Thanks for posting my question, Joe; and also to those providing insight.
The wireway in question is a UL approved 12"x12" B-Line that has small conductors (#6 to #1), and about 5 to 10% fill with 30 cables. B-Line makes UL approved dividers, so it would appear that placing more than 30 CCC in a large wireway is acceptable practice. Granted, dividing a wireway is most often done for separating power cables from Class II circuits.
I wonder how the somewhat arbitrary "no more than 30 current carrying conductors" limit was arrived at (regardless of wireway size), in light of the Canadian code limitation provided by Tony of up to 200 CCC!
Stephen J. Smith
Intel Electrical Proj Engr