What Is LOTO? Lockout/Tagout Types, Steps, and Violations

Most LOTO programs document every step, post the procedure on the wall, and stock the right devices. Yet they fail at the one action that confirms the system works. OSHA citations cluster where energy control is written but not checked, and the gap between your procedure and what happens on the floor is where serious injuries occur.

The LOTO meaning is straightforward: it’s the set of procedures that keep machines from starting up or releasing stored energy while someone is servicing them. Putting it into practice is the hard part. A solid lockout/tagout program needs more than posted steps and device lists. Compliance depends on documented procedures for each piece of equipment, trained authorized employees who know how to apply and verify isolation, and retraining triggers that catch drift before an inspector does.

This guide covers what OSHA requires, the six steps of a complete LOTO procedure, the energy types and devices your program must control, and the violations that draw the most citations, so you can close the gaps before your next audit. It follows OSHA standard 1910.147.

Main takeaways

• Lockout/tagout (LOTO) controls seven types of hazardous energy, each requiring a specific isolation method and device.
• The six-step LOTO procedure hinges on two often-skipped actions: releasing stored energy and verifying isolation through tryout. These are among the most commonly missed steps and a frequent source of serious incidents.
• The most-cited LOTO violations cover machine-specific energy control procedures, training records, and annual periodic inspections.
• Only authorized employees may apply and remove LOTO devices. Affected employees must recognize an active lockout but never remove it.
• Retraining is required when a change in equipment or procedures introduces a new hazard, or when an inspection or other evidence shows an employee has gaps in their knowledge or is not following the procedures.

LOTO types: hazardous energy and lockout/tagout devices

Each type of LOTO matches a specific hazardous energy source and isolation method, and the right device and the right person must align with it. Getting any one wrong, the energy class, the hardware, or the person applying it, creates a gap in your energy control procedure before work begins.

Types of hazardous energy that require LOTO

The phrase “types of LOTO” is shorthand for the hazardous energy groups your program must control. Each one calls for a distinct isolation approach, and your machine-specific procedures need to account for every source on the equipment. The table below maps all seven.

Lockout vs. tagout: when each applies

Lockout secures an energy-isolating device in the safe position with a physical lock, such as a circuit breaker, valve, or disconnect switch. A LOTO tag attaches to the isolating device as a warning but does not block operation on its own. OSHA’s default rule is lockout whenever the device can accept a lock. Tagout alone is allowed only when the equipment cannot accept one, and then the employer must prove tagout delivers equal protection.

Standard lockout tagout hardware includes keyed padlocks assigned to each authorized employee. Hasps let multiple workers secure the same isolation point, lockout stations keep devices stored and ready, and durable tags show who placed them and when.

Group LOTO

When a crew services the same equipment, a hasp at each isolation point lets every authorized employee attach their own lock. The machine stays locked out until the last person removes their lock, and no one removes a lock that is not theirs. That rule is absolute under 1910.147. Under 29 CFR 1910.147, authorized employees are trained to apply and remove LOTO devices, while affected employees work on or near the equipment but do not perform the lockout. Confusing these roles is one of the fastest ways to draw a citation.

When is LOTO required, and when is it not?

Under 29 CFR 1910.147, LOTO applies whenever servicing or maintenance exposes a worker to the unexpected startup or energization of equipment, or the release of stored energy. The test is simple: if a machine could start on its own, or stored energy could be released and harm someone, lockout/tagout is required. That covers most repair and setup work, clearing jams, removing or bypassing guards, and working inside electrical enclosures.

When LOTO is not required

OSHA recognizes a few narrow exceptions. The most commonly misapplied is the minor servicing exception, which exempts a task from full LOTO only when all three of these conditions hold:

• the task occurs during normal production operations,
• it is routine, repetitive, and integral to that production, and
• alternative measures provide effective protection, such as guarding or a control reliable enough to prevent unexpected energization.

Miss any one of the three and full LOTO applies. A separate cord-and-plug exception covers equipment whose only energy source is the plug, as long as the worker keeps the unplugged cord under their exclusive control. Treat both exceptions narrowly: if there is any doubt that stored energy is fully controlled or that the alternative protection is genuinely effective, default to full lockout/tagout.

