Which system is used to prevent energizing of equipment by isolating and tagging the power source?

Which system is used to prevent energizing of equipment by isolating and tagging the power source?

• A. Isolation tagging
• B. Barrier control
• C. Zone control
• D. Lockout/tagout

Answer: (D)

The idea being tested is how to prevent a piece of equipment from energizing while it’s being worked on by cutting off all energy sources and clearly signaling that it’s de-energized. Lockout/tagout is the system that does exactly this: a lock is applied to the energy-control device (like a switch or breaker) to physically keep it from being turned back on, and a tag is placed to warn that the equipment must not be energized. This combination provides both a physical barrier and a clear warning, so no one restarts the equipment until the lock is removed by the authorized person who applied it. During the procedure, you identify all energy sources, shut the equipment down, isolate those sources with appropriate devices, apply locks and tags, and verify that energy has actually been removed before beginning work. Only the person who applied the lock and tag—or another authorized worker—can remove them, which keeps workers safe from unexpected energization. The other terms aren’t standard safety systems for preventing energization. Barrier control and zone control relate to limiting access or defining areas, not to isolating and locking out energy sources. Isolation tagging isn’t a formal, widely used safety term for this practice.

The idea being tested is how to prevent a piece of equipment from energizing while it’s being worked on by cutting off all energy sources and clearly signaling that it’s de-energized. Lockout/tagout is the system that does exactly this: a lock is applied to the energy-control device (like a switch or breaker) to physically keep it from being turned back on, and a tag is placed to warn that the equipment must not be energized. This combination provides both a physical barrier and a clear warning, so no one restarts the equipment until the lock is removed by the authorized person who applied it.

During the procedure, you identify all energy sources, shut the equipment down, isolate those sources with appropriate devices, apply locks and tags, and verify that energy has actually been removed before beginning work. Only the person who applied the lock and tag—or another authorized worker—can remove them, which keeps workers safe from unexpected energization.

The other terms aren’t standard safety systems for preventing energization. Barrier control and zone control relate to limiting access or defining areas, not to isolating and locking out energy sources. Isolation tagging isn’t a formal, widely used safety term for this practice.