If I recall, there is the notion of "protecting from physical abrasion or damage" or something like that, I'm wondering at what point normal landscaping / groundskeeping activities, moving water hoses around in the gardens, etc, could become a potential "cause" for the need to protect these wires in some fashion? Especially the ones zip-tied to suction line insulation that at some point degrades and leaves the wires hanging loose...
But if the low voltages on the conductors are by design (as bounded by the NEC requirements and UL type listings) not capable to ignite or cause physical electric shock, perhaps under the NEC there just isn't any concern for "loss of AC" by damage to the wire?
