Why is the U-Shaped Installation Method for OPGW Cable Slack Storage Becoming More Common?
The U-shaped installation method for is a newly developed installation practice. It helps reduce installation difficulty, significantly improves the pass rate of Cable Slack Storage installation, enhances the overall appearance of the splice box tower configuration, and effectively avoids interference with tower-climbing work during routine line maintenance. In addition, it greatly reduces torsional stress at the end of , thereby preventing water or air leakage caused by long-term twisting force.
Why Can U-Shaped Cable Slack Storage Installation Improve the Pass Rate?
Common issues with traditional Cable Slack Storage racks include: cable winding, crossing, insufficient bending radius, friction against tower steel, torsion applied to the splice box, and interference with maintenance tower climbing.
In contrast, the advantages of U-shaped Cable Slack Storage installation are mainly reflected in the following aspects:
Installation difficulty is greatly reduced due to a clear and straightforward routing path.
Clamp placement follows a regular and standardized pattern.
Cable crossing and stress superposition are avoided, preventing overlapping tension buildup.
not less than 4, improving stability and control.
, reducing interference with step bolts and improving safety for maintenance personnel.
U-shaped downlead routing + fixation at key points, torsion on the splice box can be significantly reduced, lowering the risk of leakage.
U-shaped downlead (cables from different circuits/lines must not cross each other).
1.5 to 2 meters along the downlead route.
permitted.
10 to 15 meters.
on the tower. A downlead clamp or parallel groove clamp shall be installed 50 cm below the splice box to fix two OPGW cables, so as to prevent torsion.
Non-uniform clamp spacing
, especially at tower-top turning points where hard bends are most likely to occur
: wind-induced movement can damage the outer layer within half a year
: long-term stress on sealing surfaces increases the risk of water/air leakage
: makes future re-splicing impossible
: maintenance becomes messier over time and may introduce micro-bending loss
Is the U-shaped installation suitable for all tower types?
Tower structure (angle-steel tower / tubular steel tower / compact tower)
Why is the clamp spacing required to be 1.5–2 m? Can it be larger?
A larger spacing is not recommended. Excessive spacing may cause:
How to control the bending radius for U-shaped downlead routing?
it is better to make the route "more rounded" than to create any hard bends.
A larger bending radius is always safer, especially near the tower-top downlead point where sufficient space must be reserved
Why install a clamp/parallel groove clamp 50 cm below the splice box?
anti-torsion structure. Adding a fixation point below the splice box works like a "rotation stopper," significantly reducing:
Long-term pulling stress on the splice box caused by the cable's self-weight