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#24630 - 04/16/03 08:54 PM Lighting in suspended ceiling  
njelectricmaster  Offline
Joined: Apr 2001
Posts: 109
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

Jon Niemeyer

Work Gear for Electricians and the Trades

#24631 - 04/16/03 09:08 PM Re: Lighting in suspended ceiling  
iwire  Offline
Joined: Jan 2003
Posts: 4,391
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

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

#24632 - 04/16/03 10:01 PM Re: Lighting in suspended ceiling  
HotLine1  Offline

Joined: Apr 2002
Posts: 6,853
Brick, NJ USA
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?????



#24633 - 04/16/03 10:04 PM Re: Lighting in suspended ceiling  
njelectricmaster  Offline
Joined: Apr 2001
Posts: 109
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

Jon Niemeyer

#24634 - 04/16/03 10:16 PM Re: Lighting in suspended ceiling  
resqcapt19  Offline
Joined: Nov 2000
Posts: 2,148
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.


#24635 - 04/16/03 10:18 PM Re: Lighting in suspended ceiling  
Ron  Offline
Joined: Mar 2002
Posts: 582
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.


#24636 - 04/17/03 11:45 PM Re: Lighting in suspended ceiling  
njelectricmaster  Offline
Joined: Apr 2001
Posts: 109
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

Jon Niemeyer

#24637 - 04/18/03 03:13 PM Re: Lighting in suspended ceiling  
SJT  Offline
Joined: Jul 2002
Posts: 241
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.

#24638 - 04/21/03 07:58 PM Re: Lighting in suspended ceiling  
fla sparkey  Offline
Joined: Aug 2002
Posts: 47
Winter Haven, Florida USA
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.

#24639 - 04/21/03 08:11 PM Re: Lighting in suspended ceiling  
electure  Offline

Joined: Dec 2000
Posts: 4,260
Fullerton, CA USA
So you don't have earthquakes in Illinois? [Linked Image]
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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