How to perform ADSS optical cable suspension

ADSS optical cable suspension is performed using suspension and tension clamps to support the cable along poles or towers while minimizing mechanical stress and ensuring proper sag and tension.

Key Components and Hardware

• Suspension Clamps: Used on straight spans to allow the cable to hang freely while reducing bending stress. Typically made of aluminum alloy or anti-UV polymer with protective inlays to prevent abrasion. Suitable for spans from 100 to 600 meters depending on design ( ).
• Tension Clamps (Dead-Ends): Installed at the ends of spans or at points of directional change. They rigidly hold the cable and transfer mechanical loads to poles or towers. Often include preformed helical rods and corrosion-resistant fittings ( ).
• Anchor/Down Lead Clamps: Used for vertical routing along poles, preventing slipping or vibration ( ).
• Tangent Clamps: Hold the cable in the air on short spans (<350 feet) with minimal angle changes, allowing the cable to slip under excessive tension ( ).

Installation Steps

1. Planning and Safety:
   • Assess the route, span lengths, and pole/tower locations.
   • Follow all local, state, and federal safety codes, including the National Electrical Safety Code (NESC) ( ).
   • Ensure personnel are trained in handling fiber optic cables and working at heights.
2. Equipment Setup:
   • Use a stationary reel method for long spans: position the cable reel at one end and a take-up reel at the other.
   • Thread a pull line through travelers and attach the ADSS cable using a woven wire pulling eye ( ).
3. Suspension Clamp Installation:
   • Place the suspension clamp on the pole or tower at the designated location.
   • Insert the cable into the clamp's rubber or polymer insert to evenly distribute pressure and protect the cable jacket ( ).
   • Ensure the cable hangs freely without tension along straight spans.
4. Tension Clamp Installation:
   • Install at the end of spans or at directional changes.
   • Secure the cable using preformed rods and fittings to transfer mechanical loads to the structure.
   • Verify that the cable is properly tensioned according to sag/tension tables ( ).
5. Intermediate Supports:
   • Use tangent or suspension clamps at intermediate poles to guide the cable gently and prevent excessive bending or vibration ( ).
6. Final Checks:
   • Confirm proper sag, tension, and alignment.
   • Inspect clamps for secure attachment and ensure no damage to the cable jacket.
   • Verify compliance with voltage exposure limits if installed near high-voltage lines ( ).

Best Practices

• Avoid sharp bends and excessive tension to prevent fiber damage.
• Use preformed clamps to reduce installation time and improve durability.
• Maintain a minimum of three structures before the first large angle change to ensure smooth cable routing ( ).
• Consider environmental factors such as wind, ice, and UV exposure when selecting hardware ( ). By following these steps and using the appropriate clamps and hardware, ADSS optical cables can be safely suspended with minimal mechanical stress, ensuring long-term performance and reliability.