Michigan, and Washington, a state agency enforces its own lockout/tagout rule that must be at least as strict as the federal standard. In non-State Plan states, federal OSHA handles enforcement directly.
What CFR section covers lockout tagout?
The primary standard for general industry is 29 CFR 1910.147, the Control of Hazardous Energy. Construction falls under 29 CFR 1926.417. Maritime operations have a separate rule at 29 CFR 1915.89. If your business spans multiple industries, the type of work being performed at a given moment determines which standard applies, not your industry classification as an employer.
Does OSHA require a written lockout tagout program?
Yes. 29 CFR 1910.147(c)(4) explicitly requires a written energy control program. The document must describe the employer's method of compliance, including procedural steps for shutdown, isolation, and de-energization, plus rules for placing and removing locks and tags. A generic template that doesn't reflect your actual equipment won't satisfy a compliance officer during an inspection.
How often does OSHA cite lockout tagout violations?
Very often. In OSHA fiscal year 2023, 29 CFR 1910.147 was the 5th most frequently cited standard across all industries, with 2,554 citations issued. It has been in the top 10 nearly every year since the standard took effect in 1990. Common citation reasons include missing written programs, no equipment-specific procedures, inadequate training records, and missing annual periodic inspections.
Can you use tagout instead of lockout?
Only if the energy-isolating device is not capable of being locked out. That is a narrow exception. If you use tagout only, your written program must document why lockout is not feasible for each affected piece of equipment, and you must take additional protective measures to give tagout equivalent protection to lockout. OSHA scrutinizes tagout-only programs closely, and the bar is high.
What are the penalties for lockout tagout violations?
As of January 2024, OSHA can assess up to $16,550 per serious violation and up to $165,514 per willful or repeated violation. Small businesses with fewer than 25 employees may qualify for a 60% penalty reduction for non-willful violations. A single inspection finding missing procedures, no training records, and no annual inspection certifications can easily produce multiple citation items totaling tens of thousands of dollars.
Does OSHA's lockout tagout rule apply to contractors?
Yes. When outside contractors perform service or maintenance on your equipment, 29 CFR 1910.147(f)(2) requires the host employer and contractor to inform each other of their respective energy control procedures. You must ensure outside contractors understand and follow your lockout rules, or you understand and follow theirs. You cannot simply hand a contractor a lock and assume coordination is complete; it requires documented communication.
What training does OSHA require for lockout tagout?
OSHA requires three levels of training. Authorized employees must learn how to perform energy control procedures for the specific machines they service. Affected employees must learn the purpose of the program and that they cannot restart locked-out equipment. Other employees in the area need basic awareness. All training must be equipment-specific enough that employees can recognize hazardous energy sources and understand the methods of control.
What is the annual periodic inspection requirement in 1910.147?
29 CFR 1910.147(c)(6) requires that each energy control procedure be reviewed at least annually. The inspection must be performed by an authorized employee other than the one who uses the procedure, and it must involve the employees who use that procedure. You must certify the inspection in writing, including the date, the equipment inspected, the names of employees involved, and the name of the person who performed the inspection.
Does ANSI Z244.1 replace OSHA's lockout tagout standard?
No. ANSI Z244.1 is a voluntary consensus standard with no force of law. OSHA's 29 CFR 1910.147 is the legally enforceable standard. ANSI Z244.1 covers some areas, like repetitive-task alternative methods, that 1910.147 doesn't address in detail, and compliance officers may reference it, but it does not substitute for regulatory compliance. Always build your program around 1910.147 first.
Which OSHA standard covers lockout tagout for construction?
Construction lockout/tagout falls under 29 CFR 1926.417, which is much shorter and less detailed than the general industry standard at 1910.147. OSHA has been working on a fuller construction-specific lockout/tagout rule for years, but as of mid-2025 no final rule has been issued. Workers doing construction work are covered by 1926.417; workers doing general industry maintenance work at a construction site would likely fall under 1910.147.
How do I find out if my state has its own lockout tagout rules?
OSHA maintains a current list of State Plan states and their contact information at osha.gov. If your state is on that list, visit that state agency's website to find its specific lockout/tagout regulation. California, Washington, and Oregon in particular have regulations with requirements that differ in meaningful ways from the federal standard, so check the state rule directly rather than assume it mirrors 1910.147.
What is the simple machine exception to lockout tagout?
29 CFR 1910.147(c)(4)(i) allows employers to use a single written procedure for a group of machines rather than machine-specific procedures when the machines are the same, have the same type and magnitude of hazardous energy, and use the same isolation and de-energization method. The exception for not needing a written procedure at all for simple, single-energy-source machines is narrower than most employers assume, and OSHA letters of interpretation confirm it applies only in very limited circumstances.
Can employees share a single lock during group lockout?
No. In group lockout situations, 29 CFR 1910.147(f)(3) requires that each authorized employee affix a personal lockout or tagout device to the group lockout device, such as a hasp, before beginning work. Each employee must be able to verify their own lock is in place. The purpose is that no single person can remove everyone's protection; each worker's safety depends on their own lock, not a supervisor's lock.
Sources
- U.S. Department of Labor, Occupational Safety and Health Act of 1970: The OSH Act of 1970 grants OSHA authority to set workplace safety standards and defines the General Duty Clause requiring employers to provide workplaces free from recognized hazards.
- OSHA, 29 CFR 1910.147 Control of Hazardous Energy (Lockout/Tagout): 29 CFR 1910.147 is the federal standard requiring written energy control programs, equipment-specific procedures, employee training, and annual periodic inspections. OSHA estimates compliance prevents roughly 120 fatalities and 50,000 injuries annually.
- OSHA, Top 10 Most Frequently Cited Standards FY2023: In fiscal year 2023, 29 CFR 1910.147 was the 5th most frequently cited OSHA standard, with 2,554 violations cited.
- OSHA, State Plans: 22 states and 2 territories operate OSHA-approved State Plans covering private employers; 7 additional states have plans covering only state and local government employees.
- Bureau of Labor Statistics, Census of Fatal Occupational Injuries Summary 2022: In 2022, 741 fatal occupational injuries resulted from contact with objects and equipment, the category that captures most machinery-related lockout/tagout fatalities.
- OSHA, Penalties: As of January 2024, OSHA maximum penalties are $16,550 per serious violation and $165,514 per willful or repeated violation; small employers may qualify for penalty reductions.
- OSHA, Letters of Interpretation for 1910.147: OSHA has issued numerous letters of interpretation for 29 CFR 1910.147 clarifying requirements such as the simple machine exception, tagout-only programs, group lockout, and contractor coordination.
- OSHA, 29 CFR 1926.417 Lockout and tagging of circuits: 29 CFR 1926.417 is the construction industry lockout/tagout standard; it is less detailed than the general industry standard at 1910.147 and OSHA has not yet finalized a fuller construction rule.
- California Department of Industrial Relations (DIR), Cal/OSHA Title 8 CCR 3314: California's lockout/tagout regulation at Title 8 CCR 3314 is enforced by Cal/OSHA and is more detailed in some requirements than the federal 29 CFR 1910.147 standard.
- OSHA, OSH Act Section 5(a)(1) General Duty Clause: Section 5(a)(1) of the OSH Act requires employers to provide employment and a workplace free from recognized hazards causing or likely to cause death or serious physical harm.
- American Society of Safety Professionals (ASSP), ANSI/ASSP Z244.1-2016: ANSI/ASSP Z244.1-2016 is a voluntary consensus standard covering control of hazardous energy including alternative methods; it does not carry the force of law but informs industry best practice.