According to NEC Article 240.4(D)(5), what is the maximum ampacity allowed for 12 AWG copper wire?

The maximum ampacity allowed for 12 AWG copper wire is 20 amps, which aligns with the provisions set forth in NEC Article 240.4(D)(5). This standard outlines the appropriate sizing of conductors to ensure safety and prevent overheating, which can lead to insulation failure and potential fire hazards.

According to the NEC, 12 AWG copper conductors are typically rated for a maximum of 20 amps in residential and commercial settings when considering factors such as the conductor's insulation type, ambient temperature, and installation conditions. It’s essential to adhere to these guidelines to ensure the electrical system operates efficiently and safely.

Understanding the ampacity limitations is crucial for electricians in order to select the correct wire size for a given application, ensuring that circuits are not overloaded and that they can safely handle the electrical load.