Communications wiring and Power wiring are not permitted in the same raceway I don't care what the insulation ratings are. Article 800 Section 800.133 NFPA70 2005 Edition.
Here we go with terminology.
CAN bus is normally used for interconnecting automation devices which is is probably a 725 remote-control and signalling application. 725.55(D) and 725.55(E) have provisions for mixing Class 2 and Class 3 circuits with other wiring.
Article 800 is for "central station systems" like telephones. However, 830 address networks so 830.133(A)(1)(d) Excpt #1 may be applicable.