What is the common gauge size for household wiring?

The common gauge size for household wiring is primarily 12 and 14 AWG. This sizing is based on the National Electrical Code (NEC) guidelines that designate these gauges for specific applications within residential wiring.

12 AWG wire is typically used for circuits that require a maximum of 20 amps, such as outlets in kitchens and other areas, while 14 AWG wire is commonly employed for lighting circuits and outlets that only need a maximum of 15 amps. This sizing is beneficial because it balances safety, load capacity, and the flexibility of installation, allowing for adequate current flow without excessive voltage drop.

When comparing to other gauge sizes, such as 10 and 14 AWG, 8 and 10 AWG, or 6 and 8 AWG, these are generally reserved for heavier-duty applications or equipment, like major appliances or specialized circuitry that necessitates a higher capacity wire. These heavier wires are not typical for general household use, which is why 12 and 14 AWG are more prevalent in standard wiring scenarios.