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Fiber optic cable tension section

Fiber optic cable tension section

Fiber optic cable tension section - MADIBA BAY OPTICS

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The tension section of a fiber optic cable refers to the cable's ability to withstand pulling forces during installation and long-term loads without damaging the fibers.

Maximum Pulling Tension

Fiber optic cables are sensitive to excessive pulling, bending, and crushing forces, which can permanently damage the fibers and require replacement of the cable section. For example, stranded loose tube and ribbon cables typically have a maximum pulling tension of 600 lbF (2,700 Newtons) during installation, but the exact value depends on the cable type and manufacturer specifications, so always consult the cable specification sheet before installation (Corning) . Outdoor cables often have a strength rating of at least 2,700 N, and the residual tension after installation should be below this long-term load limit (Belden) .

Cable Construction and Strength Members

Fiber optic cables include strength members such as aramid yarn, steel wires, or central strength rods to handle tensile forces. Loose tube cables, commonly used for outside plant installations, protect fibers under high pulling tension and can be installed in conduits, aerially, or buried directly. The strength members carry the mechanical load, preventing stress on the delicate fibers themselves .

Installation Considerations

  • Bend Radius: During installation, the cable must not be bent below the minimum working bend radius, typically 15 times the cable diameter for Corning cables. After installation, the minimum installed bend radius is usually smaller but must still be respected to avoid fiber damage .
  • Vertical Installations: For vertical runs, cables should be clamped at frequent intervals to prevent the cable weight from exceeding the maximum recommended long-term load .
  • Handling: Use figure-eight configurations when unreeled to prevent kinking or twisting, and avoid coiling in a continuous direction for lengths over 30 meters .

Summary

The tension section of a fiber optic cable is critical for ensuring the fibers remain undamaged during installation and throughout the cable's service life. Proper attention to maximum pulling tension, strength members, bend radius, and clamping intervals ensures reliable performance and longevity of the fiber optic network .

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