If you are feeding a single circuit breaker than I'd agree with your approach. On the other hand, if you are supplying more than one main and you did say "CB's" then the smaller conductors are okay as long as they will handle the load based on the calculations in Article 220. I base this statment on what it says in Article 230.90(A) Exception #3.
I might add, I don't understand your reference to using triplex if conduit is being used??
[This message has been edited by George Little (edited 11-24-2005).]
