I have laid out my plan for outlet locations and wire routes, as well as lighting fixtures, but I am running into a question that is difficult to get an answer for. If anyone can help, I would appreciate it.
I wish to install a surface mount subpanel on the wall that separates my attached garage from my house. I know that it is important to maintain the integrity of this 'modified 1-hr firewall'. That being said, my house seems to be a little unique in a couple of respects so I want to throw this out there to anyone who might have some insight.
The wall separating my garage from my house is, as far as I know, up to code (with the exception of a rather large hole the previous homeowners drilled in it for a dryer vent-- which I am planning on repairing). My basement wall (standard concrete block foundation) makes up the lower half of this wall... To better explain, the wall that separates my house from my garage is concrete block up to waist level, and up-to-code 1-hr modified firewall from waist level on up to the roof.
I have pored over the NEC handbook and can not find any reference to whether or not what I want to do is 'legal' and I want to have some guidance before I submit my plans to the electrical inspector. The only reference to any of this I found was in building code, and it was vague at best (subpanels shall not penetrate 1hr wall). So, now that you know the background info, here are my string of questions:
1. Is it 'up-to-code' to install a surface mount subpanel on the wall separating my attached garage from my house?
2. Knowing that it is not allowed to penetrate the firewall itself, is it up to code to run the feeder cable for the panel through the waist-level concrete block wall, or is that also considered part of the modified 1hr wall?
3. If 1 and 2 are OK, is it ok to run the feeder cable up along the side and then through the top of the surface mounted box to attach to the main lugs?
4. If I am going down the wrong track completely, can someone please tell me a best-practices method for running feeder cable through or around a firewall from a basement to a garage?
Any help or insight anyone can provide would be greatly appreciated.