How does tension change when a line is sagged versus when it is taut?

• A. Taut lines exert less tension
• B. Sagged lines have no tension
• C. Sagging increases tension at corners
• D. Both exert equal tension

Answer: (C)

When a line is sagged, such as in the case of a power line or a cable that is not pulled tight, the tension experienced at corners or points of support actually increases due to the weight of the line and environmental factors like wind or ice. The sagging creates a vertical component of force that increases the overall tension in the system, particularly at points where the line turns or changes direction. This increase in tension at the corners is essential in maintaining the structural integrity of the line and ensuring that it can bear the weight and forces applied to it.

In contrast, when a line is taut, all of the force is distributed evenly along its length without any sagging, leading to a lower overall tension compared to a sagging line facing similar loads. Taut lines can handle less environmental weight impacts since they are held tightly in place, thus experiencing less stress at support points than sagged lines.

Understanding this distinction is crucial for anyone involved in line construction or maintenance, as improper tension management can lead to line failure or safety hazards.