What gauge wire is typically used in a 15A circuit?

In a 15A circuit, the typical wire gauge used is 14. This is because 14-gauge wire is designed to safely carry a maximum current of 15 amps, making it suitable for use in a 15A circuit. The National Electrical Code (NEC) outlines these standards for safe electrical installations, indicating that using the appropriate wire gauge is essential for preventing overheating and potential fire hazards.

Using a thicker wire, such as 12-gauge, while acceptable, is unnecessary for a 15A circuit and may not be cost-effective. Conversely, a thinner wire, like 16-gauge, is not rated to handle the 15 amps and would be prone to overheating and failure if used in such a circuit. Understanding these ratings and the purpose behind wire gauge selection is important for ensuring safe and efficient electrical systems.