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#24630 - 04/16/03 05:54 PM Lighting in suspended ceiling
njelectricmaster Offline
Member
Registered: 04/29/01
Posts: 109
Loc: Lead, South Dakota
Hello from South Dakota!!!

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?

Any help Please!

Thanks, Jon
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Jon Niemeyer
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#24631 - 04/16/03 06:08 PM Re: Lighting in suspended ceiling
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4391
Loc: North Attleboro, MA USA
Did you come from MA, Because that is a requirement here.

2002 MEC

410.16(C) Add a second paragraph as follows

Quote:
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).
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Bob Badger
Construction & Maintenance Electrician
Massachusetts
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#24632 - 04/16/03 07:01 PM Re: Lighting in suspended ceiling
HotLine1 Offline


Member
Registered: 04/03/02
Posts: 6776
Loc: Brick, NJ USA
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?????

John
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John
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#24633 - 04/16/03 07:04 PM Re: Lighting in suspended ceiling
njelectricmaster Offline
Member
Registered: 04/29/01
Posts: 109
Loc: Lead, South Dakota
Hello from South Dakota!!!

iwire, I am from Colorado, and I knew we had to do it there. I just can't find it in the NEC.

Thanks, Jon
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Jon Niemeyer
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#24634 - 04/16/03 07:16 PM Re: Lighting in suspended ceiling
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2148
Loc: IL
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
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Don(resqcapt19)
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#24635 - 04/16/03 07:18 PM Re: Lighting in suspended ceiling
Ron Offline
Member
Registered: 03/13/02
Posts: 582
Loc: White Plains, NY
You will not find it in the NEC. If it exists, it is a local modification of the building code.
Also, many engineers specify it, whether it is code minimum or not.
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Ron
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#24636 - 04/17/03 08:45 PM Re: Lighting in suspended ceiling
njelectricmaster Offline
Member
Registered: 04/29/01
Posts: 109
Loc: Lead, South Dakota
Hey guys, Thanks for all the responses. I knew I had seen that rule before I was just not sure it was code!

I really do love this site!

thanks again, Jon
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Jon Niemeyer
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#24637 - 04/18/03 12:13 PM Re: Lighting in suspended ceiling
SJT Offline
Member
Registered: 07/24/02
Posts: 241
Loc: PATCHOGUE, N.Y.
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.
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#24638 - 04/21/03 04:58 PM Re: Lighting in suspended ceiling
fla sparkey Offline
Member
Registered: 08/03/02
Posts: 47
Loc: Winter Haven, Florida USA
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.
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#24639 - 04/21/03 05:11 PM Re: Lighting in suspended ceiling
electure Offline


Member
Registered: 12/24/00
Posts: 4259
Loc: Fullerton, CA USA
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
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