What is the minimum size gauge for class 3 circuits according to NEC?

The National Electrical Code (NEC) specifies that Class 3 circuits are low-voltage circuits that have a maximum voltage of 100 volts and can carry a current of up to 5 amperes. In terms of wire gauge, the minimum size gauge for class 3 circuits is 22 AWG (American Wire Gauge). Using a gauge that is larger than 22 AWG can lead to increased resistance, which might affect the performance of the circuit, particularly in terms of voltage drop and heat generation.

Choosing 22 AWG ensures that the circuit can safely handle the power requirements while remaining within the regulated specifications for Class 3 circuits. This gauge is also standard for many low voltage applications, making it a common choice for installers and electricians working with low-voltage systems.