Another crazy question that I was asked a few weeks back by a friend and up-and-coming safety pro. Again, the side bar group discussions ALL said NO, the authorized employee doing the LOTO must be the one to verify ZES of the LOTO, not the “affected employee” who has nothing to do with the LO or the maintenance servicing task(s). Here is what Gemini Plus said, which again I thought was a very good response…
According to OSHA 1910.147(d)(6), the answer depends heavily on the worker’s designation as an Authorized Employee.
The standard requires that the “Authorized Employee” perform the verification of de-energization. Here is how that applies to your specific scenario:
- The Requirement for “Authorized” Status
Only an Authorized Employee (the person who locks out the machinery to perform service or maintenance) is permitted to verify that the equipment is at a zero energy state.
An Affected Employee (someone whose job requires them to operate the machine or work in the area) is not permitted to perform the verification.
The verification step usually involves attempting to cycle the start button or using testing equipment (like a voltmeter) to ensure the energy is dissipated.
- Individual vs. Group Lockout
The rules shift slightly depending on whether you are looking at an individual or a team:
Individual Lockout: If a worker is going to perform maintenance, they must apply their own lock and personally verify that the energy is isolated. They cannot rely on a coworker’s word or a previous shift’s verification.
Group Lockout (1910.147(f)(3)): In larger operations where multiple people are working on the same system, a “primary authorized employee” may coordinate the lockout. However, the standard still mandates that each authorized employee must be able to verify the effectiveness of the lockout, or observe the verification, to ensure their own personal protection.
- The Verification Process
OSHA defines the verification step as the final check before work begins. It typically follows this sequence:
Preparation: Identifying energy types (electrical, pneumatic, kinetic, etc.).
Shutdown: Turning off the equipment.
Isolation: Operating the disconnects/valves.
Application: Placing locks and tags.
Stored Energy: Releasing or restraining any residual energy (bleeding lines, grounding electrical charges).
Verification: Attempting to restart or testing to ensure zero energy.
Summary for Your Scenario
If the worker is not part of the lockout process and is not an “Authorized Employee” for that specific task, they cannot be the one to verify the zero energy state for others.
The core philosophy of 1910.147 is personal accountability: the person putting their hands in the “pinch point” must be the one to confirm the machine won’t move. Relying on a third party who is not involved