ADSS cable is strongest in tension — but only up to its specified limit. During installation, the pulling tension at the pulling end can be 2-3× higher than the running tension at the payout end due to friction through sheaves. Exceed the installation tension limit, and you may not see the damage immediately — but the cable’s 25-year life expectancy just got shorter.
Installation vs. Operational Tension
Installation tension limit is typically 25-30% of RTS — significantly lower than MAT (which is for long-term operational loading). The cable experiences dynamic loads during pulling (snatch loads, sheave friction) that are more damaging than static operational loads.
Key Rules
- Maximum pulling tension ≤ 25-30% of RTS during installation. Verify with a tension meter at the pulling end.
- Use a swivel between the pulling line and the cable to prevent twisting.
- For routes longer than 2 km, use intermediate pulling points to reduce accumulated tension.
- Monitor tension continuously — a sudden spike indicates a snag that must be cleared before continuing.
For installation best practices, see live-line installation guide and global installation best practices. For hardware considerations, see ADSS hardware selection.
Key Takeaways
- Installation tension limit is ~25-30% of RTS — much lower than MAT. Exceeding it can damage the aramid yarn or jacket.
- Always use a swivel. Cable twisting during pulling concentrates tension on individual fibers.
- Monitor tension continuously at the pulling end. If it spikes, stop and investigate.
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