What is the smallest size copper wire allowed for house wiring according to the Code?

The smallest size copper wire allowed for house wiring according to the National Electrical Code (NEC) is No. 14. This wire size is commonly used for general-purpose circuits, particularly for lighting and receptacles. It is essential for ensuring safe and efficient operation of electrical systems in residential settings.

Using No. 14 wire allows for a load capacity of up to 15 amps, making it adequate for most household circuits while providing a margin of safety. Additionally, wiring that is too small for its intended load can lead to overheating and potential fire hazards. Therefore, adhering to the Code is critical in maintaining safety standards in electrical installations.

In contrast, larger gauges such as No. 10 and No. 12 are used for higher capacity circuits, while No. 16 is too small and not permitted for typical house wiring. Understanding these specifications helps ensure that electrical systems function properly and safely in residential environments.