How about running only two legs of 277/480 plus PE to 3 parrallel 3 phase 50 A pin and sleeve receptacles? All of the devices intended to be plugged in, are single phase welders. I believe the breaker is either a 3 pole 30A or 50A. Commercial establishment.
Larry C
Edit to add last two words.
[This message has been edited by LarryC (edited 03-05-2007).]
