The more I read this thread, the more I learn about fire alarm wiring above drop ceilings. I've decided that it can be there and would not have to be fastened directly to the structural ceiling but could be on hangers or similar fittings and when this is the case, one would have to look at 300.11 (A) (1) & (2). I said this previously and was echoed by Leland but there is an additional concern in 760.7 that need to be heeded.
