Leland,
406.8(B)(1) exception is new and IMO allows you to get away from the bubble cover in a car wash even though you are not high pressure washing the wall or receptacle cover. I could be all wet in my understanding of this. Also, there are metal bubble covers on the market.
406.8(B)(2) applies to receptacles other than the ones in (B)(1) such as a 30 amp or larger receptacle.
Lastly, I've always had problems with damp locations. I've never seen a really good definition of a damp location. How far back under the porch roof is the receptacle? If the AHJ feels that the wind could blow rain back that far, then it is a wet location. I've always stuck to the 45 degree installation. If you draw a line extending back from the edge of the roof 45 degrees and the outlet or other equipment is above the line, it is a damp location, below the line a wet location. If the wind is strong enough to blow the rain at a greater angle, a bubble cover is the least of your worries.
Tom
