Is bending too sharply during installation the only way an air void can be created in an underground cable?

Bending too sharply during installation can indeed contribute to the formation of air voids in underground cables, but it is not the only way this can occur.

Air voids can also be created due to improper handling of the cable, such as inadequate installation techniques, failure to maintain proper tension while installing the cable, or if the cable is placed in a manner that leads to the accumulation of air pockets. For example, if the trench is not filled properly after laying the cable, or if the cable is subjected to movement or settling after installation, air gaps can form.

Additionally, factors such as the type of installation environment and the quality of materials used can also play a role in creating air voids. Therefore, it's critical for linemen to understand that multiple factors can lead to air voids, not just sharp bends in the cable. Proper installation practices are essential to avoid air voids and ensure the longevity and efficiency of the cable system.