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#54810 - 08/08/05 09:15 AM wiring system supported from grid  
Jps1006  Offline
Member
Joined: Jan 2004
Posts: 615
Northern IL
I'm having trouble finding references. When I'm done typing this I'm going to go
https://www.electrical-contractor.net/the_store/NEC_Code2002.htm?RCKeepShoping=Keep+Shopping

and get myself the 99'-2002 handbook on CD rom.

I've been told no electric on the grid, only power directly associated with grid mounted fixtures can be supported by the grid, power can be supported as long as it has dedicated pencil rods gong to it etc., etc.

Is there an NEC reference or is this a building code issue. I'm sure it is also a local issue.


Work Gear for Electricians and the Trades

#54811 - 08/08/05 09:20 AM Re: wiring system supported from grid  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
300.11

Roger


#54812 - 08/08/05 09:30 AM Re: wiring system supported from grid  
Jps1006  Offline
Member
Joined: Jan 2004
Posts: 615
Northern IL
Quick. Thanks Roger. Now I'd like to see you with a pistol.


#54813 - 08/08/05 10:24 AM Re: wiring system supported from grid  
Jps1006  Offline
Member
Joined: Jan 2004
Posts: 615
Northern IL
Okay, so under what circumstance would these:
http://www.erico.com/products/CADDYcfcElecCompSprts.asp

be used? Are these only for the exception?

For you inspectors, under what conditions do you allow wiring fastened to the grid? Do you require ceiling manufacture's instructions allowing such?


#54814 - 08/08/05 02:13 PM Re: wiring system supported from grid  
earlydean  Offline
Member
Joined: Dec 2003
Posts: 751
Griswold, CT, USA
Ceiling grids come in three basic weights. If you find the heavy duty weight, it may be sufficient to attach the conduit to the grid. Light duty grid, never. Yes, it is required by the building code to obtain the permission of the engineer who designed the ceiling grid to attach the wiring to the grid. We lowly electricians never know the weight of the tiles, nor the capacity of the supporting wires, nor the weight of the grid.
Seems kinda odd, because the weight of the fixtures is often much greater than the weight of the wires, and there is no limit on the number or weight of fixtures in the NEC, other than the manufacturers installation instructions.


Earl

#54815 - 08/08/05 06:44 PM Re: wiring system supported from grid  
straightedge  Offline
Member
Joined: Mar 2002
Posts: 86
Mesa, AZ
Here in Phoenix, AZ we run our own grid wires that are painted red to allow the inspector to differentiate our wires from the grid guy's wires. Then we use these, http://www.erico.com/products/CADDYcfcConduitHangers.asp

When using conduit you need to use the #9 wires, which are thicker than the the normal #12 wires. #12 wires are sufficient for running mc cable.

You will need to use these with the #9 wires so you don't bend the grid and it helps to differentiate from the grid guy's wires. http://www.erico.com/products/CADDYcfcIndElectDrp.asp


#54816 - 08/08/05 10:15 PM Re: wiring system supported from grid  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
Prooving once again that great minds think alike.....
With luck, tomorrow there will be a pic in the Photo forum, with exactly this same question!


#54817 - 08/08/05 10:18 PM Re: wiring system supported from grid  
Jps1006  Offline
Member
Joined: Jan 2004
Posts: 615
Northern IL
Looking forward to it. I searched the archives and was suprised to see little discussion on the topic over the last 5 years. Then, within hours of each other......


#54818 - 08/08/05 10:51 PM Re: wiring system supported from grid  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,069
Estero,Fl,usa
I may have oversimplified the rules but when I looked at wiring methods supported above a "T"bar, I just satisfied myself that the load was being carried by a support method other than what the "T"bar guy installed to hold up his stuff. If there appeared to be a different kind of wire than the ceiling support and that was carrying the electrical it was OK with me.
There is a lot of "judgement call" here.
I was really just happy to see it was't laying on the ceiling tile but I did try to enforce the intent of the code.
Before they tightened up this article there was really a lot of abuse in suspended ceilings, like MC daisy chained between the layins, with no support at all.


Greg Fretwell

#54819 - 08/10/05 01:24 PM Re: wiring system supported from grid  
Dnkldorf  Offline
Member
Joined: Dec 2004
Posts: 1,064
nowhere usa
Here's something I always wondered:

How do the cieling guys attach the wire to the building supports without having to reach up there?

Is there some pole that they use, standing on the floor and twisting the wire in place?

Any help...


Dnk......


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