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

Topic Options
Rate This Topic
#97836 - 04/04/06 06:10 PM Fire rated recessed lights
leespark Offline
Member
Registered: 01/17/04
Posts: 54
Loc: Massachusetts
Has anyone been required to used fire rated recessed fixtures or a product which will fire rate standard type fixtures?

It is a building code issue for fire rating between units in a 3 decker wood framed apartment building.

I have yet to see a fixture but I hear they are big $$. Are there alternate ways to fire rate the space ith the use of sheetrock?
Top
2017 / 2014 NEC & Related Books and Study Guides
#97837 - 04/05/06 12:06 AM Re: Fire rated recessed lights
e57 Offline
Member
Registered: 05/27/03
Posts: 2876
Loc: S.F.,CA USA
I have heard about a box that you can mount cans in, but I too, have yet to see one. And would bet on big $ per unit!

Otherwise we have the GC make rock boxes to install the cans in. Big PITA!

On a few lucky occasions in med/high rises, they have rocked the whole envelope of each unit then just dropped the cieling. SOOOO much easier for everyone!
_________________________
Mark Heller
"Well - I oughta....." -Jackie Gleason
Top
#97838 - 04/05/06 06:45 PM Re: Fire rated recessed lights
Jps1006 Offline
Member
Registered: 01/22/04
Posts: 615
Loc: Northern IL
check out this if you haven't stumbled across it yet
http://electrical-contractor.net/ubb/Forum18/HTML/000025.html
Top
#97839 - 04/14/06 07:01 PM Re: Fire rated recessed lights
tdhorne Offline
Member
Registered: 03/22/01
Posts: 345
Loc: Maryland, USA
Quote:
The fire tests are quite realistic; a very large piece of ceiling is constructed (appx 20 ft. sq), and is subjected to an enormous, controlled natural gas fire for a specific time. Temperatures are monitored on the "unexposed" face; for it will not do much good if the outside itself gets hot enough to light a new fire! Nor will it help if the structure is weakened to the point of collapse.
That test is based on the standard time temperature curve and actual structure fires are quite a bit hotter. The curve was developed from measurements of actual fires in ordinary occupancies (masonry bearing walls with wood joists and rafters). The testing was done in the days prior to the use of large amounts of synthetic materials in the built environment. The synthetic materials cause the fires to develop faster and they give up their BTUs much more quickly. So even though the synthetics average fewer BTUs per pound by burning so much more quickly they cause a much sharper temperature rise. The standard time temperature curve is still useful in comparing materials and techniques to each other but it no longer reflects the stresses that todays fires subject the materials to.
_________________________
Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison
Top
#97840 - 04/17/06 06:29 PM Re: Fire rated recessed lights
harold endean Offline
Member
Registered: 02/16/02
Posts: 2233
Loc: Boonton, NJ
I have seen several companies that had fire rated recess light fixtures. I think they are quite exspensive. I have also seen where the carpenter boxes the whole recess light fixture with 5/8" double sheetrock in order to maintain the fire rating and the building AHJ will accept that.
Top

Member Spotlight
Member Since: 02/23/13
Posts: 204
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 47 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Freecrowder, clee512, Jdscott2005, FAIZAN, Regitest2

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