Not sure about UV ratings or wet environment applications to the example given with an AC unit, but it would seem to apply in some way. But then we could have an entire lengthy separate post / comment thread about the difference between best practice, industry standards, NEC compliance, and what really happens in the field...
With respect to this business of zip-tying Low Voltage to refrigeration lines or the power feed flexible conduit, I would think there may be issues to the whole business of Low Voltage being required to be properly fixed to the building. For example it seems Low Voltage can not be zip-tied to the exterior of conduit or suspended ceiling suppport wires inside the building, so why would it suddenly be OK outside?
We might want to follow this:
http://ecmweb.com/nec/whats_wrong_here/whats_wrong_000409/index1.html
