What factors limit the lengths of sag sections in overhead conductors?

The correct answer highlights several critical aspects that affect the design and configuration of overhead conductor installations. Dead-ends refer to points where conductors change direction or terminate, necessitating careful consideration of sag to ensure mechanical stability and proper tension in the system. Angles are significant because when conductors change direction, it can lead to an increased tension and, consequently, affect how much sag is permissible to ensure safety and efficiency.

Structures, such as poles and towers, play a vital role in providing support for overhead conductors, and their design influences the allowable length of sag sections. The terrain also affects sag lengths, as variations in elevation can change the tension and angle at which conductors are strung, requiring adjustments in the sag to maintain safety and reliability.

By concentrating on these variables, engineers can ensure that the conductors are installed correctly while considering the physical and environmental conditions they will face throughout their lifecycle. Thus, the interaction among dead-ends, angles, structures, and the terrain fundamentally shape how sag sections are determined and managed in overhead conductor systems.