Armored Optical Cable Fixing Method

Armored optical cables are fixed using specialized clamps, metal hoops, and sealing devices to secure the armored layer and fiber core, ensuring stability and protection against mechanical stress.

Key Principles of Fixing Armored Optical Cables

Armored fiber optic cables are reinforced with steel, Kevlar, or aluminum layers to resist crushing, bending, and environmental hazards . Proper fixing ensures that the cable remains stable, prevents slippage, and maintains signal integrity. The fixing method typically involves:

1. Cable Preparation
   • Inspect the cable for damage or deformation.
   • Strip the outer jacket carefully to expose the armored layer and fiber core without nicking the fibers .
   • Reserve sufficient slack (1–2 meters) for maintenance or repair.
2. Clamping the Armored Layer
   • Use metal hoops or squashes to secure the armored layer and steel core .
   • In closures or manholes, loosen the armored layer slightly to insert it into the clamp, then tighten bolts to achieve a firm hold.
   • Select sealing gaskets according to cable diameter to ensure proper compression and protection.
3. Using Specialized Fixing Devices
   • For submarine or high-stress installations, Haff-type cover plates or sector-distributed steel wire guide channels can be used to lock the cable firmly in place, preventing uneven friction and slippage .
   • Base plates and cover plates are fixed with fasteners to secure the cable in manholes or landing points.
4. Sealing and Protection
   • Ensure that the fixing method maintains IP68-level sealing in closures to prevent water ingress and environmental damage .
   • Compressed blocks or sealing gaskets are used to maintain a tight seal around the armored layer and fiber core.
5. Routing and Bend Radius Considerations
   • Maintain the minimum bend radius for armored cables, which is larger than standard fiber, to avoid microbends or signal loss .
   • Ensure the path is free of sharp edges and high-tension points.

Practical Tips

• Always use tools compatible with armored cables, such as strippers, clamps, and torque-controlled fasteners.
• Avoid over-tightening, which can damage the fiber core.
• For outdoor or submarine installations, consider environmental factors like water, rodents, and mechanical stress when selecting fixing devices.
• Document the installation and slack lengths for future maintenance. By following these methods, armored optical cables can be securely fixed, minimizing the risk of slippage, mechanical damage, and signal degradation, ensuring long-term reliability in harsh environments .