Steel wire rope for laying optical fiber cables

Galvanized or stainless steel wire ropes with appropriate diameter and tensile strength are commonly used to support and pull optical fiber cables safely.

Types of Wire Rope for Fiber Optics

For optical fiber cable installation, wire ropes are typically made of galvanized steel or stainless steel to resist corrosion and provide high tensile strength. Common constructions include 6x19, 6x37, 7x7, and 7x19, where the first number indicates the number of strands and the second the number of wires per strand. Fiber core or IWRC (Independent Wire Rope Core) options are available, with fiber core providing flexibility and IWRC offering higher strength.

Diameter and Strength Considerations

Wire rope diameters for fiber optic applications usually range from 3mm to 8mm, depending on the cable weight and span length. The tensile strength must not exceed the maximum pulling load of the fiber cable, which is often reinforced with Kevlar or fiberglass rods. Using a rope with insufficient strength can lead to sagging or breakage, while excessive tension can damage the fiber.

Accessories and Installation Tools

Cable grips: Dual weave galvanized wire rope grips are used to attach the fiber cable to the pulling rope for overhead or underground installation. Tension clamps: Stainless steel clamps with wedges or nylon bodies secure the cable to the wire rope, increasing friction and preventing slippage. Thimbles, clips, and turnbuckles: These accessories help anchor, secure, and adjust tension along the installation path.

Installation Guidelines

Always pull on the cable's strength members, not the fiber itself, to avoid breakage. Maintain the minimum bend radius and avoid twisting the cable during installation. Use lubricants compatible with the cable jacket for long runs.

For long spans, consider automated pullers with tension control or breakaway pulling eyes to prevent overloading. Monitor the supply reel and communicate along the installation path to prevent cable jumping or damage.

Summary

For laying optical fiber cables, choose a galvanized or stainless steel wire rope with suitable diameter and tensile strength, use proper cable grips and tension clamps, and follow best practices for pulling and supporting the cable. This ensures safe, efficient installation while protecting the fiber from mechanical stress and environmental exposure.