Cord-and-Plug Equipment and the OSHA 1910.147 Lockout Exemption: When Unplugging Is Enough

Published July 9, 2026 by LOTO Compliance

This is the exception that gets stretched. A maintenance tech pulls a plug, walks around a corner to clear a jam, and calls it lockout. It is not, and it is one of the easier findings for an inspector to write. The cord-and-plug exception in 1910.147 is real and useful, but it is narrow, and it rests entirely on a phrase most programs never define: exclusive control. Get that phrase wrong and a routine task turns into an unexpected-energization hazard, which is exactly what the standard exists to prevent.

This guide walks through the exact language of the exemption under 29 CFR 1910.147, what OSHA means by exclusive control of the plug, the conditions that quietly void the exception, how it differs from the minor servicing exception, and how to write the practice into a program so it holds up in an audit.

What the Standard Actually Says

The exemption sits in the scope section of the standard, not in the procedures. 1910.147(a)(2)(iii)(A) states that this standard does not apply to work on cord-and-plug connected electric equipment for which exposure to the hazards of unexpected energization or start up of the equipment is controlled by the unplugging of the equipment from the energy source, and by the plug being under the exclusive control of the employee performing the servicing or maintenance.

Read that as a two-part test, because that is how OSHA reads it. First, unplugging the equipment has to be what controls the hazard. Second, the plug has to stay under the exclusive control of the person doing the work. Both parts must hold for the whole duration of the task. The moment either one fails, the equipment is back inside the scope of 1910.147 and needs a locked energy isolating device like anything else on the floor.

Notice what the exemption does not say. It does not say cord-and-plug equipment is exempt from lockout. It says the standard does not apply when the hazard is controlled a specific way. That distinction is the whole ballgame. The plug is doing the job a lock would do, so the plug has to be controlled the way a lock would be controlled.

Exclusive Control of the Plug, Defined

OSHA has interpreted exclusive control in enforcement guidance and letters of interpretation. The core idea is that the authorized employee has the authority to, and is continuously in a position to, prevent other people from re-energizing the equipment during the work. That is the same protective goal a personal lock delivers. The plug becomes the control point, and the worker has to own it the way they would own the key to their lock.

In practical terms, OSHA has recognized the plug as being under exclusive control in three situations:

• The plug is physically in the possession of the employee, for example held in hand or kept in a pocket.
• The plug is within arm's reach and in the line of sight of the employee for the duration of the task, so no one can reinsert it without the worker seeing and stopping it.
• The employee has attached a lockout or tagout device to the plug in compliance with 1910.147, such as a plug lockout box, which physically prevents reinsertion.

The failure mode is the plug that is out of possession, out of reach, and out of sight. A cord snaking behind a machine to a receptacle two aisles over is not under exclusive control, no matter how confident the tech is that nobody will touch it. If you cannot see it and cannot reach it, someone else can plug it back in, and the exemption is gone. For equipment where the receptacle is remote or shared, the cheap and defensible answer is a plug lockout device, which brings the plug back under control and, not coincidentally, converts the practice into actual lockout.

Where the Exemption Quietly Collapses

Most cord-and-plug findings do not come from a worker misjudging line of sight. They come from a piece of equipment that never qualified for the exemption in the first place. Four conditions take a machine out of the exception even when the plug is perfectly controlled.

A second energy source. The exemption covers the electrical hazard controlled by the plug. If the same equipment also has a pneumatic supply, a hydraulic accumulator, or a separate control power feed, pulling the plug does nothing about that source. Multi-source equipment needs a full energy control procedure that isolates every source, not just the one on the cord.

Stored energy. The exemption addresses unexpected energization or start up. It says nothing about energy already stored inside the equipment. A charged capacitor in a drive or power supply, a compressed spring, trapped hydraulic or pneumatic pressure, or a raised component held by gravity all remain hazardous after the plug is out. That stored energy has to be relieved, discharged, blocked, or restrained. If it cannot be, the equipment is not controlled by unplugging alone. Our breakdown of stored energy isolation under 1910.147 covers how the standard treats these residual sources.

Hardwired equipment. The exception is written for cord-and-plug connected equipment. Hardwired machines, or equipment on a twist-lock or pin-and-sleeve connector that functions as a fixed connection, are not plug-controlled in the way the exemption contemplates and need a locked disconnect. If the connection point is a disconnect switch rather than a receptacle, you are in electrical disconnect lockout territory, not the cord-and-plug exception.

