3.1.5.2
Burial Depth
Minimum burial depth for direct burial cable shall be 760 mm 30 inches, but
not less than the depth of the frost line.
3.1.5.3
Direct Burial Cable
Where direct burial cable will pass under sidewalks, roads, or other paved
areas, the cable shall be placed in minimum 25 mm 1 inch zinc coated rigid
steel conduit. Conduit may be installed by jacking or trenching of boring
as approved. When direct burial cable is to be placed in heavy use areas
other than paved areas and where the cable may be subject to damage from
heavy equipment, the cable shall be placed in minimum 25 mm 1 inch rigid
PVC conduit buried a minimum of 1.1 m 42 inches below the surface.
3.1.5.4
Warning Tape
Direct burial cable including cable contained within conduit shall be
placed below a minimum 76.2 mm 3 inch wide plastic warning tape buried in
the same trench or slot. The warning tape shall be 300 mm 12 inches above
the cable. The warning tape shall be continuously imprinted with the words
"WARNING - COMMUNICATION CABLE BELOW" at not more than 1.2 m 48 inch
intervals.
3.1.5.5
Splices
Splices shall be installed in cable splice 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. All 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.
3.1.5.6
Installation in Ducts and Conduits
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 carefully inspected for jacket defects. Precautions shall be
taken during installation to prevent the cable from being "kinked" or
"crushed." 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 all
intermediate manholes. Dynamometers or load-cell instruments shall be used
to ensure that the pulling line tension value and the sidewall pressure
value do not exceed the installation tension value specified by the cable
manufacturer. The mechanical stress placed upon a cable during the
installation shall not be such that the cable is twisted or stretched or
the cable impedance at any point along the length of the cable is altered.
3.1.5.7
Exterior Electrical Work, Aerial
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NOTE: Aerial cable will be installed on existing
poles where height, clearance requirements, and
SECTION 16794A
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