I'm about to spend a bunch of cash in an area that I'm not familiar with. I've done a bunch of research and would like your help. I'll donate 5 BTC to whoever can confirm my approach or suggest a better solution.
I will be running 9 mining rigs each with 4x7970s pulling just about 1150 watts each via two 750 Watt Power supplies. I've calculated that at 208 Volts that each machine will pull 5.53 amps or 49.76 amps to support all 9 machines.
I've been fortunate enough to get a lease that includes electricity and A/C. The office suite comes with a NEMA 10-50 Socket 50 Amps @ 250V. I've contracted an electrician to replace the outdated NEMA Socket with a CA STD CS8265C (California Style 50 Amp, 250 Volt, 3 wire Twistlock Plug). That will allow me to use the Geist ZP090-105C19CS6 50 Amp PDU (
http://www.stayonline.com/detail.aspx?ID=13298). I will then use C20 to 2 Way C13 cord (
http://www.stayonline.com/detail.aspx?ID=18940) to plug in each of the powers supplies (two to each rig).
It's going to run me $919 for the PDU/Power cords and about $400 for the electrician to change out the power socket. Is this the best way to go or is there a better option?