The 6 steps of a LOTO procedure

A lockout/tagout procedure should include the following six steps:

1. Preparation
2. Shutdown
3. Isolation
4. Lockout/tagout
5. Stored energy check
6. Isolation verification

Let’s look at each of these steps of LOTO safety more closely in the sections below.

Lockout/Tagout Step 1: Preparation

The first step of locking and tagging out equipment for service and maintenance is to prepare. During the preparation phase, the authorized employee must investigate and gain a complete understanding of all types of hazardous energy that might be controlled. In addition, it’s important to identify the specific hazards and of course means for controlling that energy.

Lockout/Tagout Step 2: Shut Down and Notify

With planning complete, the actual process of powering down and locking out machines begins.

At this point, it’s time to shut down the machine or equipment that will be serviced or maintained. Another important part of this step is to inform any employee affected by the shutdown, even if they won’t play a role in the service or maintenance. An example of affected employees include machine operators who need to know that their machine should not be operated, or any other employees, visitors, or contractors who would be working in the area.

Lockout/Tagout Step 3: Isolation

The next step of the lockout/tagout procedure is to isolate the machine or equipment from any source of energy.

This may mean any number of things, such as turning off power at a breaker or shutting a valve.

Lockout/Tagout Step 4: Lockout/Tagout

With the machine or equipment isolated from its energy source the next step of lockout/tagout is to actually lock and tag out the machine. It’s fair to say that this entire six-step process takes its name from this step.

During this step, the authorized employee will attach lockout and/or tagout devices to each energy-isolating device. The point is to apply the lockout device on the energy-isolating device in a way so it says in the “safe” position and cannot be moved to the unsafe position except by the person performing the lockout.

Tagout refers to applying a tag on the device as well. This tag includes the name of the person who performed the lockout and additional information.

Lockout/Tagout Step 5: Stored Energy Check

During step 5 of lockout/tagout, workers must carefully inspect equipment for stored or residual energy. Stored energy may remain in the form of compressed air, hydraulic pressure, steam, springs, or even gravity (such as elevated machine parts.) Residual energy, though reduced, can still cause severe harm if unexpectedly released.

During step 5 of lockout/tagout, do not assume all hazards are eliminated after the main energy source is disconnected. Instead, release, block, or restrain any stored or residual energy before proceeding. Failure to do so can result in equipment movement, electrical shock, or physical injury.

Lockout/Tagout Step 6: Isolation Verification

This last step is all about making sure.

Yes, you’ve shut down the machines, isolated them from their source of power, locked them out, and checked for hazardous stored energy. But now’s the time to double-check that you did it all right and it’s now safe to work on the machine or equipment.

At this point, an authorized employee verifies the machine has been properly isolated and de-energized.

The example images shown above are all from one of our two online Lockout-Tagout training courses. We have one for Affected Employees and a second for Authorized Employees.

LOTO program requirements, violations, and training

Building a lockout/tagout program that holds up to an OSHA inspection means getting three things right: the written requirements, the procedures that cause the most violations, and the training that prevents them.

What OSHA requires in a written LOTO program

Your written energy control program under 29 CFR 1910.147 centers on a few core elements: scope and purpose, procedural rules, machine-specific energy control procedures, employee training, and periodic inspections at least once a year. In FY2024, OSHA recorded 2,443 LOTO violations, making it the fifth most-cited standard. The most-cited sections show exactly where programs collapse.

The violations concentrate in three subsections: machine-specific energy control procedures under 1910.147(c)(4), training and communication under (c)(7), and annual periodic inspections under (c)(6).

The financial stakes add up fast. As of 2026, a single serious LOTO violation can cost up to $16,550, and willful or repeat violations up to $165,514 per instance, per OSHA’s penalty schedule. When an inspection covers multiple machines, citations stack, and six-figure totals are not unusual. OSHA also renewed its National Emphasis Program on Amputations in Manufacturing in June 2025, effective for five years, so inspectors are actively targeting LOTO procedures, inspection logs, and training records at manufacturing sites.

