What is the minimum size copper wire allowed for residential branch circuits in Colorado?

The minimum size copper wire allowed for residential branch circuits in Colorado is 14 AWG. This wire size is typically adequate for the ampacity requirements of general lighting and receptacle circuits in residential settings, which are commonly rated for 15 amps. Using 14 AWG wire ensures that the circuit can handle the typical load demands without overheating, while also allowing for safe and efficient operation under normal conditions.

In residential installations, electrical codes and regulations mandate specific wire sizes based on the expected load and ampacity. Choosing 14 AWG is consistent with the National Electrical Code (NEC) guidelines, which stipulate that this wire size is suitable for most residential branch circuit applications, hence ensuring safety and compliance. It is important to note that larger wire sizes, like 12 AWG or 10 AWG, while they are suitable for higher ampacity circuits, are not required for standard residential lighting and outlet circuits.