While the fundamental principle of pulling is the same, the machines themselves are optimized for the unique challenges of each environment.

• Overhead Stringing Machines: These are typically puller-OHTLstringingequipment.com/Hydraulic-Conductor-Tensioners.html target='_blank'>Tensioners. They not only pull the pilot rope but are also used to control the tension of the conductor itself as it is strung between towers. They have large, heavy-duty bullwheels and are designed to manage the high tension and long distances required for overhead lines.

• underground Laying Machines: These machines are built for pulling cables through conduits and trenches. Their design often prioritizes features that are critical for underground work, such as self-spooling storage reels and a compact footprint for use in confined spaces. While they may have a lower tension capacity than some overhead machines, they are engineered to handle a higher number of bends and the abrasive conditions of underground installation.

At Ningbo Changshi, we manufacture specialized machines for both applications, ensuring you have the right tool for the job.