According to the NEC®, what is the maximum voltage allowed on nonpower-limited circuits?

The National Electrical Code (NEC) establishes standards for safe electrical installation. When it comes to nonpower-limited circuits, the maximum voltage allowed is 600 volts. This classification applies to circuits that are not designed to be limited in their power output, which means they can carry higher voltage levels up to this maximum threshold without additional safety considerations prescribed for lower voltage circuits.

Understanding the context of nonpower-limited circuits is essential. These circuits are typically used in a variety of applications where a higher voltage is necessary to power devices or equipment. It is important for the design and installation of these circuits to adhere to the NEC regulations, as higher voltages can pose significant safety hazards, necessitating stringent installation practices.

In contrast, the other choices represent voltage levels that are below the maximum permissible for nonpower-limited circuits, thus not aligning with NEC specifications for these circuit types. For instance, while 120V and 240V are common in residential and light commercial applications, and 480V is typically utilized in industrial settings, they do not capture the full extent permissible under NEC for nonpower-limited applications, which extends to 600V.