Here's a good thread on electrical:
https://bitcointalk.org/index.php?topic=355305.msg3811413#msg381141330A breaker ------> 10 AWG wiring -------> NEMA L6-30R outlet ------> AP9571 (w/ L6-30P plug).
You now have 5760W of mining power, done right and safe. The PDU gives you 12 outlets so no matter how your rigs are configured you are good to go.
Scroll to the last page or so for a few links to appropriate plugs.