What does lockout tagout mean? A plain-English guide

Last updated 2026-07-09

What does lockout tagout actually mean?

Lockout tagout, almost always shortened to LOTO, is a set of steps that shut off and secure the energy powering a machine before anyone repairs, cleans, or maintains it. The point is blunt: you can't get caught in a machine that has no power.

The "lockout" part means putting a physical lock on an energy-isolating device, like a breaker, valve, or disconnect switch, so the equipment cannot be turned back on. The "tagout" part means hanging a warning tag on that device when a lock can't be installed. A tag says "do not operate," but unlike a lock it holds nothing back. That's why OSHA prefers lockout whenever the isolating device can accept a lock ^[1].

Hazardous energy comes in more forms than most people expect. Electrical is the obvious one. LOTO also covers mechanical energy stored in springs or rotating parts, hydraulic and pneumatic pressure, thermal energy, chemical energy, and gravitational energy from suspended loads or equipment raised on lifts. Any of it can let go without warning if you don't control it.

The phrase "zero energy state" names the goal: every source verified at zero before work starts. That verification step is the line between a real LOTO program and one that only looks good on paper.

What OSHA standard covers lockout tagout?

The governing rule is 29 CFR 1910.147, titled "The Control of Hazardous Energy (Lockout/Tagout)." It applies to general industry. Construction has its own energy control rules in 29 CFR 1926 subpart K, and maritime work falls under 29 CFR 1915 ^[1].

OSHA also publishes a long compliance directive, CPL 02-00-147, that tells inspectors exactly how to judge a LOTO program ^[10]. Read it and you'll know what an inspector wants before anyone shows up.

Electrical work gets a second layer from 29 CFR 1910.333, which covers safe work practices around electrical hazards. The two standards overlap, and OSHA can cite both when a situation calls for it ^[9]. If your people touch anything electrical, learn both.

One detail catches people. 29 CFR 1910.147 says it does not apply to "minor tool changes and adjustments" that are routine, repetitive, and integral to normal production, as long as other safeguards protect the work. Don't stretch that exception. OSHA's letters of interpretation have said again and again that most servicing and maintenance tasks, even quick ones, fall under the standard ^[2].

How many workers are injured or killed by hazardous energy every year?

OSHA's own training materials put the toll at roughly 50,000 injuries and 120 fatalities a year from failures to control hazardous energy ^[3]. Those numbers have run through OSHA publications for years, though the agency admits the underlying data is soft, because many incidents get coded by the energy type rather than as a LOTO failure.

The Bureau of Labor Statistics tracks fatal injuries by event. Contact with objects and equipment, the caught-in and caught-between deaths LOTO is built to prevent, accounted for 722 worker deaths in 2022 ^[4]. Not all of those trace to LOTO, but the category shows the scale of it.

OSHA also estimates that following 29 CFR 1910.147 would prevent about 2 percent of all workplace deaths and roughly 10 percent of serious injuries in covered industries ^[3]. For a small business the math is plain. One incident can cost more in workers' comp, downtime, and penalties than a full LOTO program ever would.

LOTO violations land in OSHA's top-ten citation list nearly every year. In fiscal year 2023, 29 CFR 1910.147 ranked seventh, with more than 2,500 violations issued ^[5].

What are the main components of a lockout tagout program?

29 CFR 1910.147(c) spells out the required pieces. Every covered employer needs all of them, not the handful that feel convenient.

Written energy control program. A documented policy describing how your facility controls hazardous energy. It has to state the scope of the program, name which employees are authorized to perform LOTO, and set the rules and techniques for controlling energy ^[1].

Machine-specific energy control procedures. For each piece of equipment that needs LOTO, you write a procedure listing every energy source, its type and magnitude, the isolating device location, and the steps to reach zero energy state. OSHA allows an exception when equipment has a single, easily identified energy source that can be fully de-energized and locked out with one device. Inspectors pick at that exception hard. When in doubt, write the procedure.

Authorized and affected employee training. Authorized employees are the ones who apply LOTO. Affected employees run the locked-out equipment or work around it. Both groups train, but on different things. Authorized employees learn how to apply, release, and transfer LOTO. Affected employees learn why they can't restart a machine that carries a lock or tag ^[1].

