How to choose ADSS optical cable based on span and sheath? 3 key decision points

This article analyzes these two core factors from an engineering perspective to help you accurately match project requirements.

1. Span calculation: balancing tension and safety factor

The maximum allowable span of ADSS optical cable depends on:

· Environmental load: local maximum wind speed, ice thickness (refer to IEEE 1138 standard).

· Cable deadweight: cable diameter and structure (such as FRP center reinforcement vs. aramid yarn).

Safety factor: usually ≥3 times the ultimate tensile strength (UTS) to ensure no deformation in extreme weather.

2. Sheath material: balance between weather resistance and anti-tracking

ADSS sheath needs to resist ultraviolet rays, electrical corrosion and temperature difference. Common solutions:

·PE sheath (polyethylene): economical and suitable for dry areas without strong electric field interference.

·AT sheath (anti-tracking polyolefin): added with carbon black, resistant to electrical tracking, recommended for high-voltage transmission lines (>110kV) or high humidity environments.

·Double-layer sheath: PE outer layer + AT inner layer, taking into account both cost and protection level.

Selection principles:

· Voltage level ≤35kV and no ice: PE single layer.

Voltage level ≥110kV or coastal/industrial area: AT sheath.

3. Customized adaptation: avoid "over-design"

·Short span (<100 meters): give priority to lightweight structure (such as small cable diameter) to reduce costs.

·Long span (>300 meters): increase the number of aramid yarn layers or use high modulus FRP to reduce sag.

Conclusion

The span and sheath of ADSS optical cable need to be determined based on field survey data and long-term working conditions. AOPTKE CABLE provides free span calculation tools and sheath selection suggestions. Click here to get the solution.