Low voltage circuits inside mains conduit
This is a case where what ordinarily would be a Class 2 control circuit is redesignated as a Class 1 control circuit, as per Exception 2 to 725.130(A):


  Exception No.2: Class 2 and Class 3 circuits shall be
  permitted to be reclassified and installed as Class 1 circuits
  if the Class 2 and Class 3 markings required in 725.124 are
  eliminated and the entire circuit is installed using the wiring methods and materials in accordance with Part II,
  Class 1 circuits.


Once that is out of the way, 725.46 applies (allowing the use of Chapter 3 wiring methods as you are doing), but 725.48(B)(1) also applies:


  (1) In a Cable, Enclosure, or Raceway. Class 1 circuits
  and power-supply circuits shall be permitted to occupy the
  same cable, enclosure, or raceway only where the equipment powered is functionally associated.


Considering that you have relay control wiring being run with the circuits they are powering, I do not believe you will have any trouble meeting that requirement.