galvanized steel pipe straps spaced not more than 3 m 10 feet apart and
with 1 strap not more than 300 mm 12 inches from any bend or termination.
Cable guards shall be secured to poles in accordance with the
manufacturer's published procedures. Conduits shall be equipped with
bushings to protect cables and minimize water entry. Capnut potheads shall
be used to terminate medium-voltage multiple-conductor cable. Cables shall
be supported by devices separate from the conduit or guard, near their
point of exit from the conduit or guard. Pole installation shall be in
accordance with Section 16370A ELECTRICAL DISTRIBUTION SYSTEM, AERIAL.
3.9
CONNECTIONS TO BUILDINGS
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NOTE: Specify a depth below the frost line and
coordinate with UFGS-16402 INTERIOR DISTRIBUTION
SYSTEM. Specify or depict conduit sealing method.
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Cables shall be extended into the various buildings as indicated, and shall
be connected to the first applicable termination point in each building.
Interfacing with building interior conduit systems shall be at conduit
stubouts terminating 1.5 m 5 feet outside of a building and [600] [_____]
mm [2] [_____] feet below finished grade as specified and provided under
Section 16402 INTERIOR DISTRIBUTION SYSTEM. After installation of cables,
conduits shall be sealed [with caulking compound] [_____] to prevent
entrance of moisture or gases into buildings.
3.10
GROUNDING
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NOTE: The designer will specify the grounding
configuration and the number and type of electrodes
required. See TM 5-811-1/AF AFJMAN 32-1080 for
guidance. Coordinate with NFPA 70 and IEEE C2.
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A ground [mat] [ring] consisting of the indicated configuration of bare
copper conductors and driven ground rods shall be installed [under]
[around] pad-mounted equipment as shown. Equipment frames of
metal-enclosed equipment, and other noncurrent-carrying metal parts, such
as cable shields, cable sheaths and armor, and metallic conduit shall be
grounded. At least 2 connections shall be provided from [a transformer,]
[a switchgear ground bus,] [and] [a unit substation] to the ground mat.
Metallic frames and covers of handholes and pull boxes shall be grounded by
use of a braided, copper ground strap with equivalent ampacity of No. 6 AWG.
3.10.1
Grounding Electrodes
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NOTE: Modify and/or delete in accordance with
project requirements.
The designer should investigate the soil resistivity
during the preliminary design phase to determine the
design required to ensure that the grounding values
are obtained. For areas where the water table is
low and/or the soil resistivity is high (such as
volcanic soils, sand, or rock), delete the
additional electrode provisions and provide a design
SECTION 16375A
Page 60
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