Hello, first post here, been a lurker for awhile now.
This is being enforced in Calif, has been for a few years now in the PV installs at the very least (DC and AC conductors).
Whether by NEC 2005 as 690.31(C) or NEC 2008 as 310.15(B)(2)c and/or 690.31(C).
Each jurisdiction is different and some even have their own correction factor regardless of what the code says.
Oh, the temp in conduit is higher above a white roof than a black roof.