According to Subpart K, when equipment or circuits are deenergized, they must be rendered inoperative and have tags attached at all points where such equipment or circuits can be energized.

According to Subpart K, when equipment or circuits are deenergized, they must be rendered inoperative and have tags attached at all points where such equipment or circuits can be energized.

• A. Rendered inoperative
• B. Insulated
• C. Grounded
• D. Disconnected

Answer: (A)

This item tests how Subpart K handles controlling hazardous energy when work is done on equipment. When equipment or circuits are deenergized, they must be rendered inoperative and have warning tags placed at every point where energization could occur. Rendering inoperative means making the equipment unable to start or supply power again—this involves actions like opening the main disconnect, removing fuses, or disabling control circuits so no energizing path remains, including any control or start functions. The tags then travel with the equipment at all energizing points to warn others not to energize it and to identify who is responsible and when the work was done. This combination prevents inadvertent re-energization and communicates the hazard. Insulating the equipment isn’t the mandated status and doesn’t guarantee that energy cannot be applied. Grounding is about providing a safe path for fault currents and isn’t the requirement for deenergizing. Disconnected can isolate the circuit, but it doesn’t guarantee that all energizing paths are disabled or that stored energy is released, and Subpart K specifies rendering inoperative along with tagging.

This item tests how Subpart K handles controlling hazardous energy when work is done on equipment. When equipment or circuits are deenergized, they must be rendered inoperative and have warning tags placed at every point where energization could occur. Rendering inoperative means making the equipment unable to start or supply power again—this involves actions like opening the main disconnect, removing fuses, or disabling control circuits so no energizing path remains, including any control or start functions. The tags then travel with the equipment at all energizing points to warn others not to energize it and to identify who is responsible and when the work was done. This combination prevents inadvertent re-energization and communicates the hazard.

Insulating the equipment isn’t the mandated status and doesn’t guarantee that energy cannot be applied. Grounding is about providing a safe path for fault currents and isn’t the requirement for deenergizing. Disconnected can isolate the circuit, but it doesn’t guarantee that all energizing paths are disabled or that stored energy is released, and Subpart K specifies rendering inoperative along with tagging.