Servicing that is not minor. The cord-and-plug exception and the minor servicing exception are two different things that often get blended. Even where a plug is controlled, if the work exposes an employee to hazards a simple unplugging does not address, the broader requirements of the standard apply.

Cord-and-Plug vs the Minor Servicing Exception

These two exceptions get confused constantly, and mixing them up creates gaps. They are separate provisions with separate conditions.

The cord-and-plug exception at 1910.147(a)(2)(iii)(A) is about how the hazard is controlled: by unplugging, with the plug held under exclusive control. The minor servicing exception at 1910.147(a)(2)(ii) is about the nature of the task: minor tool changes, adjustments, and similar minor servicing that takes place during normal production operations, provided alternative effective protection is in place. A task can qualify under one, both, or neither. The mistake is assuming that because a machine has a plug, any work on it is automatically exempt. It is not. Each exception has to be evaluated on its own terms, and if neither cleanly applies, the default is a written, machine-specific lockout procedure.

Documenting It So It Survives an Audit

The cord-and-plug exception is a scope determination, and inspectors treat undocumented scope determinations with suspicion. When we run a LOTO gap analysis, cord-and-plug equipment is a standing item, because the equipment that relies on the exception is rarely written down anywhere. A defensible program does four things.

1. Identifies the equipment. The program names which specific equipment is serviced under the cord-and-plug exception rather than under lockout, so the boundary is deliberate, not accidental.
2. States the control method. For each item, the program specifies how exclusive control of the plug is maintained: possession, line of sight and reach, or a plug lockout device.
3. Confirms single-source, no stored energy. The determination records that the equipment has one energy source controlled by the plug and no stored energy that survives unplugging. Anything failing this test comes off the exemption list.
4. Trains affected employees. Everyone who works near the equipment understands that a plug pulled and controlled is intentional isolation, and that reinserting it is prohibited, the same way they would treat a personal lock.

This is the same discipline the standard expects everywhere else. Every exception is a decision, and every decision has to be documented, justified, and trainable. A program that can point to the equipment, the control method, and the training for each cord-and-plug item is defensible. A program that waves at the exception without writing anything down is a citation waiting for an inspection date.

Frequently Asked Questions

Does OSHA 1910.147 apply to cord-and-plug connected equipment?

Not when one condition is met. Under 1910.147(a)(2)(iii)(A), the standard does not apply to cord-and-plug connected equipment if the hazard of unexpected energization is controlled by unplugging it and the plug stays under the exclusive control of the employee doing the work. Break either part of that test and full lockout applies.

What does exclusive control of the plug mean under OSHA?

OSHA interprets exclusive control to mean the authorized employee can prevent anyone else from re-energizing the equipment. In practice the plug is under exclusive control if it is physically in the employee's possession, or within arm's reach and in the employee's line of sight, or if the employee has attached a lockout or tagout device to the plug per 1910.147.

When does the cord-and-plug lockout exemption not apply?

The exemption fails when the plug is out of sight or out of reach, when a second energy source is present such as stored capacitive energy or a separate pneumatic line, when the equipment is hardwired rather than plugged, or when unplugging alone does not remove all hazardous energy. In those cases 1910.147 lockout is required.

Do capacitors or stored energy affect the cord-and-plug exemption?

Yes. The exemption only covers the hazard of unexpected energization or start up controlled by the plug. If the equipment holds stored energy after unplugging, such as a charged capacitor, a spring, hydraulic pressure, or a raised component, that energy must still be relieved or restrained. Stored energy is not addressed by pulling the plug, so it falls outside the exception.

Is unplugging equipment enough to satisfy OSHA lockout rules?

Unplugging is enough only for single-source cord-and-plug equipment where the plug stays under the employee's exclusive control and no stored or secondary energy remains. For any equipment with a second energy source, a plug the worker cannot see or reach, or a hardwired connection, unplugging is not enough and a locked energy isolating device is required.

How should a LOTO program document cord-and-plug servicing?

The energy control program should name which equipment qualifies for the cord-and-plug exception, state the exclusive control method used (possession, line of sight and reach, or a plug lockout device), confirm there is no secondary or stored energy, and train affected employees on the limits of the exception. Anything that does not clearly qualify defaults to a written machine-specific lockout procedure.