Lockout Devices Toolbox Talk

Lockout devices are what physically keep equipment, panels, valves, switches, and other energy sources from being turned back on during service or repair. A tag warns people, but the lockout device prevents re-energizing. If the wrong device is used, installed poorly, or removed too soon, the worker doing the job can be seriously hurt.

This talk focuses on choosing, installing, and checking lockout devices before work begins. The crew needs to understand which device fits the energy source, who controls the key, and why a lockout device must never be bypassed, shared, or removed without following the proper procedure.

Why This Matters

• Lockout devices prevent equipment from starting while workers are exposed to moving parts, pressure, heat, electricity, or stored energy.
• A tag alone does not stop someone from flipping a switch, opening a valve, or plugging in equipment.
• The wrong device can slip off, break, or fail to hold the energy source in the safe position.
• Each authorized worker needs control of their own lock during the work.
• Proper lockout devices help prevent confusion when multiple trades are working near the same equipment.

Common Hazards

• Using a tag without a lock or physical lockout device when one is required.
• Installing a lock on the wrong breaker, disconnect, valve, plug, or control point.
• Using a lockout device that does not fully secure the energy-isolating point.
• Leaving valves, breakers, or plugs exposed where someone can re-energize them.
• Sharing keys or placing one worker’s lock for another worker.
• Using damaged locks, worn hasps, cracked valve covers, broken plug boxes, or bent breaker lockouts.
• Failing to use a group lock box when multiple workers are protected by the same lockout.
• Using tape, wire, zip ties, or warning signs as a substitute for an approved lockout device.

Safety Checklist

Before Work Begins

• Identify the exact energy-isolating device that needs to be locked out.
• Select a lockout device that fits the breaker, disconnect, valve, plug, switch, or control point.
• Inspect locks, tags, hasps, chains, valve covers, plug lockouts, and breaker lockouts for damage.
• Make sure each authorized worker has their own lock, tag, and key.
• Confirm the lockout device holds the energy source in the off, closed, blocked, or safe position.
• Use a group lock box or multi-lock hasp when more than one worker is involved.
• Write clear information on the tag, including name, date, reason for lockout, and contact information.
• Notify affected workers before installing lockout devices.

During Work

• Keep lockout devices in place until the work is complete and the equipment is safe to re-energize.
• Do not remove, bypass, force, or tamper with another worker’s lockout device.
• Keep control of your own key at all times.
• Check that the lockout device remains tight, visible, and properly positioned during the task.
• Verify that the equipment cannot start, move, pressurize, heat up, or energize after lockout is installed.
• Stop work if a lockout device becomes loose, damaged, missing, or unclear.
• When work is complete, remove only your own lock unless the approved removal procedure is followed.

Crew Talking Points

• What lockout devices are needed for the equipment we are working on today?
• Are we locking out a breaker, valve, disconnect, plug, battery, switch, or another energy source?
• Does the device fully prevent the energy source from being turned back on?
• Who has locks on this equipment, and who controls each key?
• Do we need a hasp or group lock box for this task?
• Does anyone see a missing, damaged, loose, or unclear lockout device that needs to be fixed before work continues?

Stop Work If

• The correct lockout device is not available.
• A lockout device does not fit securely or can be bypassed.
• A tag is being used without a lock where physical lockout is required.
• Someone asks you to remove, ignore, or work around another worker’s lock.
• The lockout point is not clearly identified or does not match the procedure.
• The equipment can still start, move, pressurize, heat up, or energize after lockout.

Final Reminder

A lockout device is there to protect the person doing the work. Use the right device, install it correctly, keep your key, and never remove anyone else’s lock.