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Jeff,
I misspoke, I am renovating and was sitting here looking at the 40A line stubbed out for a cook top. Yes, a dryer is typically 30A
My smaller 5hp compressor draws 21.8A running, and does fine on a 30A line.
Do they enforce the line of sight disconnects in a residential application in AZ? Here, it is only enforced in commercial / industrial applications. It is common sense though and a good safety factor.
We also only have to size a circuit based on 125% of the load if the load is continuous. I forget what the definition of continuous is with respect to the code. Is is 4 hrs? Again, this is what is enforced. I always set up my circuits to never be loaded at more than 80%. Any time I have doubts, I am on good terms with the electrical contractor that we use at work and often get a lot of advice and they make sure I am safe.
Adam