Bolt-type Tension Clamp Selection: Stop Line Slippage In NLD/NLL Series
Selecting the Right Dead End Strain Clamp
Use an NLD or NLL bolt-type tension clamp. These fittings mechanically anchor overhead conductors to distribution towers, maintaining precise line tension without damaging the aluminum strands.
Why Mechanical Security Fails: The NLD/NLL Solution
Power distribution networks face constant environmental mechanical stress. Selecting an incorrect dead end strain clamp leads to conductor slippage, resulting in costly power outages and line repair overheads.
Technical Specifications
The NLD and NLL series utilize high-strength malleable iron or aluminum alloy bodies to match standard wire diameters. The table below outlines standard mechanical ratings.
| Model Number | Conductor Range (mm) | Rated Failure Load (kN) | U-Bolt Quantity |
|---|---|---|---|
| NLL-1 | 5.4 - 11.4 | 20 | 2 |
| NLL-2 | 11.5 - 16.0 | 30 | 3 |
| NLD-2 | 11.5 - 17.5 | 40 | 3 |
Three Steps to Ensure a Secure Connection
Improper installation of a bolted type strain clamp reduces holding efficiency and compromises the physical holding power. Field teams should follow this sequence to avoid localized overheating:
-
Clean the Wire: Remove aluminum oxide layers from the conductor surface before placement.
-
Apply Liners: Utilize aluminum liners on small-section wires to distribute the mechanical load evenly.
-
Torque Evenly: Tighten the nuts in a diagonal sequence to prevent localized crushing forces.
Long-Term Reliability Benefits
Integrating a robust bolted dead end clamp into distribution lines limits sagging over time. The heavy-duty design prevents structural distortion during extreme wind or ice loads, ensuring continuous electrical conductivity across the entire grid span.
