LOTO Exclusive Control Exception: Conditions, Limits, and Penalties

You can rely on the cord-and-plug lockout/tagout exception only when two things are true at the same time: unplugging the machine eliminates every form of hazardous energy, and the plug stays under your exclusive control for the entire time you are servicing the equipment. When both conditions hold, 29 CFR 1910.147 does not apply to that work, which means no written energy control procedure and no formal periodic inspection for that machine.¹ Miss either condition and full lockout/tagout is back in play.

The Two Conditions, In Plain Terms

The regulation itself is short. The lockout/tagout standard “does not apply” to servicing cord-and-plug connected electric equipment when exposure to unexpected startup is controlled by unplugging the equipment, and the plug is under the exclusive control of the employee performing the work.¹

Both prongs are required. A machine you can unplug but that still holds hydraulic pressure fails the first prong. A machine that goes fully dead when unplugged but whose plug is out of sight around a corner fails the second. The exception is all-or-nothing.

“Cord-and-plug connected” means the equipment draws power through a removable plug into an outlet. Portable tools like bench grinders and handheld drills qualify. So do stationary items like a small table saw or drill press wired to a receptacle. Hard-wired equipment does not qualify, no matter how small or simple it is.¹

Zero Energy After Unplugging

Pulling the plug has to leave the machine unable to move, cycle, or release energy of any kind. This is where the analysis most often goes wrong, because a machine can be electrically dead and still dangerous.

Common disqualifiers:

Capacitors that hold an electrical charge long after the cord is pulled.
Hydraulic or pneumatic pressure trapped in a cylinder or accumulator.
Springs under tension, or counterweights held in a raised position.
Thermal energy in heated elements or molten material.

If any of these are present after unplugging, the machine does not qualify. Full lockout/tagout applies, including the requirement to relieve, disconnect, or restrain stored or residual energy before work begins.¹

What “Exclusive Control” of the Plug Means

A 1993 OSHA interpretation letter defines exclusive control as the worker’s ability to prevent the equipment from being re-energized during servicing. The plug meets that standard in one of three ways:

Physically in your possession, held or on your person.
Within arm’s reach and in your line of sight at all times.
Secured with a lockout/tagout device on the plug end, such as a locking cap or cord lock that keeps anyone else from reconnecting it.²

The third option carries the most practical weight in busy shops. If coworkers walk past the outlet while you work, arm’s reach and line of sight may not really keep the plug safe. A plug lock physically prevents someone from reconnecting the cord while you are inside the machine.

Verify Before You Touch Anything

Even when you are sure the machine qualifies, confirm it is dead before your hands go near a moving part. OSHA’s verification sequence: after unplugging and making sure no one is in a danger zone, try to start the machine with its normal operating controls. If nothing happens, the machine is confirmed de-energized. Return the controls to off before beginning work.³

It takes a few seconds and catches the situations that are easy to overlook, like a backup battery or an internal power supply you forgot the machine had.

The Exception Ends When a Second Worker Joins

The regulation refers to “the employee” performing the service in the singular. Two people cannot both have exclusive control of the same plug at the same time.¹

Once a second worker is servicing the same cord-and-plug machine, the employer has to switch to full lockout/tagout, including group lockout provisions. Each worker applies a personal lockout device to the energy-isolating point, so no single person can restore power while anyone else is still exposed. Shops that correctly use the exception for solo work sometimes forget to shift procedures when a helper joins in, and audits catch it.

Servicing and Maintenance Only

The exception applies to servicing or maintenance, not to normal production. OSHA defines servicing and maintenance broadly: installing, setting up, inspecting, adjusting, repairing, lubricating, cleaning, unjamming, and tool changes — any activity where the worker may be exposed to unexpected startup or energy release. Normal production is governed by machine guarding standards under Subpart O instead. When a servicing task happens during production and a worker must remove a guard or reach into a danger zone, lockout/tagout protections apply, and the cord-and-plug exception can simplify compliance if the machine qualifies.⁴

One boundary worth flagging: the cord-and-plug exception is not the same as the minor servicing exception. The minor servicing exception covers routine, repetitive tasks that are integral to production and requires alternative protective measures such as specially designed tools, interlocked barrier guards, or local disconnects under the worker’s exclusive control.⁵ The cord-and-plug exception, by contrast, is not limited to minor or routine work and can cover major repairs, as long as both of its conditions are met.

Written Procedures and Training

Because qualifying cord-and-plug work sits outside 29 CFR 1910.147 entirely, the standard’s requirements for written energy control procedures and formal training do not apply to that specific machine.¹ That is a regulatory point, not a safety one. Workers still need to know which machines actually qualify, what exclusive control means, and how to verify zero energy. Without that grounding, people assume every plug-in machine qualifies, including ones with hydraulic accumulators or backup batteries that clearly do not.

Document your analysis of which machines meet both conditions and which do not, even though nothing requires it in writing. When an OSHA compliance officer asks why a particular machine has no lockout procedure, “it meets the cord-and-plug exception” holds up only if you can show you evaluated the machine against both prongs.

What Getting It Wrong Costs

Misapplying the exception, or claiming it for equipment that does not qualify, can result in a serious violation with a penalty up to $16,550. If OSHA finds the employer knew the exception did not apply and used it anyway, the violation becomes willful, with a maximum penalty of $165,514 per instance. Repeat violations carry the same $165,514 ceiling. These figures adjust for inflation each year.⁶

The dollar amounts are usually the smaller problem. Lockout/tagout failures cause an estimated average of 120 workplace fatalities per year and thousands of injuries. A machine that restarts because a coworker plugged it back in does not care whether the employer misread the regulation in good faith. Working through both prongs honestly, every time, is the whole point of the exception.

1
Occupational Safety and Health Administration. 29 CFR 1910.147 – The Control of Hazardous Energy (Lockout/Tagout)
2
Occupational Safety and Health Administration. Cord and Plug Connected Electric Equipment
3
Occupational Safety and Health Administration. 29 CFR 1910.147 Appendix A – Typical Minimal Lockout Procedure
4
Occupational Safety and Health Administration. Relationship of 1910.147 to Subpart O – Normal Production Operations vs. Servicing and/or Maintenance
5
Occupational Safety and Health Administration. Minor Servicing Exception
6
Occupational Safety and Health Administration. 2025 Annual Adjustments to OSHA Civil Penalties