In limiting brand-circuit voltage, which voltage range is specifically noted for auxiliary equipment wiring?

The voltage range of 277-600 volts is specifically noted for auxiliary equipment wiring as it aligns with the requirements outlined in the National Electrical Code (NEC). This range is important for various types of auxiliary equipment, which often operate at higher voltages compared to standard branch circuits that operate at lower voltages such as 120 volts.

Auxiliary equipment often includes devices that require higher starting torque or specific operational characteristics, making the 277-600 volts range suitable for their needs. This voltage level is commonly found in commercial and industrial applications, where heavier-duty electrical systems are utilized. The specification of this voltage range helps to ensure that the wiring and associated equipment can handle the electrical load safely and effectively, while also adhering to NEC requirements designed to protect both the equipment and those who interact with it.

In contrast, the other voltage ranges provided do not pertain specifically to auxiliary equipment wiring, as they typically cover standard circuit applications, which are distinct from the needs of auxiliary setups that might demand higher operating voltages.