We use APC AP7911 30amp 220V PDUs in our racks, they cost about $130 used on ebay. Most ATX supplies accept either 110V or 220V in so all you need is the C13 - C14 cables.
The PDU is rated at 24A (12 Amps per bank @ 220V) so you can pull about 5KVA from your 30 Amp L6-30p plug.
Our racks draw about 5Kw for 10Mh in hashing power:
The PDU is rated at 24A (12 Amps per bank @ 220V) so you can pull about 5KVA from your 30 Amp L6-30p plug.
Our racks draw about 5Kw for 10Mh in hashing power:
Bitrocket 5Kw Rack with 30 Amp 220v PDU - 10Mhash