Steps for laying optical cables using the traction method

Optical cables should be laid by traction using controlled tension, proper swivel devices, and careful handling to prevent twisting, kinking, or exceeding the cable's mechanical limits.

Key Principles for Traction-

Based Cable Laying

Traction Force Limits: The pulling force applied during installation should not exceed 80% of the cable's allowable tension, with the instantaneous maximum force capped at 100% of the allowable tension. This ensures the cable's structural integrity and prevents fiber damage ( ). Use of Swivels: To prevent twisting and torsional stress, a swivel device should be installed between the pulling end and the traction line.

This allows the cable to rotate freely during the pull, reducing the risk of internal fiber damage ( ). Cable Handling and Drum Management: The cable must be released from the top of the drum, maintaining a loose arc without twists. Avoid small loops, surges, or sharp bends.

When laying loops on the ground, use a figure-8 pattern to prevent kinking and twisting, with each loop slightly offset from the previous one ( ). Bend Radius Considerations: Maintain a minimum bending radius of at least 15 times the cable diameter during installation, and 20 times during construction processes. Exceeding this radius can cause compression on the cable core and potential fiber attenuation ( ).

Traction Methods: Depending on the terrain, cable length, and tension requirements, traction can be centralized, intermediate auxiliary, or decentralized. Modern traction equipment often includes automatic tension control, which stops the pull if the force exceeds the set limit ( ). Personnel and Supervision: Cable laying should be closely supervised by trained personnel.

Clear communication and coordination are essential to prevent accidents and ensure proper tension management ( ). Protection During Pulling: Use proper cable grips that secure the jacket and core without crushing the cable. Avoid dragging the cable over sharp edges or uneven surfaces, and ensure conduits or ducts are clean and free of obstructions ( ).

Environmental and Site Preparation: Conduct a site survey to assess soil conditions, obstacles, and conduit accessibility. For underground installations, select appropriate trenching or directional drilling methods, and consider armored or conduit-protected cables in high-risk areas ( ).

Summary

Laying optical cables by traction requires careful attention to tension limits, bend radius, swivel use, and proper drum handling. Following these best practices ensures the cable remains undamaged, maintains signal integrity, and supports long-term network reliability. Proper supervision, planning, and equipment selection are critical for a successful installation.