Back tension for the first section is derived from which source?

The correct choice highlights that back tension for the first section is derived from the back tension coming from the cable reel. This is because, during cable installation, the cable reel plays a crucial role in providing the necessary tension to ensure that the cable is fed smoothly without kinks or tangles. Proper tension allows for effective handling and placement of the cable, minimizing the risk of damage during installation.

Deriving back tension from the cable reel is vital for maintaining control over the installation process, ensuring that the cable unwinds correctly and maintains its integrity throughout the installation. Properly tensioned cable from the reel prevents excessive slack, which can lead to difficulties during installation and potential complications later on if the cable is not taut.

Other choices involve aspects that are less directly related to the initial phase of cable pulling. For instance, while resistance in the duct is a factor that affects the overall effort required to pull the cable, it does not directly provide back tension for the first section. Similarly, tension from the pulling equipment is important, but it is not the primary source for the initial back tension. Finally, while the weight of the cable is a consideration in the overall dynamics of cable handling, it does not serve as a source of back tension for the first section of