I imagine this will still be surprising to the guys who slept through that part of their code update and "never did it that way before".
I suspect the code language was really just trying to recognize you needed an adjustment and they did not want to get into the detail of raceway color, roof color etc. This is complicated enough as it is. How many guys know where to find the ASHRAE data?
I see this biting the guys who should understand, the hardest, the solar installers. I wonder if they know they should derate the conductors in their DC raceways? 690.8 doesn't seem to mention it.
I can also see this getting the HVAC installations and the guys who are installing to the label on the condenser.
Is this really being enforced?
