I need some help with a small code problem. For some reason I have it stuck in my mind that whenever you install drop in troupher style flourescent fixtures, they need to be independently supported from the grid.
I have looked and looked but no luck. Is this a figment of my imagination, or am I missing something?
Did you come from MA, Because that is a requirement here.
410.16(C) Add a second paragraph as follows
In addition to, or in lieu of, the mechanical fastening means, electric luminaires (fixtures) containing ballasts, other than simple florescent reactance ballasts, shall be supported by wire, chain or threaded rod of sufficient strength to carry the luminaire (fixture). Fluorescent luminaries (fixtures) shall be supported at each end of the diagonal axis of the luminaire (fixture).
Bob Badger Construction & Maintenance Electrician Massachusetts
Re: Lighting in suspended ceiling#24632 04/16/0309:01 PM04/16/0309:01 PM
NJElectricmaster: The NEC requires fixtures to be attached to the grid by screws, clips, or other approved means. In most locations in NJ, the fixtures are independently supported from the structure via diagonal ceiling wire. Don't feel bad, this is a common question around here. Sparkies not familiar with the "local" AHJ usually ask..."screw/clip" "tie-wire" or "both"??? The Fire sub-code requires the independent support of the fixtures. The reasons that I've heard are to prevent the fixtues from coming down if the firemen rip the grid.
How about is Don....any comments?????
Re: Lighting in suspended ceiling#24633 04/16/0309:04 PM04/16/0309:04 PM
John, It is in a number of building codes to prevent the fixtures from falling when the grid is damaged. It could help prevent them from falling under fire conditions, but even with independent tie wires, I doubt that they will stay when hit with a fire stream flowing almost 1 ton of water per minute. Don
Re: Lighting in suspended ceiling#24635 04/16/0309:18 PM04/16/0309:18 PM
I try to secure at least the 2 corners diagonally across from one another. And put ties from the ceiling or structure above to the fixture, in addition to the clips that come with the fixture. All wiring must be supported independent of the grid also.
Re: Lighting in suspended ceiling#24638 04/21/0306:58 PM04/21/0306:58 PM
Jon: I do a lot of commercial work and what most inspectors have me do if I install grid wire for fixture or flex whip supports is to identify it either by painting it or phase tape. That way they can see that I installed it and I am not using any existing wire. Being I sometimes work in different parts of the state, I usually check with the inspector when he gives me an underground or wall rough on what he wants done with the fixtures. Saves a lot of hassle later down the road and promotes good relations too.
Re: Lighting in suspended ceiling#24639 04/21/0307:11 PM04/21/0307:11 PM
So you don't have earthquakes in Illinois? So CA, basically 2 wires on diagonal ends of the 2X4 or 2X2 lay-in. Screwed to the grid on the opposing corners. Lost Angeles has some jurisdictions with 4 wires, 4 screws..weeding them out is tough...S