4-Bundle Conductor Stringing Block for ≤630mm² Lines | Nylon Wheel Transmission Cable Pulley

Overview

This Four-Bundled Conductor Stringing Block is specifically designed for guiding up to 4 bundled conductors with a total section area of ≤630 mm² during overhead power transmission line construction. Equipped with high-strength nylon sheaves, it ensures smooth conductor passage, reduced friction, and excellent cable protection during stringing, sagging, and tensioning operations.

Widely used in 110kV–500kV transmission projects, this pulley block is a reliable tool for EPC contractors, utility providers, and line construction teams.

What Is a Four-Bundled Conductor Stringing Block?

A 4-bundle stringing block is a specialized pulley with four sheaves arranged to support and guide quad bundled conductors. It distributes load evenly, reduces conductor wear, and improves stringing efficiency on high-tension, long-span overhead power lines.

Key Features

Four Nylon Sheaves (Quad-Pulley Design)

• Wear-resistant and lightweight sheaves

• Smooth surface for superior conductor protection

• Ideal for steel-core aluminum conductor and fiber composite conductor

High Load Capacity

• Engineered for high-tension pulling during transmission line construction

• Suitable for up to 630 mm² conductor bundles

Precision Ball-Bearing Rotation

• Low-friction operation

• Stable and smooth conductor movement during pulling or sagging

Durable Steel Frame

• Heavy-duty welded structure

• Anti-corrosion surface treatment for long outdoor service life

Multiple Hook Types Available

• Swivel hook

• Clevis fitting

• Fastening frame (optional)

Advantages

Excellent Cable Protection

Nylon sheaves reduce abrasion, heat buildup, and conductor damage.

Optimized for High-Voltage Lines

Designed for quad-bundle conductors commonly used in 110kV–500kV transmission lines.

Long-Term Reliability

Corrosion-resistant materials withstand harsh weather and continuous field use.

Efficient Stringing

Reduces pulling resistance, improving construction efficiency and reducing labor effort.

Customizable Options

Sheave diameter, groove type, hooks, and frame structure can be tailored to project specifications.

Applications

• High-voltage and extra-high-voltage transmission line construction

• Quad-bundled conductor stringing operations

• Sagging, tensioning, and conductor alignment tasks

• Mountainous or long-span line projects

• OPGW/ADSS installation (optional groove type)

• Power utility and EPC contractor field work

Specification:

Single Wheel-Wheel material aluminum or Nylon, and it could be covered by rubber.

Three Wheels-The pulleys are suitable for string two or three bundled conductor lines.

Five Wheels-The pulleys are suitable for string four bundled conductor lines.

FAQ

1. What conductor types can it support?

It supports quad-bundled ACSR, AAAC, ACCC, or composite conductors up to 630 mm².

2. Why use nylon sheaves?

Nylon sheaves reduce friction, absorb impact, and provide better conductor protection than aluminum.

3. Is the sheave diameter customizable?

Yes, 508 mm, 660 mm, 822 mm, and other sizes are available.

4. Can the hook type be changed?

Yes. Hook, clevis, and swivel hooks can be supplied based on installation needs.

5. Is it suitable for long-span transmission lines?

Absolutely. The 4-sheave structure provides stability and reliability in challenging terrain.

6. Do you offer 1 / 3 / 5-bundle conductor pulley blocks?

Yes, a complete range is available.