Are there specific additional requirements for residential underground coaxial cable installation?
Yes, along with the grounding requirements of the NEC, Part 3 of the NESC has additional Safety Rules for Underground Lines. a. Underground service where the CATV cable is installed in metallic conduit in contact with the earth for ten or more feet may use the conduit as a grounding electrode; however, the metallic cable sheath must be bonded to the conduit and to the customer’s electrical service grounding system. b. Underground service where the CATV cable is of the direct burial type or where the conduit used is non-metallic, the CATV cable must be grounded at the nearest point to building entry. c. Where trunk and/or feeder cables are installed to joint trenches, i.e., telephone and power, CATV cable must be bonded to power grounds where power grounds exist and each power supply location. The installation must comply with applicable NEC Code provisions. d. Where trunk and/or feeder cables are buried separate from utilities, the system must be grounded utilizing No. 6 AWG copper gro
