Re: Dryer Outlet
When 220.18 says to use 5000 watts (or the nameplate rating, whichever is higher) for the load calculation, you do not have to add a 25% factor on top of that. No matter that there is a heater or a motor. The code points to other sections for space heaters (which this is not!) and for motors. But it has an explicit description of what to do with dryers.
I would call this dryer a 25 amp load. That is 83.3% of the rating of a 30 amp branch circuit. True, but irrelevant. Per the second sentence of 210.23, since this is an individual branch circuit (i.e., no other outlets), the load can be as high as 30 amps.
Bottom line (in the order of your questions):
(1) No.
(2) Yes.
(3) Yes.