Besides GFI cirduits wherever there is water or bare concrete, all regular circuits now must have arc-fault breakers. These are very touchy breakers that will pop even if a light bulb flickers. My electrician warned me that these can frustrate when you have to try to find out why it keeps tripping.
Electricity is not something to take "light"ly.(pun intended) Always err on the side of safety and ask a professional.
sean
I really, really dislike those arc-fault interrupters. The ones that I removed wouldn't allow the use of a vaccum cleaner in a couple rooms of the house. Unless they've changed a lot, you'll be pulling your hair out when trying to use an electric motor with them. They will trip if the brushes in the motor arc.
They are mostly combo units out today. AFCI/GFCI. Had a brief chat with one of our electricians today. To run motor or similar loads, you will need the correct breaker. They are generally 3 times more expensive than a standard AFCI/GFCI. 150.00 price range

Ya also have to wire your house correctly. Some common wiring practices, or old wiring will trip these things till you go mad!!!
There is a whole bunch more to this!
Glad I am surrounded by the great group of people I work with! I am just starting to work out the electrical/control scheme for my place, and I got some really crazy stuff I'm planning.
Gonna have to do some tests. My biggest concern for now is how my A-B motor drives will work with these devices.