Fiber Optic Cable Strapping Method

Proper strapping of fiber optic cables ensures mechanical protection, signal integrity, and long-term reliability in both aerial and indoor installations.

Aerial Cable Strapping

For aerial installations, fiber optic cables are often supported by messenger strands or existing cables. Strapping, or lashing, involves securing the fiber cable to these supports using specialized tools and techniques: Dedicated Messenger Lashing: A fiber optic cable is attached to a strand installed solely for its support. The cable is lashed along the strand using a lashing wire or strap, starting from the far end and moving toward the reel location to maintain tension and alignment.

Overlashing: The fiber cable is lashed over an existing cable, such as a copper or fiber line, using a similar lashing process. This method is useful when adding new fiber to an existing aerial network. Tension and Bend Control: Excessive pulling tension, sharp bends, or crushing forces must be avoided to prevent signal degradation.

Maintain the manufacturer's recommended minimum bend radius and avoid twisting the cable during lashing.

Ground and Indoor Cable Strapping

For indoor or duct installations, proper strapping techniques focus on mechanical protection and organization: Cable Ties and Velcro Straps: Use non-metallic, smooth-edged ties to secure cables to racks, trays, or raceways. Avoid over-tightening, which can crush the cable and damage fibers. Slack Management: Loops of fiber should be formed in figure-8 patterns to prevent twisting and maintain bend radius.

Typical loop sizes range from 2 to 4 meters depending on cable stiffness. Trays and Raceways: Fiber cables should be routed in trays or raceways to protect against mechanical stress, maintain separation from electrical cables, and simplify maintenance.

General Best Practices

Protective Material: Keep protective sheaths in place until installation to prevent damage from sharp edges or environmental exposure. Temperature Considerations: Respect the cable's maximum installation and storage temperatures, especially for LSZH sheathed cables, which are more sensitive to cracking. Labeling and Documentation: Clearly label cables and maintain accurate documentation to facilitate troubleshooting and future upgrades.

Safety: Always wear protective gear, including gloves and eye protection, and follow occupational safety regulations during installation. By following these strapping techniques, fiber optic cables can be installed securely, minimizing mechanical stress and maintaining optimal signal performance over the network's lifetime.