A side note about the "idiot" electrician... In addition to the upside down outlet on the 30A circuit for the compressor, I asked for a 50A circuit in the garage for a welder. It was shown in the electrical plan, and being OCD, I drew its location on the wall and wrote "50A" next to it:
They came in and roughed everything in, and I didn't give it a second thought until they came back weeks later when drywall was up to do finish electrical. I noticed that they put in a 40A breaker, and said that I wanted a 50A circuit. Well, the tech (different from the original tech) said that the previous tech roughed in 8 AWG wire, not 6 AWG. So much for the 50A circuit. That's what I get for not doing things myself (or checking others' work closely).