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Telecommunications wall fiber optic cable steel strand

Steel messenger strands and lashing wires provide structural support and corrosion protection for fiber optic cables in aerial and wall-mounted installations.

Steel Messenger Strand

A steel messenger strand is a stranded steel cable that supports the weight of fiber optic cables, acting as the primary structural element in aerial or wall-mounted installations. Typically, it consists of six wires wrapped around a central wire, most commonly made of carbon steel with a zinc coating. The zinc coating provides cathodic protection, preventing rust even on cut ends.

For more aggressive environments, such as coastal areas, zinc-aluminum coatings offer higher corrosion resistance and can extend the lifespan of the strand to several decades. Messenger strands are specified by diameter and strength, with options for different coating classes (A, B, C), where higher classes indicate thicker protective coatings. They can support a variety of fiber cables, including loose tube and ribbon cables, and allow for future expansion by lashing additional cables on top of existing ones.

Lashing Wire

Lashing wire is typically stainless steel with diameters ranging from 0. 038" to 0. 045" and is annealed for high ductility with minimum strengths of 70–90 kpsi.

Stainless steel grades are selected based on the weight of the cables and environmental conditions, providing both strength and corrosion resistance. Lashing wire secures fiber cables to the messenger strand, creating a flexible infrastructure that accommodates slack storage, drop cables, and mid-span hardware.

Standards and Specifications

Steel messenger strands and lashing wires adhere to ASTM standards, such as ASTM 475 for metallic-coated steel wire strands and ASTM A228 (music wire) for optical cables. Manufacturers like Bekaert offer customized specifications for strand count, diameter, and minimum breaking strength to meet specific installation requirements. Options include single-strand or multi-strand configurations (3, 7, or 19 wires) and various strength grades, including extra high-strength and utility grades.

Installation Considerations

Messenger strands and lashing wires are installed to support the maximum load allowed by the system, ensuring proper sag and tension. They are compatible with aerial hardware such as brackets, straps, J-hooks, and clamps for pole or wall mounting. Proper selection of strand diameter, coating, and lashing wire grade is critical to ensure long-term durability and safety in different environmental conditions.

Summary

In telecommunications fiber optic installations, steel messenger strands provide the structural backbone, while stainless steel lashing wires secure the cables. Together, they create a durable, flexible, and expandable infrastructure that meets industry standards and withstands environmental challenges.

Telecommunications wall fiber optic cable steel strand

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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