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Old 04-12-2016, 09:12 AM   #1
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Default 2x4 lay in fixture measurement

What would be the minimum measurement from the grid to the structural ceiling to get a fixture in the grid.
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Old 04-12-2016, 09:38 AM   #2
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Depends on the fixture. Some are thicker than others.
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Old 04-12-2016, 10:05 AM   #3
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Depends on the fixture. Some are thicker than others.
They would be the Lithonia contractor select. The GT3mv. Looks like a depth of 3-1/8 inches
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Old 04-12-2016, 10:08 AM   #4
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With LED fixtures that number ought to be drifting down to next to nothing by now................
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Old 04-12-2016, 10:09 AM   #5
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I doubt there's a table anywhere with that info.....
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Old 04-12-2016, 10:15 AM   #6
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I usually figure 4" minimum.
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Old 04-12-2016, 11:53 AM   #7
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I usually figure 4" minimum.
Did they go in decent with out banging every thing up? I think the 4" is the minimum for the tiles that manufactures recommend. The light fixtures are kind of tough to bend.
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Old 04-12-2016, 01:12 PM   #8
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Quote:
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Did they go in decent with out banging every thing up? I think the 4" is the minimum for the tiles that manufactures recommend. The light fixtures are kind of tough to bend.
I meant that I usually figure the fixture as 4" thick. I always want as much headroom as possible in the ceiling. You want at least double thickness of fixture to have enough room to get it set without smashing the t-bar and scratching everything up.
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Old 04-12-2016, 02:27 PM   #9
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Many lay ins are wired from the top as well.
I'd say you need 12 inches of clearance to get a 4" lay-in without taking the grid apart.
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Old 04-12-2016, 06:39 PM   #10
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With LED fixtures that number ought to be drifting down to next to nothing by now................
Before long ceiling tiles are going to come standard with LEDs that make them glow and the grid itself will light them with 12VDC.
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Old 04-12-2016, 11:14 PM   #11
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Before long ceiling tiles are going to come standard with LEDs that make them glow and the grid itself will light them with 12VDC.
There's an idea!
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Old 04-13-2016, 12:38 AM   #12
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Most case useally 4 inches but i rather leave more room to install the lay in luminaires without getting the grid damaged...


But the actual height that will varies depending on the luminaires it being used ..
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Old 04-13-2016, 05:49 AM   #13
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I've gotten them into 4 1/2-5" or so, but you have to pop out a cross bar so you have more room to slide the beasty up, and have to wire it on the ground with whips and right angle mc connectors. Pain in the balls, but they wanted all the head room they could get.
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Old 04-13-2016, 07:06 AM   #14
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I've gotten them into 4 1/2-5" or so, but you have to pop out a cross bar so you have more room to slide the beasty up, and have to wire it on the ground with whips and right angle mc connectors. Pain in the balls, but they wanted all the head room they could get.
Just take a couple tie wires loose and slip it in. Just be sure put them back where you found them!
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Old 04-13-2016, 11:04 AM   #15
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Before long ceiling tiles are going to come standard with LEDs that make them glow and the grid itself will light them with 12VDC.
You are probably right about that. Grid bus low volt systems. The death of commercial electricians. Watch and observe.
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Old 04-13-2016, 11:13 AM   #16
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Quote:
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You are probably right about that. Grid bus low volt systems. The death of commercial electricians. Watch and observe.
If I never had to put in another GT8 I wouldn't blink an eye.
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Old 04-13-2016, 01:17 PM   #17
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Quote:
Originally Posted by macmikeman
You are probably right about that. Grid bus low volt systems. The death of commercial electricians. Watch and observe.
http://tbarledsmartlight.com/

http://www.armstrong.com/commceiling.../_/N-mZ1z141h7
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Old 04-13-2016, 01:27 PM   #18
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Check this: http://www.armstrong.com/pdbupimages/201068.pdf

Covered by Article 393- New to the 2014 nec
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Old 04-13-2016, 03:15 PM   #19
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(Every one of those f'ers owes me royalty money.)

OK those are going to be popular for a short while, then ceiling grids will all be smartglass displays like you see in this video


there will be cameras in them, they will watch you, and sensors to identify you by emanations from your cell phone, infrared to determine your disposition via temperature like the mood ring, and will tell your true character and predict your future by reading the bumps on your head. They'll confer with a big data mothership in the cloud and display images you find appealing, surrounded by ads you find irresistible.

We are going to make great pets!
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