What is the minimum size for underground copper service conductors?

The minimum size for underground copper service conductors is determined based on the requirements outlined in the National Electrical Code (NEC). For most residential applications, the NEC stipulates that the minimum size for underground copper service conductors is 6 AWG.

This size is essential to ensure that the conductors can safely carry the expected load without excessive heating or voltage drop, which can lead to inefficient operation or potential hazards. The choice of 6 AWG as the minimum size ensures adequate capacity and helps maintain the integrity of the electrical system over time.

In the case of larger service requirements or special conditions, other factors may influence the selection of conductor size, but for standard installations, 6 AWG for copper conductors is the accepted minimum. Therefore, while 8 AWG may be listed in the options, it does not meet the NEC's requirements for minimum conductor size in underground applications.