830.47 Underground Network-Powered Broadband Communications Cables Entering Buildings
(A) Underground Systems With Electric Light and Power, Class 1, or Non—Power-Limited Fire Alarm Circuit Conductors
Exception No. 2: Separation shall not be required where electric light or power branch-circuit or feeder conductors, non—power-limited fire alarm circuit 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 network-powered broadband communications cables have metal cable armor or are installed in a raceway.
Exception: A low-power network-powered broadband communications circuit that is equipped with a listed fault protection device, appropriate to the network-powered broadband communications cable used, and located on the network side of the network-powered broadband communications cable being protected.
Table 830.47(C) Network-Powered Broadband Communications Systems Minimum Cover Requirements (Cover is the shortest distance measured between a point on the top surface of any direct-buried cable, conduit, or other raceway and the top surface of finished grade, concrete, or similar cover.)
|Location of Wiring Method or Circuit||Direct Burial Cables||Rigid Metal Conduit (RMC) or Intermediate Metal Conduit (IMC)||Nonmetallic Raceways Listed for Direct Burial; Without Concrete Encasement or Other Approved Raceways|
|All locations not specified below||450||18||150||6||300||12|
|In trench below 50-mm (2-in.) thick concrete or equivalent||300||12||150||6||150||6|
|Under a building (in raceway only)||0||0||0||0||0||0|
|Under minimum of 100-mm (4-in.) thick concrete exterior slab with no vehicular traffic and the slab extending not less than 150 mm (6 in.) beyond the underground installation||300||12||100||4||100||4|
|One- and two-family dwelling driveways and outdoor parking areas and used only for dwelling-related purposes||300||12||300||12||300||12|
|1. Raceways approved for burial only where concrete encased shall require a concrete envelope not less than 50 mm (2 in.) thick.|
|2. Lesser depths shall be permitted where cables rise for terminations or splices or where access is otherwise required.|
|3. Where solid rock is encountered, all wiring shall be installed in metal or nonmetallic raceway permitted for direct burial.|
|The raceways shall be covered by a minimum of 50 mm (2 in.) of concrete extending down to rock.|
|4. Low-power network-powered broadband communications circuits using directly buried community antenna television and radio distribution system coaxial cables that were installed outside and entering buildings prior to January 1, 2000, in accordance with Article 820 shall be permitted where buried to a minimum depth of 300 mm (12 in.).|