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)
your answers are located in 300.11, 410.16(C) If you have 2005 NEC handbook read 300.11 explanation goes over it . Most ceilings have to be Listed & Labled to carry the additional weight. Theres also an issue here with Boxes & wiring attacted to ceilings .
300.11 just addresses the wiring, boxes and fittings. I'm just tal;king about the luminaires---particularly lay-ins, but some inspectors require all recessed lights, cans, etc. to be independently supported from the grid. 410.16(C) 2005 or 410.36(B) 2008 only states that the grid itself must be securely fastened to itself and the structure, and that the fixtures must be fastened to the grid. I'm looking for another code, like for instance a building or fire code.
Man! I cannot comprehend living this way! Every Neighborhood has different rules. Ok done with that.
Think liability. How much does a box (roll-depending on supplier)of jack chain cost? How much to defend yourself in a lawsuit from Mary at the desk or Joe on the local FD?
It is all (supplemental support)2nd nature here in Mass.,Been on the books for ever. One that I agree with. This code seems to be the only thing authority gets right. Perhaps because the board (for the most part) is all volunteer.
As an EC, doing primarily comm work I always had support wires installed for lay-in's, irregardless of 'code'.
The hassles of the Elec Insp passing 'ceiling, and then the Bldg or Fire Inspector leaving a red tag was a pain. This was a pain from way back when a lay-in was made slightly heverier then a empty six pack of alum cans.
Most of the comm guys here do install wires, although I cannot mandate it thru NEC. Sometimes more is better.
In addition to, or in lieu of, the mechanical fastening means, electric luminaires (fixtures) containing ballasts, other than simple fluorescent reactance ballasts, shall be supported directly to the building structure by wire, chain, or threaded rod of sufficient strength to carry the luminaire (fixture). Fluorescent luminaires (fixtures) shall be supported at each end of a diagonal axis of the luminaire (fixture).