Annual program inspections. At least once a year, a certified employee (usually a supervisor or safety manager) has to review each energy control procedure and certify in writing that it was checked, the date of the review, and the employees involved ^[1]. This is one of the most commonly missed requirements.

Lockout/tagout hardware. Locks, tags, hasps, lockout boxes, and valve devices all get provided by the employer, used only for LOTO, and built tough enough for the environment. Tags have to be standardized and legible. Locks have to be individually keyed, one key per authorized employee.

What is the correct sequence for applying lockout tagout?

The standard doesn't lock you into a numbered sequence by name, but OSHA training materials and the compliance directive lay the steps out plainly. Most practitioners group them into six phases.

1. Preparation. Identify every energy source on the equipment, locate every isolating device, and gather the right lockout hardware.

2. Notification. Tell affected employees that LOTO is about to happen and the equipment is going down.

3. Equipment shutdown. Use the normal stopping procedure to bring the equipment to a full stop.

4. Energy isolation. Operate every isolating device to cut the equipment off from its energy sources.

5. Lockout or tagout application. Apply your personal lock (or a tag if a lock can't be used) to each isolating device.

6. Stored energy release and verification. Release or restrain any residual energy: bleed hydraulics, discharge capacitors, block elevated parts. Then verify zero energy state before work begins, by trying the start button, reading pressure gauges, or metering electrical systems.

When the work is done, the release sequence reverses. Remove tools and materials, make sure everyone's clear, take off locks in the reverse order they went on, notify affected employees, and restore energy.

One point trips up small shops. If more than one authorized employee works on the same equipment at once, each person applies their own personal lock. Group lockout devices (hasps) hold several locks on a single isolating device. No one removes another person's lock, ever, except under a documented emergency or shift-change procedure.

What is the difference between lockout and tagout?

This is the most common mix-up in LOTO training. The two are not interchangeable options.

A lockout device is a physical restraint. It stops the isolating device from being operated. A padlock on a breaker or a valve lockout on a ball valve makes it impossible to restore energy without removing the lock, and the only key belongs to the authorized employee who put the lock on.

A tagout device is only a warning. It's a tag on the isolating device saying the equipment may not be operated. It stops nothing physically. A determined (or oblivious) person can still flip that breaker.

OSHA's standard says tagout may only be used when the isolating device can't accept a lock, or when the employer can demonstrate that the tagout program provides a level of safety equivalent to lockout ^[1]. That "equivalent level of safety" bar is hard to clear in practice, and inspectors know it.

The practical rule is short. If you can lock it, lock it. Tags alone are a last resort, not a preference.

When tagout is used, you have to add measures to cut the odds of accidental energization: pulling a circuit breaker, removing valve handles, or adding warning mechanisms. It's messier and harder to defend to an inspector than just installing hardware that takes a lock.

Who needs lockout tagout training, and how often?

Training requirements under 29 CFR 1910.147(c)(7) cover three groups.

Authorized employees (the ones who apply LOTO) have to recognize hazardous energy sources, know the type and magnitude of energy in their workplace, and understand the methods for isolating and controlling it.

Affected employees (the ones who run the equipment or work nearby) have to understand the purpose of LOTO and the ban on restarting or re-energizing locked or tagged equipment.

Other employees who work in areas where LOTO is used have to understand they can't try to restart or re-energize equipment that's locked or tagged.

On frequency: the standard requires retraining when you have reason to believe an employee doesn't understand the procedure, when a new machine or process comes in, or when the procedure itself changes ^[1]. There's no calendar interval for routine retraining written into .147 the way some other standards spell one out, but the annual program inspection creates a natural checkpoint where gaps surface.

Training has to be documented. OSHA wants a certification record with the employee's name, the training date, and the subject. Keep those records. Inspectors ask for them.

If you're building broader OSHA training for your crew, our OSHA training guide covers what's required across several standards beyond LOTO.

What equipment is covered by the lockout tagout standard?

The standard covers any machine or equipment where unexpected energization, startup, or release of stored energy could hurt someone ^[1]. That reaches an enormous range of equipment in a typical manufacturing, food processing, warehousing, or maintenance shop.

