What device can be attached to a pulling line to avoid twisting the fiber-optic cable during installation?

The best choice for avoiding twisting of fiber-optic cable during installation is a break-away swivel. This device allows the pulling line to rotate independently from the fiber-optic cable. As the cable is pulled through conduits or other tight spaces, the swivel enables free movement, reducing the risk of the cable twisting, which can damage the delicate fibers inside.

Having a break-away feature also provides an added safety mechanism. If excessive force is applied during the installation, the swivel can disconnect, preventing further damage to either the cable or the pulling apparatus. This makes it especially useful in environments where tight turns or friction might cause problems.

While a tension gauge, cable grip, and pull tape all serve important roles in the installation process, they do not specifically address the issue of preventing twisting in the same way that a break-away swivel does. A tension gauge measures the force being applied, a cable grip is designed to securely hold the cable during pulling, and a pull tape assists in guiding the cable through conduit. None of these directly resolve the twisting concern, which is why the break-away swivel is the correct answer.