Five 30A x 208/240V drops terminating with Nema L6-30r receptacles. Get Some PDUs to plug into those. Save
the last 10A of headroom for some huge ass fans. You'll need them.
Why would you want to use 120V? PC power supplies can run on either. 240V is more efficient, cheaper, and puts less stress/heat on the power supplies.
This is exactly what I was looking for, I think. When you say the pc power supply can be run on 240V, are you talking about using the PDUs that others have suggested or something else? I can't plug them directly in as the plug doesnt fit in the Nema L6-30r.
Most PDU's have either L6-20p cords though you can find them with the C19/C20 or C14/C15 PSU style plugs. You can get L6-30 to L6-20 adapters, but they start around $35-$40 each, so if you're going to have an electrician out, I'd have him install L6-20r recepticles right next to your L6-30r's. Just watch how many amps you put on a circuit at any given time and you'll be fine. That's usually not a big deal as a 30A circuit can safely handle 30x240 (x80% for continuous load safety factor) 5,760w. That would easly handle 5xEVGA 1300G2 PSU's running 15xAntminer S3's.