Which method is regarded as the best for sagging messenger/strand cables?

The dynamometer method is regarded as the best for sagging messenger or strand cables because it provides a precise measurement of tension in the cable, ensuring that the sag is within safe and functional limits. This technique allows linemen to accurately gauge the weight and tension on the cables, which is crucial for maintaining performance and safety standards in overhead line construction and maintenance.

Using a dynamometer enables the lineman to adjust the sag effectively, reducing the risk of issues that can arise from inadequate or excessive sag. Since sag affects the cable's tension, an accurate reading can help in calculating the right sag that accommodates environmental factors and mechanical stresses without compromising the integrity of the installation. This method is also beneficial because it enables real-time adjustments based on measurable data.

Other methods may lack the precision needed to ensure that cables are sagged correctly. For instance, certain alternative methods might lead to assumptions based on visual estimations or may not cater to the specific tension requirements, which could result in issues later on, like excessive wear on the cables or safety hazards. Thus, leveraging the dynamometer ensures that the results align with industry standards and best practices for cable installation.