What must be done to deenergized equipment or circuits according to 1926.417(b)?

To ensure that deenergized equipment or circuits are properly managed, they must be rendered inoperative. This is a critical safety measure that prevents accidental re-energization or operation, which could pose significant risks to workers. According to the regulations set forth in 1926.417(b), this involves using lockout/tagout procedures or similar methods to ensure that the equipment cannot be accidentally energized while maintenance or inspections are being conducted. This approach emphasizes the importance of taking deliberate steps to safeguard workers by eliminating any possibility of unexpected equipment operation, thereby enhancing overall safety in the workplace.

The other options do not adequately address the required safety protocol. Merely keeping equipment in a control room or storing it safely does not prevent the risk of accidental energization. Similarly, though training and clearly marking equipment is valuable for awareness, it does not provide the necessary physical actions needed to ensure that the equipment remains inoperative.