What is the correct sequence for maintenance energy control on a machine?

• A. Follow lockout/tagout, release stored energy, and verify zero energy before servicing.
• B. Service first, then lockout.
• C. Rely on standard operation to avoid energy release.
• D. Ignore energy release and proceed with maintenance.

Answer: (C)

Controlling energy before maintenance means creating a safe, zero-energy state so workers cannot be injured by startup or released energy while the work is being done. The correct approach is to first apply lockout or tagout devices to the energy-isolating points, then release any stored or residual energy, and finally verify that all energy paths are at zero energy before work begins. This sequence prevents reaccumulation of energy and ensures the machine cannot re-energize during maintenance. Skipping isolation, relying on assumed safe conditions, or ignoring stored energy would leave workers exposed to sudden startup or stored-energy hazards.