What is the purpose of a lockout/tagout (LOTO) program?

• A. To lock doors when leaving the facility.
• B. To prevent unexpected energization of equipment during maintenance; ensures worker safety.
• C. To seal chemical containers after use.
• D. To authorize overtime shifts.

Answer: (B)

The main idea behind a lockout/tagout program is to keep workers safe by preventing the equipment they are servicing from starting up or releasing stored energy. Before maintenance, all energy sources—electrical, hydraulic, pneumatic, mechanical, thermal, gravitational, and others—are identified and isolated. Locks and, when needed, warning tags are applied to control devices so that the equipment cannot be energized accidentally while work is being done. Only trained personnel can remove those devices after verifying that the area is safe and there is zero energy present. This approach directly reduces the risk of sudden startup, shock, burns, or other injuries during maintenance.

Other options aren’t about controlling energy or protecting workers during servicing. Locking doors is a general security measure, sealing chemical containers relates to containment or labeling rather than isolating energy, and authorizing overtime shifts is a scheduling matter, not a safety control.