I have just experienced the same issue with this type of cable buried in conduits in the ground ... the cable looks ok when you pull it out the conduit ... but once you start stripping th insulation ... its another story ... we talking 2-3 years after installation.
Lesson learnt ... dont bury standard coaxial RJ59 with power in conduits.
I am starting to wonder if we are not going to experience the same issue with cat 5 cable ... I wonder if cat5 or 6 screen would not work better ?
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