LOTO Verification Checklist

FAILURE CONDITION: Skipping Step 5 (Verification of De-Energization) results in catastrophic system activation.
HISTORICAL NOTE: The 1998 West Virginia power plant incident claimed 3 lives due to premature removal of LOTO devices.
YOUR SIGNATURE BELOW BINDS YOU TO THIS PROTOCOL.

PHASE 1: PREPARATION FOR LOCKOUT // §1910.147(c)(1)

[01] Notify all affected employees that servicing is scheduled. Document notification time. (c)(1)(i)
[02] Identify all energy isolation devices required for the specific machine/system. (c)(1)(ii)
[03] Shut down the machine using normal stopping procedures (stop button, lever, etc.). (c)(1)(iii)

PHASE 2: ENERGY ISOLATION // §1910.147(c)(2)

[04] Physically isolate each energy source. For electrical: open disconnect switch. For pneumatic: close valve AND cap port. (c)(2)(i)
[05] Apply individual LOTO device to EACH isolation point. Group locks require group lockbox with supervisor key. (c)(2)(ii)
[06] Tag each device with: Employee name, Department, Date, Reason for lockout. (c)(2)(iii)

PHASE 3: STORED ENERGY DISSIPATION // §1910.147(c)(3)

[07] Block, bleed, or otherwise neutralize ALL stored energy: hydraulic pressure, spring tension, gravity loads, thermal gradients. (c)(3)(i)
[08] Verify dissipation with appropriate instrument: manometer for pressure, pyrometer for thermal, laser distance for mechanical displacement. (c)(3)(ii)
[09] Record all readings in the Energy Dissipation Log (see appendix JSON). (c)(3)(iii)

PHASE 4: VERIFICATION OF DE-ENERGIZATION // §1910.147(c)(4)

// CRITICAL STEP — CHANDRA HARRIS VALIDATION
def verify_zero_energy_state(isolation_devices):
    """
    Returns True only if ALL energy sources are confirmed zero.
    This is the moment before we touch the canvas.
    """
    for device in isolation_devices:
        if device.get('potential_drift') != 0.0:
            raise RuntimeError(f"{device['id']} failed zero-energy check")
        if device.get('tag_status') != 'APPLIED':
            raise RuntimeError(f"{device['id']} missing LOTO tag")
    return True

# OUTPUT: System ready for safe intervention.

[10] Attempt to start the machine using normal controls. Observe NO movement, NO sound, NO voltage. (c)(4)(i)
[11] Reset all controls to OFF/NEUTRAL position after verification attempt. (c)(4)(ii)
[12] Perform final multimeter test across all terminals. Reading must be 0.00V ± 0.01V. (c)(4)(iii)

// MAINTENANCE AUTHORIZATION

I certify that the above protocol has been executed in full compliance with 29 CFR 1910.147.

TECHNICIAN NAME: _________________________

SIGNATURE: _________________________

TIMESTAMP: _______/______/______

// This signature is legally binding. Violation carries criminal liability.