If I was having security system trouble as a result of water getting through a zone cable sheath, how would it show itself?
A: Water damage to wiring is much more common that you’d think. As water penetrates the sheath what you’re going to get first is noise on the wire indicating high frequency leakage between the conductors.
Water conducts electricity a whole lot better than PVC, remember. You’ll also get greater impedance (this may not be measurable, even on an oscilloscope) and the level of isolation will fall. As the copper corrodes you’ll get increasing resistance and a lot more noise. In the end you’ll get false alarms.
We’d recommend using a gel-filled cable for wet runs like this. If you need to re-install the job as a result of water damage, invest in this cable type – it won’t let you down.
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