Cable twisting during ADSS installation is invisible to the eye — until the damage shows up months later as increased attenuation or aramid yarn fatigue. This guide explains why ADSS cables twist, how to prevent it, and what equipment to use.
Why ADSS Cables Twist During Pulling
When a pulling line rotates under tension — which it naturally does unless controlled — it transfers torque to the cable through the pulling grip. The cable’s aramid yarn layer, designed for longitudinal tension, is not designed to resist torsional stress. Twisting concentrates tension on individual fibers and can permanently deform the loose tube geometry.
Prevention: The Swivel
A pulling swivel placed between the pulling line and the cable grip allows the pulling line to rotate freely without transferring torque to the cable. This is the single most important piece of installation hardware after the cable itself. Two swivels — one at the pulling end and one at the payout end — provide redundancy.
Related Reading: ADSS pulling tension limits · ADSS hardware selection
Payout Best Practices
- Use a payout stand with tension brake — not a free-spinning drum on a bar. The brake prevents the drum from over-running and creating slack loops that can twist.
- The drum axis must be perpendicular to the pulling direction. Angled payout induces twist from the first meter.
- Monitor the cable for figure-8 loops during payout — these indicate twisting and must be cleared before continuing.
Key Takeaways
- A pulling swivel is mandatory. Never pull ADSS cable without one between the pulling line and the cable grip.
- Use a tension-braked payout stand. Free-spinning drums create slack loops that twist.
- Align the drum perpendicular to the pull direction. Angled payout induces twist.
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Frequently Asked Questions
Why does ADSS cable twist during installation?
The pulling line rotates under tension and transfers torque to the cable. Without a swivel, this twist damages the aramid yarn and can permanently deform the cable core.
What equipment prevents ADSS cable twisting?
A pulling swivel between the line and cable grip, a tension-braked payout stand, and sheaves aligned with the pull direction.
