What quota should be used for flexible suspension of optical fiber cables
The maximum installation tensile load for most aerial fiber optic cables is typically around 2670 N (600 lbf), with support intervals and sag determined by cable type and environmental conditions.
Maximum Tensile Load
For aerial fiber optic cables, the standard installation tensile rating is generally 2670 N (600 lbf) unless using micro-cables or All-Dielectric Self-Supporting (ADSS) cables, which may have lower stress requirements . During installation, the residual tension on the cable should remain below this maximum to prevent fiber damage . Pulling should be done on the cable's strength members only, and proper tension control devices or breakaway pulling eyes are recommended for long runs .
Support Intervals and Sag
Flexible suspension requires careful attention to clamping intervals to prevent excessive sag and movement. Vertical or aerial installations should have clamps spaced frequently enough to support the cable weight and prevent exceeding the long-term load rating . For ADSS cables, manufacturers provide sag and tension tables based on span length, wind, and ice loading, which should be used to determine the proper suspension points . A typical minimum ground clearance is 4.7 m (15.5 feet) under loaded conditions.
Bend Radius Considerations
During suspension, the minimum bend radius must be maintained to avoid fiber breakage. This radius is specified by the cable manufacturer and may vary for loaded and unloaded conditions . Coiling or wrapping the cable is permissible as long as the bend radius is not violated .
Practical Recommendations
- Use frequent clamps to prevent cable movement and sag.
- Monitor tension during installation to stay below the maximum load.
- Avoid twisting or pushing the cable; always pull straight along the path.
- For long spans, consult manufacturer-provided sag and tension tables to ensure safe suspension.
- Consider environmental factors such as wind, ice, and temperature, which affect sag and tension. By following these guidelines, flexible suspension of optical fiber cables can be performed safely, ensuring long-term reliability and compliance with industry standards .
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