So many little issues that are popping up, that honestly as an industrial electrician I haven't given much though of until now. My home will have a firewall 5/8 drywall between the garage and living area. The master bedroom is cantilevered over half of the garage. I was going to surface mount my subpanel on the firewall between and drill through the wall for the feed and also drill holes through it for nmd branch ccts. I am thinking these holes will be in violation, however I doubt the inspector will say anything. What I would like to know is Does anyone mount metal device boxes in the wall or octagons in a firerated ceiling? Or do you surface mount? I have central vac pipes etc that should also go through the wall. If this can not be done this way to code I can mount all of my equipment on an exterior wall however this means many more bends and lengths of conduits for the vacumm and vertical lift etc. Please advise.