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Hi Alan. The easiest way to do that would be to do a load calculation on what you currently have. You can use my tool here: http://www.wireyourownhouse.com/tools/housecalc.html. That will tell you where you're currently at, then you can see how much space you have left. Keep in mind that even when adding breakers or circuits, you don't just add the amp number of the breakers, they will seldom, if ever, actually draw that much. Just figure the estimated load on the circuits you are adding.
I was ready to get a permit to rewire my upstairs and then I read this: "Please be advised that according to state law, permits and inspections for wiring of single family dwellings are only legally required if a new electrical service is installed."
What constitutes "new electrical service"?
Hi Mark! That's a good question. I haven't seen that wording before, what state are you in? The electrical service consists of the meter, the main panel and the service entrance conductors. It sounds like you are probably just rewiring or installing branch circuits to lights and plugs; if that's the case then, according to that wording, it sounds like you may not need a permit in your area.