What is the meaning of 'tag-out' in inspection practice?

• A. The process of placing tags to indicate a subsystem is de-energized or out of service.
• B. A method of labeling tools for calibration.
• C. A procedure to log equipment usage hours.
• D. A process to modify a subsystem's operating parameters.

Answer: (A)

Tag-out means placing a visible tag on a subsystem to show that it is de-energized or out of service. In inspection practice, this signals that the equipment should not be operated or re-energized until authorized personnel verify it is safe to proceed. The tag communicates essential information—who applied it, the reason, and the date or duration—so others understand why the equipment is isolated and what must be done before it can be used again. This is usually part of a broader lockout/tagout process that ensures safe isolation of hazardous energy during maintenance or inspections. The other options describe labeling for calibration, logging usage hours, or changing operating parameters, which do not convey an energy isolation status.