90 degree radius in a firewall?

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innersurffer

innersurffer

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St Petersburg (Have lived in Lakeland, Miami, Ft L
I not sure what the standards for an electrical room that has fire rated walls concerning 90 degree bends radius turning just as it penetrates the wall. It looks something like a waterfall as it penetrates the wall. Most of my practice's concerning turning conduits in a fire rated wall are to come straight through and not to turn the radius of the conduit in the wall. I know it is difficult to seal (properly) the conduit in this situation. My head project foreman complained to me about bringing out a 90 out of the wall of the electrical room instead of turning the radius in the wall. It just doesnt look good and is hard to seal around. Any related codes? I know in the hospital I worked in for 6 years they would not allow this "waterfall" practice because of ACHA. Is there any other standards and practices book I can show him to dicourage this practice as a standard practice method? Links to fire rated codes not feelings would be helpful.
 
If the IBC is the applicable building code in your area, then Section 712 is the section that covers penetrations through fire rated walls. Specifically, Section 712.3.1.2 states:
Through penetrations shall be protected by an approved penetration firestop system installed as tested in accordance with ASTM E 814 or UL 1479, with a minimum positive pressure differential of 0.01 inch of water and shall have an F rating of not less than the required fire-resistance rating of the wall penetrated.
Click to expand...

Fire stop manufacturers can provide tested assembly details for use with their products. I doubt any of them have a tested assembly detail that will cover the "waterfall" practice that you are describing.
 
How else are you gonna do it? I see a horizontal run in the wall [elev. 10'] and it reaches above the desired panel. It has to get out of the wall somehow. Assume the wall cavity is only 3 1/2".
Even with 1/2" EMT, it would be hard to get the 90? bend entirely perpendicular to the wall surface in that amount of space. What size is the conduit?
Why do we electricians have to do the drywaller's work for them? Drywall is easy to carve. Don't they have a combination square and chisel available?
~Peter
 
show me the codes related

show me the codes related

Appeciate the inputs and as far as getting in the room properly, foreplanning and shepards hooks come to mind. I need to know the Fire Standards codes relating to penetrating a firewall with EMT. Should it matter weather or not it is 1/2" or 4". Appreciate the ICCA standards but anything in the fire saftey book or fire code books? Maybe im asking the wrong forum?
 
Why not put a box on the end of the Vertical riser and come straight through the two sides of gypum? Or better yet go up and 90 (away from the wall) into a box and start a straight run of pipe through your fire wall.

I've seen electrician cutting the sheet rock edge with 15 half circles on two pieces of gypsum for a secondary double up the fire rating, of turned pipe through a fire rated wall. This was over existing Fire chaulk.

I've seen the Taper make it all pretty and the Fire chaulk applied. (not the correct way).

I've seen just about every combinations of Tape and mud and double back gypsum and fire chaulk, and not all of those where correct.

The best you can do is run a straight pipe with the minimum hole, if there are construction drawings there is probably a UL detail for Sealing off your penatration.

I know of no requirement or statement about kicked or bent pipe in walls in 2005 NFPA-70.

edit for grammer ...
 
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