Where accessible to other than qualified persons, a means shall be provided to disconnect a(n) ___ associated with ESS equipment where it is energized from both directions.

• A. Initiating device
• B. Disconnecting means
• C. Output circuit
• D. Fuse

Answer: (D)

When dealing with energy storage systems that can be energized from multiple directions, it’s essential to have a safe, accessible way to stop all energy flow to the equipment so anyone nearby can work without exposure to live parts. The device that best provides a reliable way to interrupt and isolate that energy path is a fuse, used as part of a fuse-disconnect arrangement. Fuses are designed to interrupt current and, when arranged to disconnect the ESS, give a clear means to de-energize from both directions. This directly supports safe service by non-qualified persons by ensuring there’s a tangible, accessible disconnection point for the energy path. The other options don’t provide that isolation role: an initiating device is for starting circuits, a generic disconnecting means is too vague, and the output circuit is the path being disconnected rather than the device that accomplishes the disconnection.