Outline the steps of a lockout/tagout (LOTO) procedure during maintenance and why verification is essential.

• A. Identify equipment, isolate sources, apply LOTO devices, verify de-energization with test instrumentation, release only after procedures completed and safety verified.
• B. Lockout/tagout steps are not necessary if procedures are understood informally.
• C. Verify de-energization using test instrumentation but do not apply LOTO devices.
• D. Apply LOTO devices and tags, but skip verification.

Answer: (A)

Lockout/tagout procedures are about preventing hazardous energy from releasing while maintenance is performed. The steps involve identifying all energy sources that could energize the equipment, isolating those sources so the equipment cannot be powered, applying LOTO devices to physically prevent re-energization (and using tags when needed to warn others), and then verifying that the system is truly de-energized before any work begins. Verification matters because it confirms there is no live energy left in electrical, hydraulic, pneumatic, mechanical, or stored forms, including residual or released energy, so workers won’t face unexpected energization. Using test instruments to check for zero energy allows a worker to be certain the isolation is effective and that it’s safe to proceed. The work is completed only after these verifications, and the equipment is ready for safe restart through proper removal of the devices by authorized personnel. Skipping formal LOTO steps or relying on informal procedures, as well as verifying without applying LOTO devices or applying devices but skipping verification, fails to provide the physical and verifiable protection needed to prevent sudden energy release or re-energization.