What is the minimum distance between supports for "free air" low voltage cabling. There is no cable tray. I will have to hang some hooks to support the cable. This is in UT

You may review the NEC at:

NFPA 70: National Electrical Code®

You have a great deal of reading to do, as you need to find the type cables or system your installing and review the appropriate Article.

If this is your trade, should you not know this already?