What gauge is required for class 3 circuits under NEC guidelines?

For Class 3 circuits under the National Electrical Code (NEC) guidelines, the required gauge is 18 AWG. Class 3 circuits are typically used for low-energy circuits, such as those for alarm systems, signaling, and similar applications, ensuring that they operate safely and effectively without posing a fire or shock hazard.

Using 18 AWG wire for Class 3 circuits allows for the transmission of power to devices with lower voltages, typically up to 100 volts, and a current limit of 5 amperes. This gauge provides an appropriate balance between current-carrying capacity and reduced physical bulk, making it suitable for installations where flexibility and ease of handling are important.

Adhering to the NEC’s specifications helps ensure that installations remain compliant with safety standards while also meeting the performance requirements for low voltage applications.