Fire rated walls

Status
Not open for further replies.
They need to be fastened directly to a framing member such as a stud. No clips are permitted to secure the box directly to the drywall.
 
As Infinity states, the boxes must be attached to a framing member or to the structure, so the short answer is, OW boxes will not work with OW mounting/installation methods.

Roger
 
Fire rated walls

infinity said:
They need to be fastened directly to a framing member such as a stud. No clips are permitted to secure the box directly to the drywall.
Click to expand...

What is the code article that covers this,I always thought you could not OW boxes for this app.
But can't find the violation.
Geo
 
It's not in the NEC but you can find it in the UL Orange books.


From 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.
Click to expand...

Roger
 
roger said:
It's not in the NEC but you can find it in the UL Orange books.




Roger
Click to expand...

To expound on your comment Roger, the Building Codes will regulate the requirements for membrane penetrations in fire rate walls, one of the ways to comply with the requirements from the Building Code is to use UL tested assemblies which come from the UL Orange books.

There are some prescriptive measures right from the IBC Chapter 7

Chris
 
Status
Not open for further replies.
Top