Answer from Ningbo Changshi: While the fundamental purpose of a Swivel is the same—to prevent twisting—the designs are often optimized for different environments.

• underground cable laying: Swivels for underground applications, such as pulling through ducts or manholes, are typically streamlined and have a smooth "bull-nose" shape. This design minimizes the risk of snagging on rough conduit edges or getting caught in tight bends.

• Overhead transmission line (OHTL) Stringing: Swivels for overhead work must be robust enough to handle the unique challenges of tension stringing. They are designed to withstand high radial loads as they pass over OHTLstringingequipment.com/Stringing-Blocks--Sheaves.html target='_blank'>Stringing Blocks and pulley systems. The design ensures the swivel remains stable and rotates freely even when the pulling line or conductor is at an angle.

At Ningbo Changshi, we manufacture a wide range of swivels engineered for both environments, ensuring our clients have the right tool for their specific project needs, whether they are pulling cable through a duct or stringing a conductor on a towering pylon.