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above finished grade The protection required need not exceed 18 in below finished grade Conductors entering buildings must be protected to the point of entrance Underground service conductors not encased in concrete that are buried at least 18 in below grade must have their location identified by a warning ribbon that is placed in the trench at least 12 in above the conductors Conductors and cables subject to damage must be installed in approved metal or nonmetallic conduit Listing: Cables and insulated conductors installed in enclosures or raceways in underground installations must be approved for wet locations Figure 4-8 is a cross-sectional view of a trench with two direct-burial cables installed
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NEC 2002, Table 3005, defines five different types of buried cable and wiring situations:
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Figure 4-8 Section view of a trench containing direct-burial cables in nonresidential areas
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SUBSTATIONS AND ELECTRICAL DISTRIBUTION
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Direct-burial cables or conductors Rigid or intermediate metal conduit Nonmetallic raceways for direct burial without concrete encasement Residential branch circuits rated 120 V or less with GFCI and overcurrent protection Low-voltage circuits for irrigation or lighting
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The table also gives seven different locations of wiring or circuits, of which five are
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In a trench under a 2-in concrete slab Under a building Under a concrete slab at least 4 in thick Under streets, highways, roads, alleys, driveways, and parking lots Under residential driveways
In general, burial depths range from a 4 in for all categories under 4-in-thick concrete slabs to 24 in for direct-burial cable in unspecified locations For example, direct-burial cables and conductors must be buried at least 18 in deep under residential driveways, but GFCI- and overcurrent-protected 120-V or less residential branch circuits must be buried at least 12 in After the trench is dug deeper than the minimum depth requirements, a 3- to 4-in bed of sand should be placed at the bottom of the trench to protect the cable from sharp stones that might still be at the bottom of the trench The cable or cables should then be placed in the trench without crossovers and slightly snaked, to allow enough slack for earth settlement, movement, or heaving due to frost action Single conductor cables should be kept uniformly apart by about 6 in along the length of the trench After the cable is laid in the trench, another 3-in layer of sand or sifted backfill should cover the cables Then a treated wooden plank or concrete slab, wide enough to cover the cables, should be placed over them to protect the cables from any future excavations The trench is then backfilled another 12 in (if depth permits) A colored plastic ribbon should then be placed in the trench before completing the backfilling, to warn future excavators that electrical conductors are buried underneath
MANHOLES
A cross-sectional view of a typical electrical manhole is shown in Fig 4-9 The base ring or square is positioned at the bottom of the excavation, and the conical or pyramidal throat is placed on top of the base with its opening at ground or finished-grade level Manholes are sized to provide enough room for installers and maintenance personnel to splice cables or mount equipment as well as carry out routine inspections There are rules for dimension of access openings and other features of electrical manholes
I Round access: If the manhole is round and it contains only power cables, the diam-
eter must not be less than 26 in
I Round access: If the manhole is round and it contains a fixed ladder that does not
obstruct the opening or it contains optical fiber cables, fire alarm circuits, or remote control or signaling circuits, the diameter must not be less than 24 in
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UNDERGROUND DISTRIBUTION CABLES
Figure 4-9
Section view of a typical power cable manhole
I Rectangular access: If the opening in the manhole is rectangular, it must not be less
than 26
22 in
I Slope: The slope of the sidewalls must be sufficient to provide protection for cable
splices or other installed equipment so they will not be directly under the opening
I Drain: The drain must be located centrally under the opening I Traps: Where water drainage will go into sewers, suitable traps or other means must
be provided to prevent the entry of sewer gas into the manhole Manholes for underground electrical distribution are separated by distances in an underground duct system that are short enough to permit pulling conductors or cables between them during initial construction They also permit access to the conductors or cables for testing, cable replacement, and maintenance Access to manholes is gained through openings or throats extending from the manhole cavity to the surface (ground level or finished grade) At ground level a heavy, durable manhole cover is used to close the manhole securely Underground cable runs normally terminate inside a manhole, where there is sufficient room for them to be spliced to another length of cable Manholes can be constructed manually from bricks and mortar, but today most of them are prefabricated from reinforced concrete in two parts: a base ring or base square section and a conical or pyramidal throat There are three basic designs for electrical/communications manholes: two-way, three-way, and four-way
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