NLD Tension Clamp (Bolt Type) is a commonly used hardware accessory in power lines, mainly used to fix conductors or overhead ground wires on tension insulator strings, serving as an anchor. It can also be used to fix guy wires of guyed towers. It is suitable for fixing small and medium cross-section conductors on tension towers in overhead power transmission lines and substations.
Multiple U-bolts provide large locking force on conductors;
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M |
C |
L1 |
L2 |
R |
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NLD-1 |
Φ5.0 ~ 10.0 |
16 |
18 |
150 |
120 |
6.5 |
2 |
12 |
20 |
1.3 |
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NLD-2 |
Φ10.1 ~ 14.0 |
16 |
18 |
205 |
130 |
8 |
3 |
12 |
40 |
2.1 |
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NLD-3 |
Φ14.1 ~ 18.0 |
18 |
22 |
310 |
160 |
11 |
4 |
16 |
70 |
4.6 |
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NLD-4 |
Φ18.1 ~ 23.0 |
18 |
25 |
410 |
220 |
12.5 |
4or5 |
16 |
90/100 |
7.0/7.1 |
Step 1: Conductor Preparation - Clean conductor surface, remove oxide layer and dirt - Wrap aluminum binding tape (1mm×10mm) at conductor installation position, wrapping direction consistent with outer layer stranding direction of conductor
Step 2: Clamp Installation - Place conductor into clamp groove, ensure conductor is centered in groove - Install pressure plate, ensure wavy groove of pressure plate fits tightly with conductor
Step 3: Bolt Tightening - Tighten U-bolts gradually in diagonal sequence - Use torque wrench to tighten evenly, ensure balanced force on all bolts - Recommended torque values: M12 bolts approximately 40-50N·m, M16 bolts approximately 80-100N·m
Step 4: Inspection and Acceptance - Check whether conductor and clamp are in tight contact without looseness - Confirm clamp grip force meets requirements (not less than 90% of conductor rated tensile strength) - Install cotter pins to prevent bolt loosening
After-Sales Service
Quality Assurance: Products are strictly designed, manufactured and inspected according to national standards GB/T 2314, GB 2320, etc., with quality certificates provided
Customization Service: Non-standard product customization services available according to customer special requirements
Technical Support: Provide 24-hour technical consultation services, assist in solving technical problems in selection, installation and use
Transmission Lines Widely used on tension towers of 10kV and below overhead transmission lines
Q1: What is the difference between NLD and NLL tension clamps?
A: The main differences are material and locking method. NLD uses malleable cast iron material with inverted vertical bolt compression; NLL uses high-strength aluminum alloy material with horizontal loop locking. NLD is suitable for ACSR, while NLL is more suitable for aluminum-clad steel stranded wire.
Q2: How to select the appropriate NLD model?
A: Select according to conductor outer diameter (including wrapping): Measure conductor diameter and select the model covering this diameter range from the technical parameter table. For example, for conductor diameter 15mm, NLD-3 (14.1-18.0mm) should be selected.
Q3: Why wrap aluminum binding tape during installation?
A: Wrapping aluminum binding tape can protect conductor from being crushed by clamp, increase friction to improve grip force, and prevent electrochemical corrosion. The aluminum binding tape material should be the same as the conductor, with thickness 1mm and width 10mm.
Q4: Can NLD tension clamps be reused?
A: Yes. NLD is a non-conductive type tension clamp that can be disassembled and reused after installation. However, after disassembly, check whether the clamp and bolts are intact, and replace if damaged.
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