Answer from Ningbo Changshi: This is a common and important question. While both tools guide cables, their applications are distinct.

• A cable sheave, also known as a stringing block, is a specialized pulley designed to support and guide a cable, rope, or conductor during the installation of overhead transmission lines or for vertical pulls. Sheaves are used to change the direction of a pull, lift a conductor into position, or guide it over obstacles. They are critical for overhead stringing as they reduce friction and ensure the conductor is not damaged by sharp bends or contact with the tower structure.

• A cable roller, on the other hand, is designed for underground or ground-level use. It is typically a drum or series of drums on a frame that helps to roll cables along a trench or duct run. Rollers are used to support the cable's weight and minimize friction as it's pulled horizontally.

In short, use a sheave for overhead or vertical work to change direction, and use a roller for horizontal, ground-level pulls to support the cable's path. At Ningbo Changshi, we manufacture both to the highest standards, ensuring you have the right tool for every project.