W're in the process of adding 4 new rooms to our home. 1 will be a new office, 2 bedrooms, and a game room. Plus we'll be adding some outlets outside the house and some new outside lights as well. No bathrooms will be added. They are finishing up the framing today and I plan to do the electrical myself. I have some experience doing electrical things, I've even added new breakers and and plugs to the box before. but nothing of this magnitude. Here's a picture of my current breaker panel: [IMG]http://farm8.staticflickr.com/7143/6652703483_f812288666.jpg[/IMG] It is a 200-amp main breaker. I also have 5 open sockets on the panel. If I use the regular 15-amp breakers I could get 10 new breakers in there, in theory. However, I was sort of thinking of putting in a dedicated 20-amp breaker for my laser printer in the new office room, since it has been known to trip the regular breaker before. Also, for those scratching their head. The one labeled "EV Charge Port" is one I added and it is a 30-amp 220V breaker for my electric car. (but my Leaf only pulls about half that amperage, I believe) I do not know how many wall-outlets and lights I'm allowed to string together on a single breaker. So I'm wondering if I'm going to have enough power here to do this. Any thoughts, suggestions?

I just installed a bathroom vent fan, and now I'm ready to wire it up. The problem is that I just took the cover off the existing switch (which controls the overhead lights in the bathroom) and there's only 1 piece of 3 wire romex in the box. They've got the black going to the bottom connection on the switch and the white to the top connection. I've never seen a setup like that, and a spot check of a few other outlets in the house makes me think/hope this is the only oddball. My question is, how to proceed? Should I just leave the existing switch as-is and pull 2 new pieces of romex for the fan, or is the existing wiring unsafe? If it's the latter, how do I go about making it safe? Pull a piece of romex for a new line-in, and another piece to go to the fan?