How to armor optical cables

Armoring optical cables involves adding protective layers, typically metal or Kevlar, to safeguard fiber optics from mechanical stress, moisture, and environmental hazards.

Understanding Armored Fiber Optic Cables

Armored fiber optic cables are designed with an additional protective layer between the optical fibers and the outer jacket. This armor can be made of stainless steel, corrugated steel tape, steel wire, aluminum, or Kevlar reinforcement, providing resistance to crushing, bending, abrasion, rodents, and moisture . Armored cables are essential in harsh environments such as industrial zones, outdoor installations, underground conduits, or areas with high mechanical stress .

Types of Armored Cables

• Indoor Armored Cables: Resistant to light dust, oil, moisture, and rodent bites, offering flexibility for indoor installations .
• Industrial/Outdoor Armored Cables: Waterproof, abrasion-resistant, and suitable for extreme conditions. They can be directly buried or routed through conduits without additional protection .
• Steel Tape Armor: Ideal for fixed installations, providing strong crush resistance .
• Steel Wire Armor: Suitable for high longitudinal stress scenarios .
• Aluminum Armor: Lightweight and corrosion-resistant, often used where weight is a concern .

Installation Considerations

1. Planning and Preparation: Inspect the cable for damage, confirm cable type (single-mode or multimode), and check the routing path for obstacles, sharp edges, or high-tension areas .
2. Bend Radius and Tensile Load: Armored cables require a larger minimum bend radius than standard fiber. Always check the cable's rated tensile load to avoid fiber breakage during pulling .
3. Pulling Techniques: Avoid pulling directly on the optical fibers. Pull the cable smoothly, preferably from the middle rather than the ends, and avoid twisting or pushing through conduits .
4. Protection of Cable Ends: Cap or tape bare cable ends to prevent moisture ingress, especially for steel-armored cables .
5. Routing: Keep cables away from electrical wiring to prevent interference and avoid areas with excessive heat, sharp edges, or moving machinery .
6. Conduit and Tray Compatibility: Ensure conduits or trays accommodate the armored cable's outer diameter and bend specifications .

Advantages of Armored Cables

Armored optical cables provide enhanced durability, mechanical protection, and longer service life. They reduce the risk of damage from environmental hazards, accidental excavation, or rodent activity, ensuring stable and reliable network performance . By following these guidelines, armored fiber optic cables can be installed safely and effectively, maintaining optimal performance in demanding environments.