I read/heard somewhere that 20A is pretty standard per circuit in the US, Don't quote me on it, I would like a definite answer as well.
Also, have you preordered it yet? I'm trying to preorder it and the website is saying they don't ship to the US. I'm not able to complete the checkout due to the shipping address I entered.
Yes 20 is common, 15 is also common. Most electricians will run 20amp outlet circuits, however some jobs are done on the cheap and will only have 15amp. Keep in mind that even thought the circuit is rated at 20 amp the receptacles are usually not.
This is a 15 amp receptacle
http://thumbs.dreamstime.com/x/electric-outlet-wall-socket-plug-receptacle-7529752.jpgThis is a 20 amp receptacle
http://images.meredith.com/diy/images/2009/03/p_SCW_104_03.jpgAlso most residential homes don't have 208v dual phase. they have 240v split phase
