Answer from Ningbo Changshi: While many tools and principles are similar, there are key differences in equipment design and application for overhead and underground projects.

• Overhead transmission line (OHTL) Tools: The main challenge is managing tension over long, open spans. Hydraulic OHTLstringingequipment.com/Hydraulic-Conductor-Tensioners.html target='_blank'>Tensioners and pullers are used in pairs to precisely control the sag and tension of the conductor. Specialized Stringing Blocks are used to guide the conductor from tower to tower, and anti-twist devices are critical for preventing conductor damage.

• underground cable laying Tools: The primary challenges are friction and navigation through confined spaces. The tools used focus on reducing friction and providing consistent force. This includes a variety of cable rollers (straight line and corner rollers), duct rods, and lubricants. For heavy cables, winches and bullwheel pullers are used to provide the pulling force, and the pulling route is carefully planned to avoid over-tensioning.

Despite these differences, our comprehensive product range covers both applications. For example, our cable pulling socks and Swivels are designed with the versatility to be used in both environments, providing a true one-stop supply solution for all your project needs.