What is the amperage of a 4/0 copper wire?

To determine the amperage capacity of a 4/0 copper wire, it is important to refer to the American Wire Gauge (AWG) standards, which provide guidelines for the current-carrying capacity of wires based on their size and material.

A 4/0 (four aught) copper wire can typically carry approximately 426 amps when used in specific conditions, such as when properly installed in a raceway and at standard ambient temperatures. This capacity can change based on factors like the type of installation (e.g., whether the wire is in free air or inside a conduit), the temperature rating of the wire insulation, and how many conductors are bundled together.

This value is grounded in practical applications from the National Electrical Code (NEC), which informs electricians and professionals on safe wiring practices. Therefore, for a standard 4/0 copper wire, the amperage rating is around 426 amps under typical usage conditions, confirming why this is the correct answer.