If a disconnect switch is rated for 600 Volts, in which applications can it be used?

A disconnect switch rated for 600 Volts is designed to safely interrupt the electrical circuit at voltages up to that limit. This means it can reliably handle voltages that are equal to or lower than its rating, making it suitable for various applications within that range.

The applications of 277 volt and 480 volt are commonly found in commercial and industrial settings. These voltages correspond to standard electrical systems used for lighting, HVAC, and motor control, making the use of a 600 Volt rated disconnect switch appropriate and safe in both cases.

In contrast, applications listed in the other choices involve voltages that exceed 600 volts. Using a disconnect switch rated for 600 volts in those environments would pose safety risks and potential equipment failure, as it would not be capable of handling the higher voltages. Hence, the correct option highlights the practical and safe application of the disconnect switch within its specified voltage rating.