Load diversity

[ChrisS]

I have a machine with 7 D.C. motors 1-17.5 hp and 6- 10 hp the armature of all the motors is varied by one drive and for individual adjustment each motor has a field controller that varies the speed of each motor by a dancer with a potentiometer. My question is when sizing the wire for each of these motors (Table 310.16) do I have to derate the conductors according to Table B.310.11 when according to my thinking there is practically no load diversity. These conductors will all be in the same conduit from the control cabinet to the machine, where at that point I will seperate them out and send them to the indvidual motors.

Thank You for any replys
ChrisS