The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by gfretwell
10/24/16 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
HotLine1 7
ghost307 7
renosteinke 6
Potseal 4
Who's Online
0 registered (), 325 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#49380 - 03/05/05 12:49 PM "four tube flange type flourescent light"
sparkync Offline

Registered: 10/17/02
Posts: 811
Loc: NC
I have installed the 2 tube flange type flourescent light before, but I have a need of installing 6 four tube recess flanged type lights in sheetrock. The ceiling joist are 2ft. on center. I called my supply house and they said the dimensions were just like a "lay in light". Since the ceiling joist are 2 ft. on center, a full 24 inches wouldn't work unless this dimension is for the trim only, then the "body" of the fixture tapers off, so it will fit in between the ceiling joist. Has anyone installed these type before? Do they fit in between the 2 ft. ceiling joist?
Called another lighting place and they said the measurements were 23 1/2 X 48 1/2 . Surely they would make one that would fit in between regular ceiling joist. Thanks for the help. Steve.

Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#49381 - 03/05/05 02:53 PM Re: "four tube flange type flourescent light"
HotLine1 Offline


Registered: 04/03/02
Posts: 6792
Loc: Brick, NJ USA
You hit a good point. We have put in a few over the years. They come in two parts, a frame, and the fixture body. Can't really say what the dimensions are/were exactly. We do all comm work, 99% is sheetmetal framing. 24" o/c framing usually has a rough 22-1/2" space. Catalog I have now says width 23-3/4"; mounting brackets fully adjustable over 3-1/4" range from within installed fixture. BTW, the 23-3/4" is the same as a 2x4 lay-in.


#49382 - 03/05/05 03:48 PM Re: "four tube flange type flourescent light"
HLCbuild Offline

Registered: 12/05/04
Posts: 206
Loc: Herndon,Va USA
I've done this in the past with a Mobern Electric Corp recessed flanged 4 ft x 1 ft 4 lamp fixture. It fit betreen 16" oc joists and is flanged for the drywall. Model # RF121-440E (

#49383 - 03/05/05 04:28 PM Re: "four tube flange type flourescent light"
George Offline

Registered: 02/23/02
Posts: 380
It could be worse:

3-1/2" flanges on I-joists with 24" spacing only leaves 20-1/2".

#49384 - 03/05/05 06:43 PM Re: "four tube flange type flourescent light"
sparkync Offline

Registered: 10/17/02
Posts: 811
Loc: NC
Anybody know a picture and specifications on the web here anywhere. I went to Lithonia, but I can't find one in their catalog or on the net. I must be missing it somewhere. I really need to find some dimensions and specs before Monday if I can. The 1 X 4's that I've done in the past, came with the flange and body together, no adjustments. I guess the 23 1/2 spec's that I was given would squeeze into the 22 1/2 " opening if it wasn't for the sheetrock will already be nailed which will hold the ceiling joist secure with no "give". I'm guessing it will work, but would like to know for sure. I don't like the idea of "beating it in there" if you know what I mean. What's the good of having a fixture you can't use? You can't cut a ceiling joist legally and pratically There's gotta be something I'm missing here somewhere.. Thanks again.. Steve

#49385 - 03/06/05 01:53 PM Re: "four tube flange type flourescent light"
LK Offline


Registered: 01/21/03
Posts: 1721
Loc: New Jersey
When we order this type of fixture, it usually takes 4 to 6 weeks to get them.

Try this site for more info on this type fixture,


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals