Designing an ADSS route on an existing transmission line is more complex than a new build — the towers are fixed and the cable must fit within their constraints.
Phase 1: Tower Loading
Assess every tower: structural capacity, attachment point availability, ground clearance.
Phase 2: Span Profile
A 400m flat span is very different from a 400m valley crossing. Valley crossings increase wind speed 20-40%. Mountain passes change ice loading. See extreme weather design.
Phase 3: Cable Segmentation
Drums hold 6-8 km of 48-core ADSS. Plan splices at accessible towers. For logistics, see lead time guide. For tension design, see MAT calculation and sag and tension guide.
Key Takeaways
- Assess every tower’s loading before specifying cable.
- Valley crossings and mountain passes require different loading than flat terrain.
- Plan splices at accessible towers — never mid-span.
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