Size wire for 125 amp breaker?
I own a commercial building that we're turning into a restaurant that has two apartments above it. We've updated the electrical to international fire code, but I still need to run the wiring from the meters to the breaker box. The run will be about 100 feet and the breaker boxes are 125 amp. I'm looking for suggestions on wire size, this is what was given to me by a friend of mine. All wiring will be copper two #2 THHN for hot, one #3 THHN for neutral and one #4THHN for the ground. Do these sound right, I've looked at some of the online calculators and they all say to run #3 for everything.