What factors must be considered when determining sag section lengths?

When determining sag section lengths in the context of cable systems, both terrain and wind velocity are crucial factors to consider. Terrain impacts the way sag is distributed along the cable, as different elevations and changes in ground level can influence the tension on the cable and thus its sagging length. For example, if the terrain is uneven, the calculations need to account for how much additional sag might be required to allow for changes in elevation or obstacles.

Wind velocity is another significant factor because it affects the load on the cable due to wind pressure. A strong wind can exert external forces that might increase the tension in the cable, thereby requiring adjustments to the sag length to maintain stability and prevent potential failure. Therefore, both of these environmental considerations are essential to ensuring that the cable operates safely and effectively under varying conditions.

The other factors, while potentially relevant in other contexts, do not capture the full dynamic involved in this specific question about sag section lengths. Temperature can affect material dimensions but is not the primary concern compared to how terrain and wind directly impact tension and stability. Similarly, the material's resistance and the overall weight of the cable are important but they pertain more to the cable's properties rather than the operational environment's influence on sag length.