Common covered equipment includes conveyor systems, press machinery, injection molding machines, air compressors, mixers and agitators, forklifts (when being serviced), HVAC equipment, and packaging machinery, plus any powered equipment that needs maintenance beyond normal operation. Even something small, like a bench grinder or a commercial dishwasher, can require LOTO when maintenance exposes energized parts.

OSHA exempts cord-and-plug equipment when unplugging it fully de-energizes it and the authorized employee keeps exclusive control of the plug during servicing. A worker who unplugs their own grinder and holds the plug while changing a wheel has controlled the energy without a formal procedure. But if the plug is out of reach, or there are other energy sources, you're back under .147.

If your facility runs forklifts, note that forklift certification requirements are separate from LOTO. Forklift servicing and repair, though, falls squarely under .147. You need both programs.

Oil and gas operations, hot tap work, and electric utilities have added or alternative standards, but for most general industry workplaces, 29 CFR 1910.147 is the rule.

What are the OSHA penalties for lockout tagout violations?

OSHA penalty amounts adjust every year for inflation. As of 2024, the maximum for a serious violation is $16,131 per violation, and the maximum for a willful or repeated violation is $161,323 per violation ^[6].

Inspectors usually find several violations in one LOTO inspection, because the standard has so many required pieces. An employer with no written program, no machine-specific procedures, and no training records can draw separate citations for each gap. A small operation could realistically face combined penalties of $50,000 to $100,000 from a single inspection if the program is basically missing.

Willful violations, where OSHA shows the employer knew of the hazard and did nothing reasonable to fix it, carry the higher ceiling and can trigger a criminal referral in a fatality case. The Occupational Safety and Health Act allows criminal prosecution for a willful violation that kills a worker, with fines up to $10,000 and up to six months in prison for a first offense ^[7].

State-plan states run their own OSHA programs and have to be at least as effective as federal OSHA on penalties. Some, like California's Cal/OSHA, set higher maximums.

The financial case is simple. A real program costs time and hardware. The absence of one can run past six figures before you count litigation, workers' comp, and lost production.

How do you write a lockout tagout program for a small business?

Start with your equipment inventory. Walk every machine in your facility and list any that need maintenance, cleaning, or repair beyond just turning them off. For each one, identify every energy source: electrical circuits, pneumatic lines, hydraulic systems, spring-loaded components, all of it.

From that inventory you build the written program first, then the machine-specific procedures. The written program is your policy: who's authorized to perform LOTO, what hardware you use, how group LOTO works, what happens when a shift changes mid-lockout, and how you handle outside contractors. 29 CFR 1910.147(c)(1) requires the written program to cover all of it.

Machine-specific procedures are the working instructions for each piece of equipment. A good one fits on a page: a description of the machine, the location and type of each isolating device, the type and magnitude of energy, and the step-by-step sequence to reach zero energy state. Appendix A to 1910.147 includes a sample procedure format, free, and worth using as a template ^[8].

Then train your people, document that training, and set a calendar reminder for your annual procedure inspections.

If writing all of this from scratch sounds like a weekend project you keep pushing off, SafetyFolio's safety program generator walks you through LOTO and your other required written programs in about 15 minutes, and hands you documents you can put in front of an inspector.

One honest caveat. A generic template off the internet is a starting point, not a finished product. Your machine-specific procedures have to match your actual equipment. An inspector spots it instantly when your procedure describes a valve that doesn't exist in your building.

How does lockout tagout apply to contractors and outside workers?

Small businesses get blindsided here. When outside contractors work at your facility on equipment subject to LOTO, 29 CFR 1910.147(f)(2) creates a coordination requirement.

The outside employer and the on-site employer have to inform each other of their LOTO procedures. The on-site employer has to make sure outside personnel understand and follow the energy control procedures for the facility ^[1]. You can't just hand over the equipment and assume the contractor has a compatible program.

In practice that usually means a documented pre-work meeting where you walk the contractor through your LOTO procedures for the specific equipment, confirm their procedures won't create hazards for your workers, and settle who owns which isolation steps. Keep a written record of that coordination.

