In the EPI Facilities Operations Manager body of knowledge, theLock-Out/Tag-Out (LOTO)procedure is a mandatory safety control to ensure that electrical or mechanical equipment cannot be energized while work is being performed. A core principle emphasized in EPI safety training is:
“The person who applies the lock must be the same person who removes it.”
This aligns with international best practices for occupational health and safety, where LOTO ensures that the individual performing maintenance or repair has full control of the energy isolation device.
Why this is required:
Personal Safety ResponsibilityThe lock identifies the technician directly working on the equipment. Only they can confirm whether work is complete and the area is safe for re-energizing.
Risk PreventionIf someone else removes the lock (another operator, safety manager, or facilities manager), they may incorrectly assume that the equipment is ready to be restored, which can lead to severe injury or fatality.
Compliance With EPI Safety GuidelinesEPI emphasizes the principle of“single-person control”over hazardous energy. No supervisor or colleague may remove another technician’s lock unless a formal, documented emergency override procedure is followed — which isnot considered standard practice.
Clear Accountability ChainLOTO prevents ambiguity or miscommunication. The technician who placed the lock is the only one with full knowledge of the work status and hazards involved.
Why other options are incorrect:
A, B, and Cviolate the fundamental LOTO rule because they involve someone other than the applying operator removing the lock.
Oversight personnel (safety manager, facilities manager) monitor and audit the process, but they should not remove another person’s lock except under rare, emergency, escalation-approved situations.
EPI DCFOM-Aligned Reference Concepts (Paraphrased, Not Verbatim)
LOTO must ensure the isolation device is locked and tagged by the person performing the work.
Only the same individual may remove their own lock.
Removal by another party is only permitted under controlled, documented emergency protocols.
The process prevents accidental energization and protects worker safety.
