In a LOTO program, what is the purpose of tagging energy sources?

• A. To identify the repair person.
• B. To log maintenance hours.
• C. To ensure the equipment is re-energized after maintenance.
• D. To indicate that the energy source is locked or secured and must not be energized.

Answer: (D)

Tagging energy sources in a LOTO program provides a visible warning that the energy is isolated and must not be energized. The tag accompanies the lockout to convey who placed the control, when it was applied, and why maintenance is happening, creating accountability and preventing accidental re-energization. The physical lock actually holds the energy source in the safe, isolated position, while the tag communicates the status and the prohibition to others. The other ideas don’t reflect the purpose of isolation and warning: identifying the repair person, logging maintenance hours, or ensuring re-energization after work would not help prevent unexpected startup.