Why is it necessary to occasionally re-measure cable heights?

Re-measuring cable heights is essential primarily because cables sag over time due to various factors, including environmental influences such as temperature changes and the weight of the cables themselves. Over time, these stresses can lead to a gradual lowering of the cable's position, which can potentially create hazards if the cable drops to an unsafe height. Regular checks can help ensure that the cables remain at a safe and functional height, thereby preventing any risks to people, vehicles, or equipment that might come into contact with them.

While ensuring safety is indirectly addressed by monitoring sagging, the most specific reason linked to the need for re-measuring is the natural tendency of cables to sag. Additionally, other considerations such as compliance with regulations or checking for fraying do not directly relate to the necessity of periodic height measurements but may be part of a broader maintenance routine.