If the 28 VAC circuit is a class 2 circuit, than 725.139(E) seems to say yes.
(E) Class 2 or Class 3 Cables with Other Circuit Cables.
Jacketed cables of Class 2 or Class 3 circuits shall be permitted
in the same enclosure, cable tray, or raceway with
jacketed cables of any of the following:
(1) Power-limited fire alarm systems in compliance with
Article 760
(2) Nonconductive and conductive optical fiber cables in
compliance with Article 770
(3) Communications circuits in compliance with Article 800
(4) Community antenna television and radio distribution
systems in compliance with Article 820
(5) Low-power, network-powered broadband communications
in compliance with Article 830