__________ may remove a lockout on the power source of a piece of mechanical equipment.

The correct answer is that only the person who installed the lockout may remove it. This procedure is critical for maintaining safety during maintenance or repair work on machinery. When someone installs a lockout on a power source, they are indicating that they are actively working on that piece of equipment and that it should not be operated until they have completed their work and removed the lock.

This policy is in place to ensure accountability and prevent unintentional start-ups that could lead to accidents. Allowing only the individual who applied the lockout to remove it ensures that there is a clear line of responsibility. This practice reinforces proper hazardous energy control and emphasizes individual ownership of safety protocols. By restricting the removal of the lockout to the installer, it mitigates risks associated with multiple individuals having the authority to clear the lock, which could lead to confusion or dangerous situations.