Frankly I don't understand all the concern. And I made a pretty decent living at this stuff from 67 on. RF and Signal Circuits wire dress is important, 60 HZ power not so much. What is important is to always have enough excess wire for at least one repair.
At church we just paid a licensed electrician to set up a sub panel at church and he wired a 3500 watt 110 volt on demand water heater at 20 amps. I really don't care how square his corners are he doesn't have a clue. And he is no beginner. Women were wondering why they never got the dishes washed...