Firefighters will often "open" ceiling to check for fire spread or to apply water. With a grid ceiling they will not attempt to pull the grid down, but only pull down the tiles. The grid falling around them creates the very real possibility of entanglement and is not something that would be done intentionally.
The reason for the "identified" supports in a fire rated ceiling has to do with the rating of the ceiling. There are very specific construction rules for fire rated ceiling assemblies. The only reason for the identification of the electrical support wires is to make it easier for the building/ fire inspector to verify the fire rated ceiling assembly has been correctly constructed. The fire rated ceiling assembly design does not include the support of anything other than the ceiling itself. The support of electrical conduits or cables using the fire rated ceiling support wires would void the fire rating of the ceiling.
Don
