What is the amperage for 2/0 CU?

The correct amperage for 2/0 copper wire is indeed 318 amps. This value is determined based on the electrical code standards, particularly under the National Electrical Code (NEC), which provides guidelines for the current-carrying capacity of conductors.

When sizing conductors, factors like the material of the wire (in this case, copper), the installation method, and the ambient temperature must be considered. For copper conductors, 2/0 wire has a substantial cross-sectional area, which allows it to carry a significant amount of current before reaching its maximum allowable temperature.

In practical application, this amperage rating ensures that the wire can operate effectively without overheating, thus maintaining safety and efficiency in electrical systems. Understanding these ratings is vital for electrical installations to comply with code requirements and to ensure reliability and safety in usage.