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Type NLL-2 is a bolted tension clamp made of high-strength aluminum alloy. As a key component of power fittings for overhead lines, its main function is to fix conductors on tension towers and bear the tension of the line.
Material: High-strength aluminum alloy (distinguished from the malleable cast iron material of the NLD series)
Structure: Integrally cast, with conductors fastened by U-bolts to form a reliable connection
Tensión nominal: Suitable for overhead lines of 35kV and below
Protection Performance: Can be used with insulating protective sleeves and is applicable to insulated conductors
Technical Parameters
| Elemento de parámetro | Parameter Value | Remarks |
| Applicable Conductor Diameter | 8.2~17.0mm (mainstream specification: 10.1~14.0mm) | Covers conductors with cross-section of 50~120mm |
| Number of U-bolts | 2 | Standard configuration |
| Bolt Specification | M12 | High-strength bolts |
| Breaking Load | 40kN | Key indicator for ensuring line safety |
| Dimensiones generales | Aproximadamente 212*180*9milímetros | Specific dimensions vary slightly by manufacturer |
| Peso | Approximately 0.82kg | Lightweight design |
Escenarios de aplicación
Tension Sections of Overhead Lines: Used on tension towers at line corners, terminals or straight sections to fix aluminum stranded conductors or steel-cored aluminum stranded conductors
Insulated Conductor Systems: Used with insulating protective sleeves for fixing and protecting insulated overhead conductors
Distribution Network Construction: Widely applied in the construction of urban and rural distribution network lines
Key Operation Instructions
- Confirm that the conductor specification matches the clamp model before installation
- Use a torque wrench to tighten the U-bolts according to the specified torque (usually 40~50N·m)
- For insulated conductors, install the insulating protective sleeve first before mounting the clamp
- Después de la instalación, check that the clamp is in tight contact with the conductor without any looseness
Precauciones
– It is strictly prohibited to use on lines exceeding the rated voltage
– For conductors of different materials (p.ej., copper-aluminum connection), select special transition clamps
– Regularly inspect the clamp connection for abnormalities such as looseness and corrosion
Comparison with Similar Products
The NLL series is divided into five specifications from NLL-1 to NLL-5 according to the ascending order of conductor diameter. Type NLL-2 is suitable for medium-diameter conductors. Compared with the cast iron NLD series, the aluminum alloy NLL series has advantages such as light weight, good electrical conductivity and strong corrosion resistance, making it especially suitable for use in coastal and humid areas.
The Type NLL-2 Aluminum Alloy Bolted Tension Clamp is an important power fitting for fixing medium-specification conductors and bearing tension in overhead power lines. It features a simple structure, convenient installation and reliable strength, and is a standard power equipment commonly used in distribution network construction and renovation.
Nota: Specific technical parameters may vary slightly depending on the manufacturer. It is recommended to refer to the detailed specification sheet provided by the manufacturer when purchasing.
