I'm a bit lost... I see everyone with their massive setups of multiple units, etc etc. When a standard outlet would seemingly barely power 2 rigs... assuming not everyone is running in a warehouse with dedicated lines, how is everyone doing this? Or am I missing something.
Welcome to reality - homes are not data centers... Modern mining for profit requires running your operation like a business investment which often requires scaling infrastructure. (Electrical, mechanical and if needed cooling.) Not everyone operates warehouse data-centers, but I'm pretty sure the biggest players all do, and i think it's approaching the point soon where large scale will be the only way to make it profitable as hash competition is pretty fierce and only growing as these ASIC's come online.
And whatever you do, do NOT do as one guy suggested and increase the amperage of your breakers unless you KNOW FOR SURE that the wires coming out of the breaker will not overheat and light your house on fire under the increased load. If you aren't sure of what what I'm talking about, then hire an electrician okay? (smile) Wires that are too small for the current you wish to consume get hot, melt the insulation and then get dangerous. Breakers are designed to stop this, and a breaker upgrade often requires the output wires to be re-pulled with thicker copper to ensure that the breaker pops before the wires get hot. In that order.
Good luck and be safe.