OK guys, here is some background. I am not an electrician but I have completely finished 2 sizable basements in previous homes and did all the electrical by myself following all code guidelines etc. I never had a problem and consider myself pretty good at it.
I have a new house now that is a ranch style with a partially finished basement. I already built my shop in a back corner of the area (about 250 sq feet). When I return home after the Holidays, I am going to expand the shop by about 300 sq feet. I have a full complement of power tools including PM 64a saw, Jet 6" floor jointer, Jet Planer, Delta Drill Press, Jet air filtration, and Jet model 1100 dust collector.
The problem is, the house is brand new and the breaker box is in the garage. There is no way to run new wiring from the box to the basement through walls becase the garage is on a cement slab. The builder did put two 20 amp spare breakers in the box and ran them to a dead outlet in the basement. I used these to power my existing shop space. I used both circuits and powered two outlet boxes with each (for a total of 4 boxes) They were located so that the large tools would be on separate circuits. I expanded the lighting for the new space by tapping into the existing circuit that the other lights in the basement were on (I added 4 porcelain single bulb lights that have 75watt bulbs in them) I also added a small flourescent light over the bench which is plugged into an outlet that screws into the light socket. So... the lights are on a different circuit than the tools.
Now for my question. Is there a way to install a sub panel in the basement. If so how could I run the wiring to the main panel in the garage. Also, to throw another wrench in the equation, as mentioned, the builder put two spare 20 amp breakers in the box but that completely filled the box and there are no unused spaces).
I guess another solution would be to tap into the 20 amp outlets previously wired and add new outlets in the expanded space. I just do not want to overload the breaker obviously. Does running new outlets in itself add to the load or is it only if a tool is running. Also, I am going to need alot more lighting. Should I continue to tap into the overhead light circuit already there???? What is some good lighting that does not take too much ampage??? How can I calculate the appropriate number of lights that can go on a single 15amp breaker.
Long post, I know but any help would be appreciated.
P.S. The talbe saw is not 220. I would like to someday do that but based on what I have explained....I do not know if that is possible.