Automatic Come-Along Clamps For OPGW Optical Ground Wire Overhead Transmission Lines
Automatic come-along clamps for OPGW (Optical Ground Wire) are specialized installation tools designed to grip and hold OPGW cables securely during stringing and installation on overhead transmission lines. These clamps enable safe and efficient pulling of the cable up to the desired sag tension.
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Automatic come-along clamps for OPGW (Optical Ground Wire) are specialized installation tools designed to grip and hold OPGW cables securely during stringing and installation on overhead transmission lines. These clamps enable safe and efficient pulling of the cable up to the desired sag tension.
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: There are two main types of OPGW come-along clamps:
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: These clamps automatically grip the cable when tension is applied, facilitating easier and faster installation.
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: These require manual tightening with bolts and are typically used for high-tension or big sag stringing operations.
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: Usually made from high-strength aluminum alloy, providing a lightweight yet durable body that protects the cable during installation.
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: The clamps feature specially designed jaws (round or long jaws) to protect the delicate optical fibers inside the OPGW cable while maintaining a firm grip.
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: Rated working loads typically range from 16 kN to 25 kN, with maximum breaking forces up to 75 kN depending on the model.
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: Designed to accommodate OPGW cables with diameters generally between 10 mm and 20 mm.
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: Automatic clamps weigh around 5.6 kg, while bolted clamps are lighter, around 3 to 3.8 kg.
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: Used for holding and pulling OPGW cables during installation on overhead lines, ensuring the cable does not slip or get damaged.
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: Accessories such as double pulleys and counterweight devices are often used alongside these clamps to facilitate smooth cable installation and prevent spiraling.
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| Model | Type | Rated Load (kN) | Cable Diameter (mm) | Weight (kg) | Notes |
|---|---|---|---|---|---|
| SKG-16 | Automatic | 16 | 11-15 | 5.6 | Long jaw to protect optic cable |
| SKG-2.5 | Bolted | 25 | 11-17 | 3 | Round jaw, used with wrench |
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For tensions exceeding a single clamp’s rated load, multiple come-along clamps should be used in series.
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Clamps must be properly maintained, including cleaning and inspection before and after use.
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The cable should be dead-ended promptly once the desired sag tension is reached, and the come-along clamps removed.
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Automatic come-along clamps for OPGW are essential tools in overhead optical ground wire installation, providing secure, non-damaging grip on cables during stringing. Their aluminum alloy construction, specialized jaw designs, and load ratings ensure safe and efficient cable handling. Both automatic and bolted types are available to suit different tension and installation needs, making them widely used in transmission line projects worldwide.
