||11-30-2007 03:23 PM
Garage Sub-Panel Firestop
I am in the process of adding a 60amp sub-panel to my attached garage, so I can run a couple power tools and dust collection simultaneously without worrying about tripping the single 20amp circuit that currently powers my single garage outlet and two exterior outlets. Plus, my wife wants a couple more outdoor outlets for future seasonal decoration. I'd like to install it this weekend, but before I start, I have a couple questions regarding fireproofing the panel and it's surrounding area. I tried calling the local inspector, who helped me in the past, but he isn't available right now, and the person who I did talk to wasn't helpful at all. Basically, I want to flush mount the panel in the common wall between the garage and the house. I know I'm going to have to do build some sort of firestop, but I don't know exactly what code requires. My wall is built like this:
1/2" sheetrock | Interior 2x6 wall | OSB sheathing | Exterior 2x4 wall | 5/8" sheetrock
My first question is, with the OSB separating the interior and exterior walls, do I need to add any sort of firestop other than high heat silicone at the conduit entrance point? My next question is, assuming a firestop is required, can I just line the stud bay with 5/8" sheetrock on back, top and bottom, giving an extra 12" on top and bottom of the panel for a workspace? If that's not acceptable, what is? If it makes a difference, my township is currently using the 2002 NEC, but will be adopting 2005 at the beginning of the year. I should have everything done before then, but if there's a huge change in '05 that I need to consider, I haven't done anything yet, so my plans can easily be changed. For the time being, I'll start cutting and gluing conduit and get it as close as I can. Thanks in advance for any suggestions.