Salt is the enemy of every outdoor cable. Coastal environments accelerate jacket tracking, corrode metallic hardware, and reduce the voltage threshold for dry-band arcing. An ADSS cable designed for inland use may fail within 5 years when installed within 5 km of a coastline.
Coastal Design Requirements
- AT jacket at lower voltages: In coastal zones, AT jacket is recommended for 33kV lines — two voltage classes lower than the standard 110kV threshold. Salt contamination dramatically increases surface conductivity.
- Stainless steel hardware only: Galvanized steel corrodes within 3-5 years in coastal salt spray. All clamps, dampers, and brackets must be stainless steel (316 grade minimum).
- Accelerated tracking risk: Salt deposits remain on the jacket surface after evaporation, creating permanent contamination. The tracking risk is continuous, not intermittent. AT jacket with increased thickness (2.0mm+) is standard for coastal ADSS.
Related Reading: Voltage class selection · AT vs PE jacket · Hardware selection
Key Takeaways
- AT jacket required at 33kV+ in coastal zones (vs 110kV inland).
- Stainless steel hardware mandatory — galvanized steel fails in 3-5 years.
- Salt contamination is permanent — tracking risk is continuous, not weather-dependent.
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