If you want to use 120V and 32V ratings and all three 7½kVA drytypes, it should serve a 240V 3ø load of 234 amperes. Figure E on page 40 of the cited link is probably suitable for the application. It may be a good idea to well mark the 240V panelboard where facility folks are used to finding 208V. It may be a good idea to gut the neutral bus so that someone doesn’t think installing a single pole breaker mistakenly wanting 120V.
http://www.electro-mechanical.com/7700-94.pdf [This message has been edited by Bjarney (edited 08-06-2002).]
