At what point do sagging operations begin during the installation process?

Sagging operations begin after the conductor stringing is completed because, at this stage, the conductors are in place but not yet tensioned. Sagging refers to the process of adjusting the tension in the conductors to ensure they are correctly set between the supporting structures, such as towers or poles. This step is crucial for maintaining the desired clearance off the ground and ensuring proper electrical and mechanical performance under various environmental conditions. The sagging procedure ensures that the conductors are properly tensioned, which helps prevent issues like excessive swaying or electrical interference during operation.

The moment conductor stringing is finalized is critical because it allows for the accurate measurement and adjustment of sag, which cannot be executed properly if the conductors are not yet installed. This is why the stage of stringing must be completed prior to sagging, making this answer the most appropriate choice.