http://i.imgur.com/ScnV58o.jpgHere is my ant miner collection, there are 3 more running in another location, but you should be able to count 20 in the picture, which brings the total to 23!
This is a residential location? You must be pulling about 7000kwh+, did you have to have an electrician come out to your place to configure that amount of power draw?
Yessir, have 3 20A lines, one for each tower of them.