Verifying De-energization Toolbox Talk

Equipment is not safe just because it is shut off, locked, or tagged. Power, pressure, stored movement, heat, or other energy can still be present after lock out tag out is applied. If the crew does not verify de-energization, a worker may reach into equipment that can still shock, move, crush, burn, or release pressure.

This talk focuses on confirming zero energy before service, repair, cleaning, adjustment, or jam clearing starts. The crew needs to know how to test, check, bleed, block, discharge, and try-start equipment so no one trusts a lockout until it has been verified.

Why This Matters

• Verification is the step that proves the equipment is actually safe to work on.
• A locked switch or valve may not control every energy source connected to the equipment.
• Stored energy can remain in capacitors, hydraulic lines, air tanks, springs, raised parts, or hot surfaces.
• Testing before work starts helps catch wrong breakers, mislabeled valves, failed disconnects, and hidden feeds.
• Zero energy must be confirmed before hands, tools, or body parts enter the danger area.

Common Hazards

• Assuming equipment is de-energized because the motor, pump, fan, or conveyor is not running.
• Failing to test electrical circuits with the proper meter or testing device.
• Skipping the try-start step after locks and tags are applied.
• Not bleeding down hydraulic or pneumatic pressure before opening lines or removing parts.
• Leaving raised buckets, blades, platforms, forks, or suspended parts unsupported.
• Ignoring stored energy in springs, flywheels, belts, chains, cylinders, capacitors, or batteries.
• Not checking for heat, steam, gas, fuel, or chemical energy before opening equipment or piping.
• A backup generator, temporary power feed, battery system, or automatic control re-energizing equipment after the main source is locked out.

Safety Checklist

Before Work Begins

• Review the lock out tag out procedure and identify how de-energization will be verified.
• Confirm all energy sources have been isolated, locked, and tagged.
• Use the correct test equipment for electrical circuits and confirm the tester works before and after use.
• Try the start button, control switch, foot pedal, remote, or operating controls after lockout is applied.
• Bleed hydraulic and pneumatic lines, tanks, hoses, and cylinders to zero pressure where required.
• Lower, block, pin, crib, or support raised equipment and suspended parts.
• Discharge capacitors, release spring tension, stop rotating parts, and secure belts, chains, and flywheels.
• Check for remaining heat, steam, gas, fuel, chemicals, or pressure before opening covers, fittings, or lines.

During Work

• Keep locks and tags in place after verification is complete.
• Do not begin work if any test shows voltage, pressure, movement, heat, or other energy remains.
• Watch for pressure or energy building back up during the task.
• Recheck de-energization if the job scope changes or another energy source is found.
• Keep blocks, pins, cribbing, and supports in place until the equipment is ready to be returned to service.
• Do not rely only on indicator lights, gauges, screens, or control panels to prove zero energy.
• Communicate test results to the crew before anyone starts work inside the hazard area.

Crew Talking Points

• How will we verify zero energy on the equipment we are working on today?
• What tests, gauges, meters, blocks, or try-start steps are needed?
• Are there any stored energy sources that could remain after lockout?
• Who is responsible for confirming de-energization before work begins?
• What could re-energize this equipment by mistake?
• Does anyone have a question or concern about how we will verify de-energization before starting work?

Stop Work If

• Zero energy has not been verified.
• The equipment starts, moves, cycles, sparks, leaks, heats up, or builds pressure during testing.
• A meter, gauge, tester, or other verification tool is missing, damaged, or not working correctly.
• Stored energy cannot be released, blocked, discharged, or controlled.
• The lockout procedure does not explain how to verify de-energization for the equipment.
• Workers are unsure whether all energy sources have been tested and confirmed safe.

Final Reminder

Never trust shutdown alone. Lock it out, control stored energy, test it, try it, and prove zero energy before anyone starts the work.