During pre-maintenance electrical safety checks, what is the purpose of lockout/tagout power sources?

• A. To identify the task
• B. To verify de-energization
• C. To prevent re-energization of power sources during maintenance
• D. To wear PPE

Answer: (C)

Lockout/tagout power sources are used to prevent re-energization of equipment during maintenance. By isolating the electrical supply and applying a lock, the energy source cannot be re-energized while work is being done. A tag provides a clear warning and identifies who placed the lock, ensuring others do not restore power. Verifying that the system is de-energized is an important step, but the main purpose of lockout/tagout is to keep that energy from coming back on during maintenance. The other options describe related activities (planning the task or using PPE) but do not accomplish the protection goal of preventing re-energization.