Ked, the other day you posted the following:

NEC prohibits installing any below 50 v. wiring in conduit with 120 v. or higher wiring, but you did not want to do that anyway.
I asked you to please cite the NEC Article where this prohibition appears. Since you have not returned to the forum since I made that request I decided to post this as a new topic so my question would not get lost in the other topic.

I am quite aware of several provisions that must be followed when circuits of different voltages are in the same raceway but I am not familiar with any prohibition such as you wrote.