In lockout-tagout procedures, which item is used to secure energy isolation?

• A. A tag that indicates equipment is hazardous.
• B. A maintenance log.
• C. A lockout device.
• D. A safety manual.

Answer: (C)

Lockout-tagout relies on physically securing the energy isolation point so equipment cannot be started accidentally during maintenance. The item that does this is the lockout device. It is attached to the energy source—like a switch, valve, or power disconnect—and locked in the safe position with a unique key kept by the authorized worker. This physical restraint is what actually prevents energy from being released or equipment from energizing. A tag accompanies the lockout to provide information and warnings, but it does not by itself prevent energization. The other items listed—like a maintenance log or a safety manual—support the program but do not secure the energy isolation.