h. Cable minimum bend radius and minimum diameter of pulling wheels
used.
i.
Cable jam ratio.
j. Maximum allowable pulling tension on each different type and size
of conductor.
k.
Maximum allowable pulling tension on pulling device.
3.2.2
Duct Line
[Low-voltage cables] [Cables] shall be installed in duct lines where
indicated. [Cable splices in low-voltage cables shall be made in manholes
and handholes only, except as otherwise noted.] [Cable joints in
medium-voltage cables shall be made in manholes or approved pullboxes
only.] Neutral and grounding conductors shall be installed in the same
duct with their associated phase conductors.
3.2.3
Direct-Burial
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NOTE: Specify cover requirements in accordance with
NFPA 70 and IEEE C2. Specify depth of frost line.
Coordinate with UFGS-02300 EARTHWORK for trenching
and backfilling requirements.
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[Medium-voltage cables] [Cables] shall be buried directly in the earth as
indicated. Minimum cover from the top of a cable to finished grade shall
be [_____] mm inches but not less than the depth of the frost line, [_____].
3.2.3.1
Trenching
Trenches for direct-burial cables shall be excavated to depths required to
provide the minimum necessary cable cover. Bottoms of trenches shall be
smooth and free of stones and sharp objects. Where bottoms of trenches
comprise materials other than sand, a 75 mm 3 inch layer of sand shall be
laid first and compacted to approximate densities of surrounding firm soil.
3.2.3.2
Cable Burial
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NOTE: Where soil is known to be rocky, provide
selected backfill for cable protection. Specify
bend radius in accordance with NFPA 70.
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Cables shall be unreeled along the sides of or in trenches and carefully
placed on sand or earth bottoms. Pulling cables into direct-burial
trenches from a fixed reel position will not be permitted, except as
required to pull cables through conduits under paving or railroad tracks.
Where cables cross, a separation of at least 75 mm 3 inches shall be
provided, unless each cable circuit is protected by a nonmetallic conduit
sleeve at the crossing. Where single-conductor cable is installed, all 3
phases and the neutral shall be installed in the same sleeve. Bend radius
of any cable shall be not less than [8] [12] [_____] times the diameter of
the cable. In no case shall cables be left under longitudinal tension.
SECTION 16375A
Page 51
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