rescapt has an excellent point—given a typical “firehouse” 250A-frame molded-case breaker here out west, the 2x350kcmil/ø callout looks like trouble. An example might be www.cutler-hammer.eaton.com/unsecure/cms1/SD29120J.PDF
pg.7 allows 1x350kcmil cable/ø, and 2AWG maximum for the stock multiconductor terminal. [That may be slightly complicated in that they’re service-entrance conductors?] It is possible details in drawing “Note 5” cover this, but I'd be asking the local engineering consultant who did the drawings. Cut-in may have been sorta’ glazed over for the bidding contractor(s) to work out at their own expense and coordination effort.
[This message has been edited by Bjarney (edited 01-24-2003).]