Not for nothing but some of the roofs around here are very high. You need extension ladders to get to them. I don't think the fireman could reach the disco unless they were in a bucket truck.
Also the story I read about the fireman getting shocked came from a NFPA magazine.
I also like the new PV systems where they change the AC into DC right on the roof. Then the lines from the roof down can be inside or outside or wherever you want to run them. If the AC shuts down, the Inverter shuts off at the roof and the lines down are not energized. That is much safer in my eyes.
