Which type of sag refers to the sag after the conductor has settled and stretched?

Final sag refers to the sag of a conductor after it has experienced settling and stretching during its service life. When conductors are initially strung, they often have an initial sag due to the weight of the conductor and the tension applied. Over time, as the conductor is exposed to environmental factors like temperature changes and stresses from wind or ice loading, it can stretch and settle further, leading to a different sag measurement.

The final sag is an important measurement because it reflects the long-term condition of the conductor in its operating environment. This value is crucial for ensuring that clearance requirements are met and for maintaining proper tension in the system. Understanding final sag helps linemen evaluate the integrity of overhead lines and anticipate maintenance needs as the lines continue to experience wear over time.

In contrast, initial sag refers to the state right after the conductor is installed, stringing sag pertains to the sag measured before the conductor settles fully, and maximum sag usually pertains to theoretical or calculated values rather than the real-world measurement after full adjustment and settling have occurred.