I had to learn about electricity when I learned about HVAC, not an expert, but extensive knowledge. In my shop, I ran outlets, three to one breaker, lights, all flouresent, two breakers, one each for each side of shop. all those were run in 12/3. 220v circuts were all run with 10/2, and all machines have a serparate CB. DC is on separate CB circut also. I ran a 50 amp circut from my main house panel to my shop and had a subpanel in the shop. That was also grounded properly with it's own 8' rod, I used #6 copper to my shop in conduit, less then 50 feet. Have had no problems and never tripped a CB. I wish I had a pic of how the shop was wired prior to my buying the home. No outlet or light was grounded, it had two circuts for the 28' x28' shop, and one 220v circut that was wired before the power entered the two fuse, fuse box. Screw in fuses. No protection what-so-ever on the 220v circut. I scrapped all that, had to ground all outlets and light, separate the light circuts into two. Cut and separated outlets, ran new wires. All the electric had to be added after the final inspection, when the shop was built, because the electrical would never have passed.