Overview Moisture build up will affect critical electrical characteristics of an unprotected underground cable. A UV resistant black polyethylene sheath ensures protection against environmental degradation. The addition of gel filling provides protection from water ingress protecting the core from corrosion and water travelling down the inside of the jacket to the outlet in the event that the cable is breached. Only water blocked cables are allowed to be installed underground enforced by the Australian Communications Authority Wiring Rules, AS/ACIF S009, effective from 1 January 2004.
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