The central fiber optic unit shall be
designed to house and protect the optical fibers from damage due to
forces such as crushing, bending, twisting, tensile stress, and
moisture.
The fiber optic unit and the outer
stranded metallic conductors shall serve together as an integral unit
to protect the optical fibers from degradation due to vibration and
galloping, wind and ice loadings, wide temperature variations,
lightning and fault current, as well as environmental effects that
may produce hydrogen.
The fiber optic unit may include an
aluminum tube and/or channeled aluminum rod, but is not limited
to these designs.
Aluminum tube
The fiber optic unit may include an
aluminum tube to house the fibers. The aluminum tube may be
fabricated as a seamless extruded tube, seam welded, or a tube
without a welded seam.
Aluminum rod
An aluminum rod may be fabricated with
one or more channels or grooves and formed into a helix to house the
optical fibers.
An outer protective shield may be
applied around the rod such as an aluminum tube or a helically
applied overlapping aluminum tape to provide an additional mechanical
and environmental barrier.
Filling compound
If required, the interstices of the
fiber optic unit shall be filled with a suitable compound to prohibit
any moisture ingress from outside or any water migration along the
fiber optic unit.
The filling compound used shall be
compatible with all the components it may come in contact with and
shall absorb and/or inhibit generation of hydrogen within the cable.
Central structural member(s)
Structural member(s) may be used to
limit the stress on the fiber inside the central fiber optical unit.The central fiber optic unit shall be
designed to house and protect the optical fibers from damage due to
forces such as crushing, bending, twisting, tensile stress, and
moisture.
The fiber optic unit and the outer
stranded metallic conductors shall serve together as an integral unit
to protect the optical fibers from degradation due to vibration and
galloping, wind and ice loadings, wide temperature variations,
lightning and fault current, as well as environmental effects that
may produce hydrogen.
The fiber optic unit may include an
aluminum tube and/or channeled aluminum rod, but is not limited
to these designs.
Aluminum tube
The fiber optic unit may include an
aluminum tube to house the fibers. The aluminum tube may be
fabricated as a seamless extruded tube, seam welded, or a tube
without a welded seam.
Aluminum rod
An aluminum rod may be fabricated with
one or more channels or grooves and formed into a helix to house the
optical fibers.
An outer protective shield may be
applied around the rod such as an aluminum tube or a helically
applied overlapping aluminum tape to provide an additional mechanical
and environmental barrier.
Filling compound
If required, the interstices of the
fiber optic unit shall be filled with a suitable compound to prohibit
any moisture ingress from outside or any water migration along the
fiber optic unit.
The filling compound used shall be
compatible with all the components it may come in contact with and
shall absorb and/or inhibit generation of hydrogen within the cable.
Central structural member(s)
Structural member(s) may be used to
limit the stress on the fiber inside the central fiber optical unit.
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