What can be attached to the pulling line to prevent the fiber-optic cable from twisting during installation?

Utilizing a break-away swivel during fiber-optic cable installation is an effective method to prevent the cable from twisting. This device is designed to allow the cable to rotate freely while being pulled, which mitigates the potential for torsion that could lead to fiber damage or performance degradation. By allowing the pulling line to spin independently, the break-away swivel preserves the integrity of the fiber-optic connections throughout the installation process.

The other options do not directly address the issue of twisting in the same way. A friction brake is typically used to control the speed of the cable pull rather than to manage twisting. A tension gauge measures the amount of force being applied during the pull but does not provide a mechanism to prevent twisting. A protective sleeve serves to shield the cable from physical damage but does not address the twisting issue during installation. Therefore, the use of a break-away swivel is the most effective solution for ensuring the proper handling of fiber-optic cables during installation.