e. 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 300 mm 12 inches of the enclosure.
f. Loops shall be formed in the aerial cables at points of connection
and at poles to prevent damage from thermal stress and wind loading.
The communications cable shall be protected from chafing and physical
damage with the use of spiral cut tubing and PVC tape, or plastic
sleeves. The ground clearance of installed cabling shall be as shown.
g. Cable shall be run vertically and when possible shall use gravity to
assist in cable pulling. Cable shall be pulled from top of run to
bottom of run. Cable shall be hand pull if possible. If machine
assistance is required, tension shall be monitored using dynamometers
or load-cell instruments and shall not exceed specified cable tension
limits. After installation, the vertical tension on the cable shall be
relieved at maximum intervals of 30 meters 100 feet using a split
support grip.
h. 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 1 turn per 380 linear mm1 turn per 15 linear
inches and not less than the number of turns per unit length that is
recommended by the cable manufacturer for the distance between cable
support points and the combined ice and wind loading and extreme wind
loading specified or normally encountered loading for the installed
location. Lashing clamps shall be placed at all poles and splices.
i. Ground conductors shall be soft drawn copper, having a current
capacity of at least 20 percent of that of the messenger to which it is
connected. Ground conductors shall not be smaller than No. 6 AWG. The
ground conductor shall be connected to a copper or copper clad steel
ground rod not less than 19.1 mm 3/4 inch in diameter, and length shall
be as needed to achieve the specified ground resistance. After
installation is completed, the top of the ground rod shall be
approximately 300 mm 1 foot) below finished grade. The ground
conductor shall be protected by half-round wood, plastic, or fiber
molding from the ground to a point at least 2.4 m 8 feet above the
ground. Ground resistance shall be measured in normally dry
conditions, not less than 48 hours after a rainfall, and the total
ground resistance shall not exceed [25] [_____] ohms.
j. Design Parameters
**************************************************************************
NOTE: The designer will include the data listing
the loading conditions, including radial thickness
of ice, horizontal wind pressure, and temperature,
for both combined ice and wind loading and extreme
wind loading encountered at the project site.
**************************************************************************
The ice and wind loading conditions to be encountered at this
installation are as follows:
aa.
Combined ice and wind loading:
(1) Radical thickness of ice [_____] mm in
SECTION 16768A
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