For a service switchboard rated over 5000A, what is the ampacity requirement for copper bus bars?

In accordance with the National Electrical Code (NEC) and related standards, the ampacity requirement for copper bus bars becomes increasingly specific as the service switchboard's rating rises. For service switchboards rated over 5000A, the ampacity requirement is established to ensure effective heat dissipation and reliable performance.

The correct ampacity for copper bus bars for such high capacities is 700 ft per square inch. This value is crucial for maintaining efficiency and safety, as it accounts for the higher current-carrying requirements and the thermal management necessary for operations at elevated amperage levels.

Using this standard, engineers and electricians can properly design and install service boards that will safely handle the expected electrical load while minimizing the risk of overheating or failure, which is paramount in high-demand electrical environments. Therefore, the specification of 700 ft per square inch aligns with industry practices aimed at ensuring safe and reliable electrical installations for substantial loads.