OPTICAL GROUND WIRE (OPGW) CENTRAL FIBER OPTIC UNIT DESIGN


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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