Laying of armored optical cables

Armored optical cables require careful planning, proper handling, and adherence to installation standards to ensure durability, performance, and safety.

Planning and Preparation

Before installation, inspect the cable for visible damage and confirm the type (single-mode or multimode) and connector specifications . Plan the routing path to avoid sharp edges, high-tension areas, or moving machinery. Ensure conduits, trays, or ducts can accommodate the cable's diameter and minimum bend radius, as armored cables are heavier and stiffer than standard fiber . For outdoor or underground installations, check for water exposure, chemical hazards, and proper drainage .

Tools and Materials

Essential tools include cable pullers, wire mesh pulling grips, swivel connectors, duct rods, and protective caps for cable ends . Use factory or field-installed pulling grips to distribute tension evenly and prevent twisting. Swivels between the pull line and grip are recommended to avoid imparting torque to the cable .

Installation Techniques

1. Pulling the Cable: Never pull directly on the optical fibers. Pull smoothly, avoiding twisting or pushing through conduits. Start pulling from the middle of the cable if possible to reduce stress . Respect the cable's rated tensile load to prevent damage .
2. Bend Management: Maintain the minimum bend radius specified by the manufacturer. Avoid sharp turns, edges, or abrupt direction changes .
3. Figure-8 Loops: When laying cable on the ground, use figure-8 loops to prevent twisting. Each loop should be slightly offset from the previous one, typically 2–4 meters in size depending on cable stiffness .
4. Protection of Cable Ends: Cap or tape exposed cable ends to prevent moisture ingress, especially for outdoor or long-term installations .
5. Routing Considerations: Keep armored cables away from electrical wiring to avoid interference. For underground installations, ensure sufficient burial depth and proper drainage .

Environmental and Safety Considerations

Armored cables are designed to resist crushing, moisture, rodents, and mechanical stress . During installation, avoid excessive heat, sharp objects, and high-traffic areas. Follow local standards such as IEC, NEC, or AS/NZS for compliance and safety . For LSZH armored cables, minimize mechanical stress and avoid high temperatures to prevent cracking .

Testing and Finalization

After installation, clean and test the fibers for signal integrity. Ensure all bends, terminations, and connections meet manufacturer specifications. Proper testing ensures long-term reliability and performance . By following these methods, armored optical cables can be installed safely and efficiently, providing robust protection and reliable performance in demanding environments.