Lockout/tagout (LOTO) primarily ensures safety by preventing what during maintenance?

• A. Increasing system uptime
• B. Locking inventory items
• C. De-energizing or isolating equipment before maintenance.
• D. Tagging employees for shift changes

Answer: (C)

Lockout/tagout centers on controlling hazardous energy to prevent the machine from energizing or releasing stored energy while someone is working on it. Before maintenance begins, all energy sources that could power the equipment—electrical, hydraulic, pneumatic, mechanical, and even thermal sources—are shut off and isolated. A lock or other energy-control device is placed on the energy source, and a warning tag is added to ensure the equipment cannot be re-energized until the maintenance work is complete and the area is safe. This directly protects workers from injuries that could result from unexpected startup, energization, or the release of stored energy.

Other options miss the safety focus. LOTO isn’t about improving uptime, locking inventory, or administrative shift changes; it’s specifically about preventing energy from reaching the equipment during work.