What must the service disconnecting means plainly indicate?

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

Answer: (B)

The key idea is clear awareness of the disconnect’s operational state. The service disconnecting means must plainly show whether it is open or closed so anyone approaching it can instantly tell if power is flowing or not. This simple status indicator is crucial for safety during maintenance, lockout/tagout, and in emergencies, ensuring you don’t assume the circuit is de-energized when it isn’t. Other details like fuse size, voltage rating, or horsepower rating are important specifications, but they don’t tell you the current on/off state of the disconnect itself, which is why the open/closed indication is the essential requirement.