or power conductors or Class 1 circuits shall be in a section permanently separated from such conductors by means of a suitable barrier.
(B) Direct-Buried Cables and Raceways. Direct-buried coaxial cable shall be separated at least 300 mm (12 in.) from conductors of any light or power or Class 1 circuit.
Exception No. 1: Where electric service conductors or coaxial cables are installed in raceways or have metal cable armor.
Exception No. 2: Where electric light or power branch- circuit or feeder conductors or Class 1 circuit conductors are installed in a raceway or in metal-sheathed, metal- clad, or Type UF or Type USE cables; or the coaxial cables have metal cable armor or are installed in a raceway.
820.48 Unlisted Cables Entering Buildings. Unlisted outside plant coaxial cables shall be permitted to be in stalled in locations as described in 820.154(D), where the length of the cable within the building, measured from its point of entrance, does not exceed 15 m (50 ft) and the cable enters the building from the outside and is terminated at a grounding block.
III. Protection
820.93 Grounding of the Outer Conductive Shield of Coaxial Cables. Coaxial cables entering buildings or at- tached to buildings shall comply with 820.93(A) or (B). Where the outer conductive shield of a coaxial cable is grounded, no other protective devices shall be required. For purposes of this section, grounding located at mobile home service equipment located within 9.0 m (30 ft) of the exterior wall of the mobile home it serves, or at a mobile home disconnecting means grounded in accordance with 250.32 and located within 9.0 m (30 ft) of the exterior wall of the mobile home it serves, shall be considered to meet the requirements of this section.
FPN: Selecting a grounding location to achieve the shortest practicable grounding conductor helps limit potential differences between CATV and other metallic systems.
(A) Entering Buildings. In installations where the coaxial cable enters the building, the outer conductive shield shall be grounded in accordance with 820.100. The grounding shall be as close as practicable to the point of entrance.
(B) Terminating Outside of the Building. In installations where the coaxial cable is terminated outside of the building, the outer conductive shield shall be grounded in accordance with 820.100. The grounding shall be as close as practicable to the point of attachment or termination.
(C) Location. Where installed, a listed primary protector shall be applied on each community antenna and radio distribution (CATV) cable external to the premises. The listed primary protector shall be located as close as practicable to the entrance point of the cable on either side or integral to the ground block.
(D) Hazardous (Classified) Locations. Where a primary protector or equipment providing the primary protection function is used, it shall not be located in any hazardous (classified) location as defined in 500.5 or in the vicinity of easily ignitible material.
Exception: As permitted in 501.150, 502.150, and
503.150.