Lockout / Tagout - Ohio Bureau of Workers' Compensation

• Verification is provided by a system which actively confirms zero-energy state to the
drives before the verification light comes on.
• When an individual initiates the lockout sequence by opening the system switch and
placing a lock on it, then the verification light will come on, if the machine is at a
zero-energy state.
• If the light goes out due to bulb failure while an authorized employee is performing
servicing and maintenance on the machine, the system remains safe because the
switch is open and locked out.
• The system is designed such that failure of any component in the system will not
result in the light coming on when the machine is in an unsafe mode.
• The system is contained in sealed, protected box.
• The equipment used is certified by a nationally recognized testing laboratory.
• An independent laboratory did a system risk analysis and determined the proposed
system presented the lowest risk to the operator.
Based on the information enclosed in your letter, your "safety disconnect system" has
been evaluated as an inherently fail-safe system which performs the same function as
an energy isolating device identified in paragraph 1910.147(b). When used as an
energy isolating device, this "safety system" must be addressed in the energy control
program required in §1910.147(c)(1).
Of particular concern is other hazardous energy sources which are not isolated by the
safety disconnect system. For example, the machine glue heaters are directly
connected (on the supply side of the safety disconnect system) to the hazardous
electrical energy source. Potential employee exposure to glue heater hazardous
electrical and thermal energy during servicing and maintenance of machines must be
addressed in the energy control program.
We appreciate your interest in employee safety and health. If we can be of further
assistance, please contact the Office of Safety Compliance Assistance, Mr. Ronald J.
Davies, telephone (202) 219-8031, extension 110.
Sincerely,
John B. Miles, Jr., Director
Directorate of Compliance Programs
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