3.1.4
Exterior Work
3.1.4.1
Underground
Except as otherwise specified, underground electrical work shall be
installed as specified in Section 16375A ELECTRICAL DISTRIBUTION SYSTEM,
UNDERGROUND and as shown.
a.
Where direct burial cable will pass under sidewalks, roads, or
other paved areas, the cable shall be placed in minimum 25 mm 1
inch rigid galvanized steel conduit. Conduit may be installed by
jacking or trenching, 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 schedule
80, buried a minimum of 1067 mm 42 inches below the surface.
b.
Direct burial cable shall be placed below a minimum 75 mm 3 inch
wide plastic warning tape buried in the same trench or slot. The
tape shall be 305 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 meter 4
foot intervals.
c.
Transitions from underground cable to aerial cable shall be as
specified for CONNECTIONS BETWEEN AERIAL AND UNDERGROUND SYSTEMS
in Section 16375A ELECTRICAL DISTRIBUTION SYSTEM, UNDERGROUND.
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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SECTION 16797A
Page 17
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