'02 Code.
230.80
230.90(A) Exception 3.
The service conductors need to be adequate for the calculated load.
But, the combined rating of "up to six service disconnects" is allowed to exceed the SE conductors ampacity as long as any individual disconnect is adequately sized for the load it serves.
Scott,
I'm not sure this is what you're asking, but the NEC Handbook details the principal described above.