After isolating equipment from power sources, what is still necessary?

Controlling stored energy in the system is crucial even after isolating equipment from power sources. This step ensures that any residual energy forms—such as hydraulic pressure, pneumatic pressure, or mechanical tension—are safely managed to prevent accidental release during maintenance or service tasks. Failure to address stored energy could lead to unexpected equipment movement or release of hazardous energy, posing significant risks to workers' safety.

While removing tools, informing personnel, and turning off lights are important safety practices, they do not specifically address the inherent risks associated with residual energy. Managing stored energy is a key component of a comprehensive lockout/tagout program, which not only involves isolating power but also ensuring that any potential energy hazards are fully controlled before work begins. This mitigates the risk of accidents and injuries in the workplace.