Technical Specifications
NX Wedge Cable Clamp
| Item | Specification |
| Model | NX-2 |
| Conductor Cross-section | 50–70 |
| Nominal breaking load (kN) | 88 |
| Material | hot-dip galvanized, stainless steel |
| Model | Applicable strand | Main dimensions (mm) | Nominal breaking load (kN) | ||||
| section (mm²) | Outside diameter (mm) | C | M | L | R | ||
| NX-1 | 25–35 | Φ6.6–7.8 | 18 | 16 | 150 | 6 | 45 |
| NX-2 | 50–70 | Φ9.0–11.0 | 20 | 18 | 180 | 7.3 | 88 |
| NX-3 | 100–125 | Φ13.0–14.0 | 24 | 24 | 200 | 7.3 | 143 |
| NX-4 | 135–150 | Φ15.0–16.0 | 28 | 27 | 220 | 8 | 164 |
Product introduction
The NX Wedge Cable Clamp is a traditional fastener used to secure steel strands (overhead ground wires and guy wires) in power lines.
It is widely used on tension towers, angle towers, and terminal towers in distribution and transmission lines.
Materials and Manufacturing Process
1. Core Materials: The body and wedge are made of malleable cast iron, offering high strength and good toughness; The fasteners are made of Grade 8.8 hot-dip galvanized carbon steel, providing anti-loosening and anti-corrosion properties; the insulating cover is made of silicone rubber, offering weather-resistant insulation.
2. Manufacturing Process: The body and wedge are precision cast and undergo stress-relief treatment to eliminate internal stresses; contact surfaces are precision machined and galvanized to enhance corrosion resistance.
Product Features
Self-Tightening Structure: Utilizes a wedge locking principle. When the conductor is under force, the wedge and the strand slide simultaneously along the clamp cylinder wall towards the outlet, tightening gradually until a locking state is achieved, exhibiting self-tightening characteristics.
Superior Material:The clamp body and wedge are made of malleable cast iron (NX-4 uses cast steel), the closing pin is stainless steel, and all iron parts are hot-dip galvanized for excellent corrosion resistance.
Reliable Grip Force: The wedge structure provides stable grip force and high breaking load, meeting various tension requirements.
Maintenance-Free: The wedge self-tightening structure requires no maintenance during operation, reducing subsequent maintenance costs.
Reusable:Removable after installation and can be reused, offering good economic efficiency.
Installation Instructions
◆ Pre-installation Preparation: Verify that the model matches the wire, inspect the product, and prepare the necessary tools.
◆ Conductor Preparation: Clean the conductor of oxidation and debris. There is no need to strip the aluminum strands. For steel-core aluminum stranded wire, ensure the steel core is not exposed; no conductive grease is required.
◆ Wedge Installation: Insert the conductor into the body, place the wedge, and tap the wedge lightly until it fits snugly. Ensure the conductor is secure and the wedge is not misaligned.
◆ Post-installation inspection: Verify that the wedge is securely fastened and the wire does not slip. Install the insulating cover. When working at heights, ensure the installation is firmly secured before loosening the pull rope.
Application Scope
Guy Wire Systems: Primarily used for fixing guy wires on guyed poles and towers, including corner poles, terminal poles, and tension poles.
Overhead Ground Wires: Fixing the tension section of overhead ground wires (lightning protection wires) for transmission lines.
Distribution Lines: Tension, corner, and terminal poles for 10kV and below distribution lines.
Transmission Lines: Guy wire and overhead ground wire systems for 35kV and above transmission lines.
Communication Lines: Fixing guy wires on overhead communication lines.
Railway Contact Network: Fixing guy wires in railway electrification contact network systems.
After-Sales Policy
Quality assurance: Products are designed, manufactured, and inspected strictly in accordance with national standards GB/T 2314, DL/T 759, etc., and a certificate of quality is provided.
Technical Support: We provide 24-hour technical consultation services to assist in resolving technical issues related to selection, installation, and use.
Due to the special nature of this product, returns without reason within seven days are not supported. For exchanges, a 15% handling fee will be deducted; round-trip shipping costs are borne by the buyer.
FAQ
Q: What is the difference between NX Wedge Cable Clamps and NUT clamps?
A: NX is a non-adjustable wedge clamp with a fixed length after installation; NUT (NX + U-screw + T-screw) is an adjustable wedge clamp, allowing adjustment of the guy wire length and tension by adjusting the screws. NX is used for the fixed end, and NUT is used for the adjusting end.
Q: How to choose the appropriateNX Wedge Cable Clamp model?
A: Select according to the diameter of the steel strand: Measure the outer diameter of the steel strand and refer to the technical parameter table to select a model covering that diameter range. For example, GJ-50 steel strand has a diameter of approximately 9.0mm, so NX-2 (Φ9.0~11.0mm) should be selected.
Q: Why is it necessary to rewind the steel strand during installation?
A: Rewinding the steel strand (rewinding after bending) is key to utilizing the wedge self-tightening principle. After rewinding, when the steel strand is under tension, the wedge will tighten between the steel strand and the clamp cylinder wall, forming a reliable anchor. The rewinding length is generally not less than 300mm.
Q: What are the consequences of installing the wedge backwards?
A: Rewinding the wedge will prevent locking and, in severe cases, cause a wire slippage accident. The larger end must face the larger opening of the clamp, and the smaller end must face the smaller opening. Carefully check the markings or consult a technician before installation.
Q: Can the wedge clamp be reused?
A: Yes. NX wedge clamps can be disassembled and reused after installation. However, after disassembly, the body and wedges should be inspected for cracks, deformation, or severe wear. If any damage is found, they should be replaced.
Q: What is the difference between the NXL series and the NX series?
A: NXL is an aluminum alloy wedge tension clamp, mainly used for overhead insulated conductors; NX is a cast iron/steel wedge clamp, mainly used for steel strands. NXL features energy saving (no hysteresis loss) and insulation (with insulating cover), suitable for 10kV distribution lines; NX is mainly used for guy wires and ground wires.
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