LOTO training requirements and retraining triggers

Section 1910.147(c)(7) splits training by role. Authorized employees need hands-on instruction covering hazardous energy, isolation methods, and the specific procedures for every machine they service. Affected employees need enough training to recognize when LOTO is active and to know they can never try to re-energize locked-out equipment.

OSHA requires retraining in two situations. The first is when a change in job assignment, equipment, or procedures introduces a new hazard. The second is when a periodic inspection or other evidence shows, or the employer has reason to believe, that an employee has gaps in their knowledge or is not following the energy control procedures.

Platforms like Vector LMS let safety teams assign role-based LOTO courses, separate authorized from affected training, and monitor completions across sites. The system flags when retraining triggers are met, creating records that hold up during an inspection.

Procedures, training, and periodic inspections are the three most-cited LOTO sections, and they are also the three program elements most within your direct control. Strengthen them before an auditor arrives.

Close LOTO gaps and build a solid program with Vector Solutions

The six steps of a complete LOTO procedure, including the verification step most programs shortcut, are mapped out above, and your written program can now address the compliance gaps OSHA cites most often before an inspector finds them. Vector LMS delivers role-specific LOTO training to authorized and affected employees, tracks completions across every site, and fires retraining triggers on its own when conditions change. The result is steady energy control at every location, backed by records that stand up to an OSHA audit.

Frequently asked questions about LOTO

What does LOTO stand for?

LOTO stands for lockout/tagout. It means equipment is physically locked out from its power sources and tagged to warn others, all to protect workers from hazardous energy during servicing or maintenance.

What is the LOTO procedure?

The LOTO procedure is a standardized process for making sure machines are properly shut off and cannot restart until maintenance is finished. It is the step-by-step method of preparing, isolating, locking out, releasing stored energy, and verifying energy sources to keep employees safe from unexpected energy release.

What are the 6 steps of LOTO?

Prepare; shut down and notify affected employees; isolate energy sources; apply lockout/tagout; release stored energy; and verify isolation through tryout.

What should you not do during step 5 of lockout/tagout?

During step 5, do not skip the stored or residual energy check. Never assume equipment is safe simply because the power switch is off. Always release, block, or restrain stored energy, such as hydraulic pressure, compressed air, or gravity, before moving to verification.

What happens if equipment has no lockout point?

When an energy-isolating device cannot accept a lock, OSHA permits tagout-only, but the employer must show equal protection through added safeguards. Document the reason and the backup controls, such as closer oversight, extra barriers, or procedural steps, and apply stricter annual inspection and training. The goal is to prove the alternate method delivers the same level of protection.

How do I verify LOTO on equipment with multiple energy sources?

Isolate and lock out each energy source one by one, then verify each: tryout for electrical controls, and physical checks for mechanical, hydraulic, pneumatic, and stored energy. Use a checklist that maps to your machine-specific procedure, and for complex equipment, assign one authorized employee to lead verification across all energy types before work begins.

Do I need separate LOTO procedures for every piece of equipment?

Yes, if equipment has different energy sources, isolation points, or shutdown sequences. OSHA 1910.147(c)(4)(i) requires machine-specific procedures unless equipment shares the same type and magnitude of energy, the same isolation methods, and the same sequence. Group similar machines under one procedure only when the energy control steps are truly identical, and document the grouping reason.

What counts as a retraining trigger under OSHA?

OSHA mandates retraining in three cases: a supervisor observes someone not following the procedure, there is reason to believe an employee’s knowledge is inadequate, or job roles, equipment, or procedures change. “Inadequate knowledge” includes near misses, incident findings, or periodic inspection results that reveal gaps. Document the trigger event and the retraining date to show compliance during audits.

Can I track LOTO training completions and periodic inspections in one system?

Yes. Platforms like Vector LMS combine role-based LOTO training, completion tracking, and automatic reminders, and EHS modules can schedule and document annual periodic inspections in the same place. Unified tracking cuts the risk of missing retraining triggers or inspection deadlines that often draw OSHA citations.