Hey Leland... There is truth to this, however the union did not get it "passed" as it has always been in the code book and regarded as electricians work. There were some companies trying to circumvent the licensing board to get this work "unregulated" as far as licensing goes so they could put anybody up on a roof to install these and then just have a licensed electrician do the final connections. The union has simply pushed to keep this work for qualified, licensed electricians to install.
No offense guys but I think I want a roofer drilling the holes in my roof (and patching them back up again) I agree an electrician should be hooking up the collectors but I want a roofer installing them.
The collectors don't don't mount to the roof, they mount to racks which mount to plates that are secured to the roof. There are products designed that can be screwed to the rafters and the screws pull butyl sealant pads into the holes that seals it up and are guarenteed to not leak. Would it hurt to have a roofer on the job to install them? Probably not, but there are products out there that are proven that can be used. Of course all of this depends on your location and roofing type. With that said, I do work with a roofer for all my penetrations. I do not like the idea of being responsible with the roof.