Overhead Power Line Stringing Equipment Aerial Cable Conductor Running Out Block
An Overhead Power Line Stringing Aerial Cable Conductor Running Out Block is a specialized pulley block used during the stringing of overhead conductors and aerial cables on distribution and transmission power lines. Its primary function is to guide and support the conductor as it is pulled along the route, reducing friction and preventing damage to the cable.
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An Overhead Power Line Stringing Aerial Cable Conductor Running Out Block is a specialized pulley block used during the stringing of overhead conductors and aerial cables on distribution and transmission power lines. Its primary function is to guide and support the conductor as it is pulled along the route, reducing friction and preventing damage to the cable.
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: Typically made from nylon or aluminum alloy, with sheaves mounted on ball bearings for smooth rotation and reduced friction. Some sheaves have grooves lined with nylon or aluminum sectors to protect conductor surfaces.
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: Common sizes range from 508 mm to 1160 mm, chosen based on conductor diameter and stringing tension.
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: Working loads typically range from 40 kN to 150 kN, depending on block size and number of sheaves.
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: Available as single, triple, five, six, or seven-sheave blocks, allowing for stringing of single or bundled conductors simultaneously.
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: Usually made from galvanized steel, often openable for easy installation on towers, with options for swiveling hooks or forks for flexible attachment.
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Non-fleeting devices to prevent conductor slippage on lateral sheaves.
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Grounding devices to safely discharge static electricity or lightning currents.
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Optional copper grounding cables with clamps for tower connection.
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Demountable attachments that can rotate 90° for optimal positioning.
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Stringing overhead conductors such as ACSR, AAAC, OPGW, and ADSS cables on high-voltage transmission and distribution lines.
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Guiding bundled conductors during simultaneous stringing operations.
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Facilitating smooth conductor pulling, minimizing wear and mechanical stress on cables.
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| Model / Brand | Sheave Diameter (mm) | Number of Sheaves | Working Load (kN) | Special Features |
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| SHDN660 / SHSQN822 | 508 - 1160 | 1 - 7 | 40 - 150 | Nylon or aluminum alloy sheaves, ball bearings |
| F144 / F150 | ~508 - 660 | 1 - 3 | Up to 180 (daN) | Aluminum sheaves, galvanized steel frame, non-fleeting devices |
| F145 / F149 | ~660 - 950 | 3 - 5 | Up to 25000 kN (reinforced sheave) | Multi-sheave for bundled conductors, swiveling attachments |
| F188 / F189 | ~660 - 950 | 6 - 7 | High load capacity | For 4-6 bundled conductors, optional grounding devices |
| Carabelli Srl Railway Running Out Block | 150 | 1 | 500 daN | Galvanized steel frame, nylon sheave, lightweight |
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Running out blocks are mounted on towers or temporary supports along the transmission line route.
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Larger sheave diameters reduce conductor bending stresses and friction during stringing.
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Multi-sheave blocks enable efficient simultaneous pulling of bundled conductors, improving installation speed.
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Optional grounding and anti-fleeting devices enhance safety and conductor stability during stringing.
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Some models include automatic disengaging devices for easy recovery after stringing.
Running out blocks are critical components in overhead power line conductor stringing, designed to ensure smooth, safe, and efficient cable pulling. They come in various sizes and configurations to accommodate different conductor types and project requirements, with materials and features tailored to protect conductors and improve operational safety.
Manufacturer Ningbo Changshi provide a wide range of running out blocks suitable for distribution and high-voltage transmission line construction, offering options from single sheave blocks for smaller conductors to multi-sheave blocks for complex bundled conductor stringing.
