what size wire for 125 amp service

[DeEmily]

For a 125-amp electrical service, you typically need #2 AWG copper wire or 1/0 AWG aluminum wire. An appropriate ground wire is also required, usually #6 AWG aluminum or #8 AWG copper. Always check local electrical codes and consult a qualified electrician, as factors like wire length, voltage drop, and installation method may necessitate a larger wire size.