Neutral-less panels are as common as dust in industrial settings. These are designed to fit within the 'web' of a vertical I beam/ column. Since such panels are also very, very, likely to feed 3-phase loads, the neutral doesn't get a lot of action, anyway.
You'll find them listed in Square D catalogs.
They are frowned upon elsewhere. The operative assumption being that subsequent players are going to be so stupid as to not correctly land neutral conductors. The 'savings' from omission of a neutral path into the adjacent panel are insignificant.
I must be a rare electrician, I've never seen the set-up described. I don't work the heavy industrial side of the street.
Last edited by Tesla; 03/20/13 10:50 PM.