I was changing a light fixture and obviously did something wrong because when I flipped the breaker back on, heard a small pop and now everything that was on that breaker no longer works. I tried waiting for it to cool down over night and flipped it back on, and it still won't work. I opened up the panel looking for a main shutoff switch or something and can't find it. Searched the entire house and only found a main shutoff with 2 fuses but believe this is specific to my A/C unit as pulling it out didn't turn off any electricity and it's near where the A/C unit is, see pictures below. What should I do? Any advice would be greatly appreciated. Thanks, Mark [ATTACH]51766[/ATTACH] [ATTACH]51767[/ATTACH]

I'm not an electrician, so the best possible fix is to hire a professional electrician. That being said, I found this problem in the middle of an insulation/sheetrock project that has just about sunk us, and I can't possibly afford to hire an electrician. Our upstairs (where the children sleep) breaker box is fed by 10/3 wire that runs directly to the service connection in the top of our main breaker box downstairs. The 10/3 is actually in the same posts as the massive black service cables in the top of the box. It runs upstairs to a small breaker box where is is connected to a 100A "Main" breaker. My concern is that the 10G wire can't handle the potential current in normal use, much less in a dead-short situation. Running new wire would be very difficult, most likely requiring me to break brick because it runs between the original exterior and the new brick. What I'm hoping is that the 10/3 can actually handle the current that may be used upstairs with just 2 bedrooms and no bathrooms or major appliances, and that I can drop the line in my main breaker box down to a breaker instead of the service connections. It sounds safe to me, but again I'm not an electrician. My first concern is running from one breaker to another isn't something I have seen done before. Also, I don't know how to calculate the breaker size I would need for that. As simple as the sum of all the breakers used in the upstairs box? Probably not. Main Breaker box (the 10G in the top runs to the upstairs breaker box) [ATTACH]51973[/ATTACH] Upstairs Breaker Box (Note the 2 30A breakers aren't used even though they are on and have always been on. And yes that is a galvanized nut on top of the breakers. It was in there when I opened the box.) [ATTACH]51974[/ATTACH] Any help you guys can offer is appreciated. Thanks