When pulling optical fiber cable, which material can be used as the pull line?

When pulling optical fiber cable, which material can be used as the pull line?

• A. Aramid yarn
• B. Nylon rope
• C. Steel cable
• D. Polyester thread

Answer: (A)

Pull lines for optical fiber must handle the pulling force without stretching or damaging the cable, while remaining smooth and easy to control through conduits. Aramid yarn, such as Kevlar, provides very high tensile strength with minimal elongation under load, so tension stays consistent during the pull and the risk of the fiber being stressed is minimized. It’s also abrasion-resistant and lightweight, which helps prevent damage to the cable surface as it passes through rough or tight passages. In contrast, nylon rope tends to stretch under load, changing tension and increasing the chance of fiber stress; steel cable is strong but heavy and rigid, can nick or crush the cable, and is impractical to maneuver; polyester thread is typically not strong enough to safely pull long runs. So aramid yarn is the best choice because it combines high strength with very low stretch and good abrasion resistance.

Pull lines for optical fiber must handle the pulling force without stretching or damaging the cable, while remaining smooth and easy to control through conduits. Aramid yarn, such as Kevlar, provides very high tensile strength with minimal elongation under load, so tension stays consistent during the pull and the risk of the fiber being stressed is minimized. It’s also abrasion-resistant and lightweight, which helps prevent damage to the cable surface as it passes through rough or tight passages. In contrast, nylon rope tends to stretch under load, changing tension and increasing the chance of fiber stress; steel cable is strong but heavy and rigid, can nick or crush the cable, and is impractical to maneuver; polyester thread is typically not strong enough to safely pull long runs. So aramid yarn is the best choice because it combines high strength with very low stretch and good abrasion resistance.