(2) Horizontal wind pressure [_____] Pa psf
(3) Temperature [_____] degrees C degrees F
(4) Constant to be added to the resultant [_____] N/m lb/ft
bb.
Extreme wind loading:
(1)
Velocity pressure exposure coefficient, wire [_____]
(2)
Basic wind speed [_____] m/s mi/h
(3)
Temperature 15 degrees C 60 degrees F
(4)
Gust response factor, wire [1.0] [_____]
(5)
Importance factor [1.0] [_____]
(6)
Shape factor [1.0] [_____]
3.1.3
Exterior Work Underground
**************************************************************************
NOTE: For UMCS ESS or IDS projects, the designer
will provide transition details in the drawings
based on the details shown in UMCS/EMCS or IDS
Typical Drawings and/or Standards installation
Details.
**************************************************************************
Except as otherwise specified, conduits, ducts, and manholes for
underground FO cable systems shall be installed as specified in Section
16375A ELECTRICAL DISTRIBUTION SYSTEM, UNDERGROUND and as shown.
a. Minimum burial depth for cable shall be 760 mm 30 inches, but not
less than the depth of the frost line. Burial depth specified shall
take precedence over any requirements specified elsewhere.
b. Where direct burial cable will pass under sidewalks, roads, or other
paved areas, the cable shall be placed in a 25 mm 1 inch zinc-coated
rigid coated conduit or larger as required to limit conduit fill to 80
percent or less. Conduit may be installed by jacking or trenching, as
approved.
c. Buried cables shall be placed below a 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 - COMMUNICATIONS CABLE BELOW" at not more than 1.2 m
48 inch intervals. The warning tape shall be acid and alkali resistant
polyethylene film, 76.2 mm 3 inches wide with a minimum thickness of
0.1 mm 0.004 inch. Warning tape shall have a minimum strength of 12066
kPa 1750 psi lengthwise and 10342 kPa 1500 psi crosswise.
d. Transitions from underground cable to aerial cable shall be as
specified in paragraph CONNECTIONS BETWEEN AERIAL AND UNDERGROUND
SYSTEMS in Section 16370A ELECTRICAL DISTRIBUTION SYSTEM, AERIAL and as
shown.
e. For cables installed in ducts and conduit, a cable lubricant
compatible with the cable sheathing material shall be used on all
cables pulled. Pulling fixtures shall be attached to the cable
strength members. If indirect attachments are used, the grip diameter
and length shall be matched to the cable diameter and characteristics.
If an indirect attachment is used on cables having only central
strength members, the pulling forces shall be reduced to ensure that
the fibers are not damaged from forces being transmitted to the
SECTION 16768A
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