In relation to power lines, what does the term "sag" refer to?

The term "sag" in the context of power lines refers to the downward curve that occurs due to the weight of the conductor and the tension acting on it. Over long spans between poles, gravity pulls the cables down, causing them to sag at their lowest point. This sag is a crucial aspect of power line installation and maintenance.

Understanding sag is important because it directly affects the clearance of the line above the ground and any obstacles, ensuring safety standards are met. Additionally, the sag tension impacts the electrical flow and helps to prevent the line from snapping due to excess weight or tension, especially in adverse weather conditions. Proper management of sag helps maintain the structural integrity and functional reliability of the power distribution system.