I use 10 amp rated C13 to C14's, and run them to APC power distribution units, which have a C14 plug for the receptacle and a NEMA 6L30 locking plug for the 230v incoming.

Of course I'm a stickler for cable management. A 3 prong regular dryer outlet will work fine. You only need single phase 230v, not 3 phase 240v.