Professional Answer (from Ningbo Changshi):

Overhead and underground cable laying equipment are designed for distinct applications and environments. Overhead equipment, such as our hydraulic pullers, OHTLstringingequipment.com/Hydraulic-Conductor-Tensioners.html target='_blank'>Tensioners, and OHTLstringingequipment.com/Stringing-Blocks--Sheaves.html target='_blank'>Stringing Blocks, is built to handle conductors at height, often over long distances. These tools prioritize precision, control, and safety in elevated conditions.

In contrast, underground equipment is engineered for pulling cables through conduits, ducts, and trenches. Our cable drum jacks, winches, and cable rollers are robustly designed to manage the heavy loads and friction associated with underground work while minimizing damage to the cable jacket. The key difference lies in the specialized design to counter gravitational and frictional forces unique to each installation method.