Talk to a electrician, They will not recommend doing this but you can however wire your normal 110v wall outlets for 220v.

you can also try finding a standard outlet Nema 5-15r that is rated for 220. that would be a safer option.

Either way your still be getting the added Voltage bonus and you wont have to buy some special adapter to plug the psus in.

If you want to get really serious about mining in your house, you should get another breaker panel. 100 or 200Amp will suffice. Have the ELectrician wire it for 208volt 3Phase. you will basically have a 3 pull breaker that can take 30 amps on each pole. 24Amps as you should technically follow the 80% capacity rule. youll be able to get around 5-6 s7's on each phase this way.

My setup is in a datacenter so power is not an issue. but here is how ours is. 208volt 3 phase- Nema l21-30 Receptacles- 3 Phase 30Amp Pdu's

The Pdus can rather expensive if your buying brand new, i would recommend finding a high capacity pdu used from ebay and then going from there. 

hope this helps shed a little light.

Thanks, Keegan