Fire wall

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Jim W in Tampa said:
Can a panel be mounted in a fire wall ? Would only have one layer of 5/8 drywall behind it ?
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It is pretty much accepted to "five side" around a panel or large enclosure to meet the double 5/8" sheetrock requirement, If the wall isn't thick enough to do this, you're out of luck.

Roger
 
no the panel cannot be in that wall, if the panel must go in that wall, go back to the architect or engineer
 
Wall spacing not wide enough.Fire marshall gave that as an option.Or we can mount on outside of wall.Last option is fire rated panel.Building is drywalled and textured and panel wired.No easy way out.Not sure who is paying yet.Its a building passed off onto me from an x employe
 
Jim W in Tampa said:
Why cant it ? There are other 4 square boxes in it with same one layer.
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Jim there is a big difference, and size is it.

From Volume One of the UL Fire Resistance Directory.


WALL AND PARTITION ASSEMBLIES
Metallic Eletrical Outlet Boxes
Listed single and double gang metallic outlet and switch boxes with metallic or nonmetalliccover plates may be used in bearing and nonbearing wood stud and steel stud walls with ratings not exceeding 2h. These walls shall have gypsum wallboard facings similar to those shown in Design Nos. U301,U411, and U425. The metallic outlet or switch boxes shall be securely fastened to the studs and the opening in the wallboard facing shall be cut so that the clearance between the box and the wallboard does not exceed 1/8 in. The surface area of individual metallic outlet or switch boxes shall not exceed 16 sq in. The aggregate surface area of the boxes shall not exceed 100 sq in per 100 sq ft of wall surface.

Metallic boxes located on opposite sides of walls or partitions shall be seperated by a minimum horizontal distance of 24in. This minimum seperation distance between metallic boxes may be reduced when "Wall Opening Protective Materials" (CLIV) are installed according to the requirements of their Classification.

Metallic boxes shall not be installed on opposite side of walls or partitions of staggered stud construction unless "Wall Opening Protective Materials" are installed according to the requirements of their Classification.
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Roger
 
We just had this subject come up today for a heater that could be recess mounted. Everyone had speculations, but no one knew for sure. Thanks for that info Roger.
 
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