Is it permissible to use aluminum conductors for service entrances?

Using aluminum conductors for service entrances is permissible under the National Electrical Code, provided they are properly sized and installed according to NEC requirements. The code allows aluminum conductors to be utilized in various applications, including service entrances, as long as they meet specific guidelines regarding sizing and installation practices.

Aluminum conductors have unique properties and require careful consideration regarding their ampacity, connections, and terminations to prevent issues such as overheating or corrosion. Proper sizing is crucial as it ensures that the conductor can safely carry the electrical load without exceeding its rated capacity.

In addition, installation methods must adhere to NEC standards, which include requirements for the conductor's insulation, connection methodology, and environmental considerations. By following these stipulations, aluminum conductors can be safely used in service entrance applications.