having a coefficient of friction sufficiently low to allow the fiber free
movement.
a. The cable outer jacket shall be medium density polyethylene material
with orange pigment added for ease of identification.
b. Tensile strength: Cables shall withstand an installation tensile
load of not less than 2700 Newtons 608 pounds and not less than 600
Newtons 135 pounds continuous tensile load.
c. Impact and Crush resistance: The cables shall withstand an impact
of 3 Newton-meters 1.7 lbs/in as a minimum, and shall have a crush
resistance of 220 Newtons per square centimeter 317 psi as a minimum.
2.16.2.3
Direct Burial Cable
The optical fibers shall be surrounded by a tube buffer, shall be contained
in a channel or otherwise loosely packaged to provide clearance between the
fibers and inside of the container, and shall be extruded from a material
having a coefficient of friction sufficiently low to allow the fiber free
movement.
a. The cable outer jacket shall be medium density polyethylene material
containing at least 2.6 percent carbon black with only black pigment
added for additional coloring.
b. Tensile strength: Cables shall withstand an installation tensile
load of not less than 2700 Newtons 608 pounds and not less than 600
Newtons 135 pounds continuous tensile load.
c. Impact and Crush resistance: The cables shall withstand an impact
of 3 Newton-meters 1.7 lbs/in as a minimum, and shall have a crush
resistance of 220 Newtons per square centimeter 317 psi as a minimum.
d. Direct burial cable shall be protected with plastic coated steel
armor. The plastic coated steel armor shall be applied longitudinally
directly over an inner jacket and have an overlap of 5 mm 0.20 inch
minimum. Armoring materials shall provide corrosion protection from
local environmental/soil conditions over the projected life of the
cable.
2.16.3
Interior Cable
a. Loose buffer tube cable construction shall be such that the optical
fibers shall be surrounded by a tube buffer, and shall be contained in
a channel or otherwise loosely packaged to provide clearance between
the fibers and the inside of the container to allow for thermal
expansions without constraining the fiber. The protective container
shall be extruded from a material having a coefficient of friction
sufficiently low to allow the fiber free movement. The cable outer
jacket shall be fluorocopolymer (FCP), which complies with NFPA 70 for
optical fiber nonconductive plenum (OFNP) applications. Manufacturers'
recommended values for tensile strength, impact resistance, and crush
resistance shall not be exceeded. Interior cables' insulation and
jacketing material shall not contain any poly vinyl chloride (PVC)
compounds.
b. Tight buffer tube cable construction shall be extrusion of plastic
over each cladded fiber, with an outer jacket of FCP, which complies
SECTION 16768A
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