When a contractor's employees will work alongside yours on the same equipment, group lockout applies. Everyone working on the equipment puts their own lock on a hasp or lockout box. No exceptions.

That coordination requirement is also why your written LOTO program should address contractor work by name. Inspectors look for it.

What is the difference between LOTO and alternative methods like machine guarding?

LOTO and machine guarding aren't substitutes. They cover different phases of work.

Machine guarding (under 29 CFR 1910.212 for general industry) keeps workers from contacting hazardous machine parts during normal operation ^[11]. Guards, barriers, and two-hand controls keep people safe while the machine runs as designed.

LOTO is for when the machine is not running as designed, when someone has to get inside the danger zone to service, maintain, unjam, or clean it. The moment a worker reaches past where a guard normally sits, or has to work on internal components, normal guarding falls short and LOTO is required.

Some alternative energy control methods exist for narrow situations. OSHA's standard allows certain repetitive tasks with safeguards to use methods other than full LOTO, but those alternatives are tightly defined and heavily scrutinized. The auto industry, for one, has negotiated specific alternative procedures with OSHA for certain robotics maintenance tasks. Those are formal program approvals, not informal workarounds.

For a typical small business the rule is easy. If your employee reaches into a machine to service it, and that machine has a power source, LOTO is probably what's required. When in doubt, applying LOTO is the safer answer, for your workers and your inspection record both.

Seeing how LOTO fits your broader hazard communication and safety program pays off more than tackling one standard at a time in isolation.

Frequently asked questions

Is lockout tagout required by OSHA for all businesses?

29 CFR 1910.147 applies to general industry employers where workers service or maintain equipment with hazardous energy sources. If your employees ever perform maintenance, repair, or cleaning on powered equipment, you almost certainly fall under the standard. Business size is not an exemption. Even a five-person shop with one piece of powered equipment needs a written program if workers service that equipment.

Can a tagout alone replace a lockout?

Only when the energy-isolating device physically cannot accept a lock. OSHA's 29 CFR 1910.147 requires tagout-only programs to demonstrate a level of safety equivalent to lockout, which usually means added safeguards like removing actuating components or blocking energy. In practice, most equipment can take lockout hardware, and inspectors expect you to use it. Tags alone are a last resort.

How often does a lockout tagout program need to be reviewed?

At minimum once per year per energy control procedure, under 29 CFR 1910.147(c)(6). The annual inspection has to be done by an authorized employee other than the one using the procedure, and documented with the date, the equipment, and the employees involved. Retraining is also required whenever a procedure changes or an employee shows a knowledge gap, regardless of the calendar.

What hardware does an employer need to provide for LOTO?

Employers have to provide locks, tags, hasps, and any other energy-isolating devices needed to implement LOTO. Locks must be individually keyed: one key, one authorized employee. Hardware has to be durable for the environment (corrosives, moisture, and temperature extremes all matter), standardized within the facility, and used only for energy control, never for general security.

What happens when the worker who applied the lock isn't available to remove it?

Your written LOTO program has to include a procedure for removing a lock when the authorized employee is unavailable. That procedure typically requires management authorization, a documented attempt to reach the employee, verification that removal is safe, and notification to the employee when they return. The lock cannot simply be cut without this procedure in place and documented.

Does lockout tagout apply to electrical work specifically?

Yes, but electrical work is also covered separately by 29 CFR 1910.333. The two standards overlap, and OSHA can cite both. Electricians working on systems de-energized through LOTO are protected by 1910.147. Work on energized systems falls mainly under 1910.333 and related electrical safety standards. For most small businesses, the safest approach is de-energize, lock out, and verify before any electrical maintenance.

What qualifies as "authorized" vs. "affected" employees under LOTO?

An authorized employee is trained to apply and remove LOTO devices and actually performs the servicing or maintenance. An affected employee operates the equipment or works in an area where LOTO is applied but does not perform the locking out. Both groups train, but at different depth. Authorized employees have to fully understand energy control. Affected employees mainly need to know not to interfere with locked or tagged equipment.

Does lockout tagout apply to cord-and-plug equipment?

