d. Splices shall be installed in cable boxes. Sufficient cable shall
be provided in each splicing location to properly rack and splice the
cables, and to provide extra cable for additional splices. Proper
strain relief shall be provided. Cable ends shall be protected at all
times with end caps except during actual splicing. During the splicing
operations, means shall be provided to protect the unspliced portions
of the cable from the intrusion of moisture and other foreign matter.
e. For cable installed in ducts and conduit, a cable feeder guide shall
be used between the cable reel and the face of the duct and conduit to
protect the cable and guide it into the duct and conduit as it is
played off the reel. As the cable is played off the reel, it shall be
inspected for jacket defects. Cable shall not be kinked or crushed
during installation. A pulling eye shall be attached to the cable and
used to pull the cable through the duct and conduit system. Cable
shall be hand fed and guided through each manhole. As the cable is
played off the reel into the cable feeder guide, it shall be
sufficiently lubricated with a type of lubricant recommended by the
cable manufacturer. Where the cable is pulled through a manhole,
additional lubricant shall be applied at intermediate manholes.
Dynamometers or load-cell instruments shall be used to ensure that the
pulling line tension does not exceed the installation tension value
specified by the cable manufacturer. The mechanical stress placed upon
a cable during installation shall not be such that the cable is twisted
or stretched.
3.1.4.2
Aerial
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NOTE: Aerial cable should be installed on existing
poles. Where this is not possible, requirements
must be shown on drawings. Designer must coordinate
with facility personnel for ground clearance and
establish clearances to be shown on drawings.
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Except as otherwise specified, aerial electrical work shall be installed as
specified in Section 16370A ELECTRICAL DISTRIBUTION SYSTEM, AERIAL and as
shown.
a. A messenger cable system to support aerial cable shall be furnished.
The messenger system, including appurtenances, guys and hardware,
shall be capable of withstanding a minimum of 20 kN 4500 pounds of
tension.
b. Transitions from aerial cable to underground cable shall be as
specified for CONNECTIONS BETWEEN AERIAL AND UNDERGROUND SYSTEMS in
Section 16370A ELECTRICAL DISTRIBUTION SYSTEM, AERIAL.
c. Splices in aerial cable shall be within 1 meter 3 feet of a pole and
placed inside a watertight enclosure. Drip loops shall be formed at
the cable entrance to the enclosure. Lashing clamps shall be placed
within 305 mm 12 inches of the enclosure.
d. Lashing wire shall be wound tightly around both the communication
cable and the messenger cable by machine methods. The lashing wire
shall have a minimum of 3 turns per 305 mm linear foot. Lashing clamps
shall be placed at all poles and splices.
SECTION 16798A
Page 15
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