What is Lockout Tagout?

Understanding Lockout Tagout

Lockout Tagout is a controlled method for protecting people. It covers people who service, repair, clean, adjust, or inspect equipment. The method combines energy isolation with a physical lock and warning tag. It stops an energy-isolating device from being switched back on during work. The process covers more than electrical power. It also covers mechanical movement, pressurized air, hydraulic pressure, steam, heat, gravity, and stored electrical charge.

Related glossary terms: Electrical Safety, Main Disconnect, Emergency Shutoff.

A normal control switch doesn't always remove the hazard. A motor may restart from remote control. A capacitor may retain charge. A raised component may fall after power removal. Lockout Tagout requires the worker to identify every energy source. The worker must shut down equipment and isolate each source. The worker must release or restrain stored energy. The worker then verifies that equipment can't operate before touching the hazard area.

How Lockout Tagout Works, Is Measured, or Is Used?

A written procedure usually begins by identifying the equipment and its energy sources. It identifies the correct disconnect or isolation point. An authorized worker informs affected workers and stops the equipment. The worker opens the isolation devices and applies a personal lock and tag. Stored energy is discharged, blocked, grounded, or otherwise controlled. The worker then tests the equipment controls. The worker uses an appropriate voltage tester when electrical energy is involved.

Verification is the key quality check. The worker attempts a normal start. The worker confirms that controls don't operate the equipment. The worker checks for no voltage or other hazardous energy. The test instrument must suit the system. The worker checks it before and after electrical testing. Work can begin only after the worker confirms zero energy. An equally controlled condition also meets this requirement. Each worker removes that worker’s own lock after the job. A documented site procedure may handle an approved exception.

Group work needs extra controls. Several people may rely on the same isolation. A group lockbox, personal locks, and named coordinator can connect workers to the isolation plan. Shift changes require a controlled transfer. This keeps protection from lapsing. A site should also inspect its procedures at least annually. This review must follow the applicable OSHA rule. The site should retrain workers when duties, equipment, or procedures change.

Why Lockout Tagout Matters?

Unexpected energization can cause electric shock, arc flash, crushing, burns, cuts, or falls. A warning sign may tell people not to operate equipment. A physical lockout device creates a stronger barrier against accidental operation. The procedure also makes the team identify hidden sources. A quick power-down may miss capacitors, backup generators, and connected circuits.

Good Lockout Tagout practice improves repair decisions. It creates a repeatable path from shutdown to verified safe work. It reduces reliance on memory and informal instructions. This matters during urgent repairs or work involving several trades. The written procedure should match the actual equipment. It should show isolation points clearly. It should identify the method for releasing stored energy.

When Lockout Tagout Matters Most?

Lockout Tagout matters when a worker could face hazardous energy during a task. Common examples include opening an electrical panel or replacing a motor. Other examples include clearing a jam or servicing an air handler. They also include repairing a pump or working near moving belts. It's especially important when equipment has multiple feeds or automatic controls. It also matters with remote starts, battery backup, or a generator connection.

Before work starts, ask if the task involves more than normal operation. Ask if a worker must remove a guard or enter a danger zone. Also ask if a body part must go near an energy source. Check the equipment-specific procedure. Confirm every disconnect. Inspect the lock and tag. Verify the test result. In Miami facilities, heat, flooding, and storm damage can add energy sources. Temporary power arrangements can also add energy sources. A standard shutdown may not address these sources.