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Tension of ordinary optical cables

Tension of ordinary optical cables

The maximum pulling tension for most optical fiber cables during installation is typically around 600 pounds (2,700 Newtons), while long-term operating tension should be kept well below this value.Installation TensionDuring installation, optical fiber cables are subjected to short-term stresses from pulling through ducts, around bends, or from back tension on reels. The installation tensile strength represents the maximum load a cable can safely withstand without damaging the fibers or affecting optical performance. For most outdoor loose tube or ribbon cables, this value is generally 600 pounds (2,700 N), though it can vary depending on cable construction and manufacturer specifications (Prysmian, OCC) . To prevent damage:Pull the cable steadily and continuously; never jerk or push it .Use proper cable grips and swivels to avoid twisting .Maintain the minimum bend radius, typically 20 times the cable diameter during installation .Long-Term or Operating TensionAfter installation, the cable is subjected to long-term tensile loads, which are lower than installation tension. These loads account for the cable's weight, environmental factors, and support intervals. The residual tension should remain below the manufacturer's recommended long-term load, and vertical installations should include frequent clamping to prevent excessive stress from the cable's own weight .Additional ConsiderationsAerial installations: Tension must account for sag, wind, and ice loading. Calculations often follow NESC guidelines to ensure the cable is not overstressed under environmental conditions .Crush and bend: Avoid short-term loads exceeding 125 lbf per linear inch and maintain proper bend radius to prevent fiber deformation or attenuation increases .Cable type: Different constructions (loose tube, ribbon, ADSS) have varying tensile strengths; always consult the specific cable data sheet .SummaryMaximum installation tension: ~600 lbf (2,700 N)Long-term operating tension: Significantly lower than installation tension, as specified by the manufacturerBest practices: Steady pulling, proper grips, swivels, adherence to bend radius, and frequent clamping for vertical runs Following these guidelines ensures the optical fibers remain intact, maintain low attenuation, and provide reliable long-term performance.

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