conductors, non-power-limited fire alarm circuit conductors, or Class J 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.
(C) Mechanical Protection. Direct-buried cable, conduit, or other raceways shall be installed to meet the minimum cover requirements of Table 830.47. In addition, direct-buried cables emerging from the ground shall be protected by enclosures, raceways, or other approved means extending from the minimum cover distance required by Table 830.47 below grade to a point at least 2.5 m (8 ft) above finished grade. In no case shall the protection be required to exceed 450 mm (18 in.) below finished grade. Type BMU and BLU direct- buried cables emerging from the ground shall be installed in rigid metal conduit, intermediate metal conduit, rigid nonmetallic conduit, or other approved means extending from the minimum cover distance required by Table
830.47 below grade to the point of entrance.
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.
(D) Pools. Cables located under the pool or within the area extending 1.5 m (5 ft) horizontally from the inside wall of the pool shall meet those clearances and requirements specified in 680.10.
III. Protection
830.90 Primary Electrical Protection.
(A) Application. Primary electrical protection shall be provided on all network-powered broadband communications conductors that are neither grounded nor interrupted and are run partly or entirely in aerial cable not confined within a block. Also, primary
electrical protection shall be provided on all aerial or underground network-powered broadband communications conductors that are neither grounded nor interrupted and are located within the block
containing the building served so as to be exposed to lightning or accidental contact with electric light or power conductors operating at over 300 volts to ground.
Table 830.47 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.)
Nonmetallic Raceways
Listed for Direct Burial; Rigid Metal Conduit Without Concrete
or Intermediate Encasement or Other
Location of Direct Burial Cables Metal Conduit Approved Raceways
Wiring Method
or Circuit mm in. mm in. mm in.
All locations not specified below 450 18 150 6 300 12
In trench below 50-mm (2-in.) thick 300 12 150 6 150 6 concrete or equivalent
Under a building (in raceway only) 0 0 0 0 0 0
Under minimum of 100-mm (4-in.) thick 300 12 100 4 100 4 concrete exterior slab with no vehicular traffic and
the slab extending not less than 150 mm (6 in.) beyond the underground installation One- and two- family dwelling driveways and outdoor parking
areas and used only for dwelling-related purposes
Notes:
300 12 300
12 300 12
1. Raceways approved for burial only