I asked about a 10 gauge wire and he said it’s overkill.
All electricians say this, at least in my experiences.
Overkill is what this hobby is all about though. ;^)
You almost have to buy the supplies for them, in fact I did. The electrician will just shake his head and look at you funny when he sees the crazy wire and outlets in your hands. He’ll tell you that anything at Home Depot would work just as well. Maybe he is right and us audiophiles are wrong.
I think electricians don’t want to use 10 gauge because 12 gauge is easier to work with, and does fulfill the code.