We are required in most places around here, to attach some kind of additional support, usually ceiling wires, from the structural ceiling to all lighting fixtures that are installed in a grid ceiling. I don't believe this is required in the NEC, but I want to know what code requires this. Nobody's ever given me a straight answer for this, we just do it if the inspector says to. We also attach the clips from the fixture to the grid, which is required by 410.36(B)
