Lockout/Tagout procedures are primarily used to prevent...

• A. Data loss
• B. Fire
• C. Unexpected energization during maintenance
• D. Chemical spills

Answer: (C)

Lockout/tagout is about stopping machines from starting up or releasing stored energy while they’re being worked on. When a worker isolates a piece of equipment and applies a lock (and a warning tag), all energy sources—electrical, mechanical, hydraulic, pneumatic, thermal, gravity, etc.—are kept in a non-operable state. The lock physically prevents re-energizing, and the tag warns others not to operate the equipment and to identify who placed the lock. Only after the lock is removed and the area is confirmed safe can the machine be started again. This focus on preventing unexpected energization during maintenance is what makes it the primary purpose of lockout/tagout.

(Other hazards like data loss, fire, or chemical spills can occur in related scenarios, but they are not the main focus of LOTO.)