Which statement about tag-out practices is correct?

• A. Tag-out indicates a subsystem is de-energized or out of service.
• B. Tag-out marks high-priority tasks.
• C. Tag-out calibrates a subsystem.
• D. Tag-out records inspection results.

Answer: (A)

Tag-out is a warning used in energy isolation to indicate a subsystem has been de-energized or taken out of service for maintenance. It is attached to the energy‑isolating device to communicate that the equipment should not be reenergized until the tag is removed by an authorized person, often with details like who applied it and the reason. The tag itself provides a safety warning but does not physically block energy—that’s done by lockout devices when needed. This is why tag-out is about signaling de-energization, not about prioritizing tasks, calibrating equipment, or recording inspection results.