What is the size of the steel strand in an overhead optical cable
Steel strands in overhead optical cables typically consist of 6 wires wrapped around a central wire, with diameters ranging from approximately 0.038" to 0.045" for lashing wires, and larger for messenger strands depending on load requirements.
Construction and Configuration
The steel messenger strand that supports aerial fiber optic cables is usually made of six outer wires twisted around a central core wire, forming a strong, flexible strand suitable for overhead installation . The most common material is carbon steel, often with a zinc coating to provide corrosion protection. For more aggressive environments, zinc-aluminum coatings are used to extend the lifespan of the strand . Lashing wires, which secure the fiber cable to the messenger strand, are typically stainless steel with diameters ranging from 0.038" to 0.045". These wires are annealed for high ductility and have minimum tensile strengths of 70 to 90 kpsi, depending on the stainless steel grade and environmental conditions .
Diameter and Strength Considerations
The overall diameter of the steel strand varies based on the number of wires, wire gauge, and intended load. For example, extra high-strength guy strands used in overhead structures can have larger diameters and are twisted from multiple wires to provide additional tensile strength and stability . The diameter and coating class (Class A, B, or C) determine both the mechanical strength and corrosion resistance of the strand .
Summary
- Messenger strand: 6 wires around a central wire, carbon steel, zinc or zinc-aluminum coated, diameter depends on load.
- Lashing wire: Stainless steel, 0.038"–0.045" diameter, tensile strength 70–90 kpsi.
- Coating: Zinc for general use, zinc-aluminum for harsh environments.
- Purpose: Supports and secures overhead optical cables, providing mechanical strength and corrosion resistance . This configuration ensures that overhead optical cables are mechanically stable, corrosion-resistant, and capable of supporting the cable weight over long spans.
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