What is the minimum ampacity for conductors supplying outlets in a dwelling?

The minimum ampacity for conductors supplying outlets in a dwelling is set to 15 amps according to the National Electrical Code (NEC). This requirement is primarily aimed at ensuring safe and sufficient power delivery to standard receptacles, which are typically used for general purpose outlets in residential applications.

Selecting 15 amps as the minimum allows the conductors to handle the expected load from common household appliances and devices without being overloaded, while still maintaining safe operation. The NEC specifies this rating to help prevent overheating of the conductors, which can lead to insulation breakdown, safety hazards, and potential fire risks.

This ampacity aligns with standard practices for circuit design in residential settings, making it a critical consideration in both new construction and renovation projects.