OSHA exempts cord-and-plug equipment from 29 CFR 1910.147 when unplugging it fully de-energizes it and the authorized employee keeps exclusive control of the plug during the entire servicing period. If there are additional energy sources, if the plug is out of reach, or if the employee can't hold control of the plug, the exemption doesn't apply and full LOTO procedures are required.

How do you handle lockout tagout when multiple people are working on the same machine?

Group lockout uses a hasp or lockout box that accepts multiple individual locks. Each authorized employee places their own personal lock on the hasp. Work cannot finish until every person removes their own lock. No one removes another employee's lock under any normal circumstance. The written program has to document the group procedure and name a primary authorized employee responsible for each phase.

What is the OSHA penalty for a lockout tagout violation in 2024?

As of 2024, OSHA's maximum penalty for a serious violation is $16,131 per violation. Willful or repeated violations can reach $161,323 per violation. Because a single LOTO inspection usually turns up several deficiencies (missing written program, no machine-specific procedures, no training records), combined penalties in the tens of thousands of dollars are common even for first-time inspections.

Do contractors working at my facility need to follow my lockout tagout program?

Under 29 CFR 1910.147(f)(2), the on-site employer and the outside employer have to inform each other of their LOTO procedures and make sure their programs don't create hazards for each other's workers. You are responsible for making sure contractors understand the energy control procedures for your equipment. A documented pre-work coordination meeting is the standard way to satisfy this requirement.

Does lockout tagout cover hydraulic and pneumatic systems, or only electrical?

It covers far more than electrical. 29 CFR 1910.147 reaches all forms of hazardous energy: hydraulic, pneumatic, mechanical, thermal, chemical, and gravitational. Stored pressure in hydraulic and pneumatic systems has to be bled and verified at zero before work begins. Gravity energy from suspended parts or elevated equipment has to be blocked or restrained. Electrical is the most common type, but the standard is broader by design.

Sources

1. OSHA, 29 CFR 1910.147 The Control of Hazardous Energy (Lockout/Tagout): Requirements for written energy control program, machine-specific procedures, authorized/affected employee training, annual inspections, and the preference for lockout over tagout
2. OSHA, OSH Act of 1970 (complete text) and 1910.147 applicability to servicing and maintenance tasks: OSHA interpretations confirm that most servicing and maintenance tasks fall under 1910.147 even when they are brief; the minor adjustment exception is narrow
3. OSHA, Control of Hazardous Energy – Lockout/Tagout (OSHA 3120): Approximately 50,000 injuries and 120 fatalities per year attributed to failure to control hazardous energy; compliance would prevent roughly 2 percent of all workplace fatalities
4. Bureau of Labor Statistics, Census of Fatal Occupational Injuries Summary, 2022: Contact with objects and equipment accounted for 722 worker deaths in 2022
5. OSHA, Commonly Used Statistics / Top 10 Most Cited Standards, Fiscal Year 2023: 29 CFR 1910.147 ranked seventh in OSHA's top-ten citation list for fiscal year 2023 with more than 2,500 violations issued
6. OSHA, Penalties (maximum penalty amounts adjusted for 2024): Maximum penalty for a serious violation is $16,131 per violation; maximum for willful or repeated violation is $161,323 per violation as of 2024
7. OSHA, OSH Act of 1970, Section 17 – Penalties: Criminal prosecution for willful violations causing worker death: fines up to $10,000 and up to six months imprisonment for a first offense
8. OSHA, 29 CFR 1910.147 Appendix A – Typical minimal lockout procedure: OSHA's sample energy control procedure format for machine-specific procedures
9. OSHA, 29 CFR 1910.333 – Electrical, selection and use of work practices: Electrical work is also covered by 1910.333, which can be cited alongside 1910.147 for electrical maintenance violations
10. OSHA, Compliance Directive CPL 02-00-147 – Inspection procedures for the LOTO standard: CPL 02-00-147 instructs inspectors on how to evaluate LOTO programs; reading it reveals what an inspector will look for
11. OSHA, 29 CFR 1910.212 – General requirements for all machines (machine guarding): Machine guarding covers protection during normal operation; LOTO covers servicing and maintenance when guards are bypassed