The service disconnecting means shall plainly indicate which of the following?

• A. Its voltage rating
• B. The maximum horsepower rating
• C. The maximum fuse size
• D. Whether it is in the open or closed position

Answer: (D)

The emphasis here is safety through visibility of the shutdown status. The service disconnecting means must clearly show whether it is in the open (de-energized) position or in the closed (energized) position so anyone working on the system can instantly know if power is available. This immediate cue helps prevent accidental energizing or unexpected shock during maintenance or testing.

Voltage rating, maximum horsepower, and maximum fuse size are important specifications of the device, describing what it can safely handle or interrupt, but they do not convey the current on/off status of the supply. The essential safety indicator is the actual position of the disconnect, not its capability ratings.