Paul I am not sure that there are 240 volt servers, but I do know that there are 208 volt servers, hubs, switches, all the same stuff that normally is 120 volt.
At least I hope they where rated 208 because that is what the plans show for feeds.
A pretty common outlet I install in data centers is a NEMA L6-30R (Locking 250 Volt 30 amp rated) single phase grounding receptacle.
[This message has been edited by iwire (edited 08-20-2003).]