Power line sag is the downward curve or droop of an overhead conductor between two support structures (utility poles or towers) . This sag is a natural and necessary result of a conductor's weight, tension, and environmental factors such as temperature, wind, and ice. Sag increases with higher temperatures and can decrease with colder temperatures.

Because clearance is measured from the lowest point of the conductor's sag, a conductor's sag must be carefully calculated and controlled to ensure minimum clearance requirements are met at all times. Our comprehensive range of overhead line stringing equipment, including OHTLstringingequipment.com/Hydraulic-Conductor-Tensioners.html target='_blank'>Tensioners and pullers, is specifically engineered to achieve the correct tension and sag, ensuring that conductors are installed in full compliance with all safety and clearance regulations.