What is the amperage for 4/0 TPX?

The correct amperage for a 4/0 TPX (copper conductors) is typically around 348 amps for a specific type of application, such as in a continuous rating scenario at a reasonable temperature rating. However, it’s important to note that in practice, the actual amperage capacity can vary based on factors such as insulation type, ambient temperature, and whether the conductors are in a raceway or free air.

In this scenario, the choice indicating 235 amps might reflect an application based on different conditions, such as a lower temperature rating or factors that restrict the maximum allowable current. This amount is below what would typically be expected for 4/0, suggesting it could be a conservative figure based on specific regulations or manufacturer guidelines.

Understanding these variations can help linemen apply the correct loads based on the environment and installation conditions, ensuring safety and adherence to electrical codes. Thus, it's critical to refer to the National Electrical Code (NEC) tables or specific manufacturer's specifications for exact ratings tailored to your situation.