Selecting the right stripping tool is crucial for a clean, damage-free strip. The most common types are:

• Three-hole fiber strippers: These are a must-have for field technicians. Each hole is pre-set to strip a specific layer of the fiber: the outer jacket, the 900-micron buffer, and the 250-micron coating.

• Armored cable slitters/strippers: Designed for tough, heavy-duty cables, these tools can make both longitudinal and circular cuts. They are essential for armored fiber optic cables, such as ADSS, to get through the protective jacket without harming the internal fibers.

• Thermal strippers: These tools use heat to soften the coating, allowing for a clean and precise strip, especially useful for ribbon fibers.

The key is using the right tools and following best practices. A nick or scratch on the fiber can lead to significant signal loss. Our high-precision stripping tools are designed with specific tolerances to ensure a clean, smooth strip every time. They are factory-calibrated, so no adjustments are needed. For armored cables, our adjustable blade depth ensures you cut only the jacket, not the inner tube or fiber. Additionally, using a three-hole stripper in the correct sequence ensures each layer is removed cleanly. We also recommend regular cleaning and maintenance of your tools to keep the blades sharp and functional.

Choosing the right hardware is critical for the safety and longevity of your power line. Key factors to consider include:

• Conductor Type and Size: Different clamps are designed for specific conductor materials (e.g., ACSR, AAAC, AAC) and diameters. Using an improperly sized clamp can lead to conductor damage or failure.

• Application: The purpose of the hardware matters. A dead-end clamp is for terminating a line, while a guy grip is for tensioning a guy wire.

• Environmental Conditions: The hardware must be able to withstand local environmental factors, such as high winds, extreme temperatures, and corrosive elements. Our hot-dip galvanized and aluminum alloy products offer superior durability and corrosion resistance.

• Required Tension: The tension rating of the hardware must meet or exceed the maximum tension of the line. Using a dynamometer is recommended to ensure the tension is set correctly during the stringing process.

For underground cable laying, the process relies heavily on specialized pulling equipment rather than static hardware. Our solutions for this include:

• Hydraulic Cable Pullers and Winches: These are the primary tools used to pull long lengths of heavy underground cables through conduits and trenches. They offer precise control over the pulling force and speed, preventing damage to the cable.

• Conductor Pulling Grips: These are used to securely attach the pulling rope to the cable, ensuring the force is distributed evenly and the cable's jacket is not damaged.

Best practices involve a careful planning process, including calculating the exact pulling tension required for the cable run and monitoring this tension in real-time using tension meters. This ensures the cable is not over-stressed, which could lead to damage or premature failure.

A conductor stringing method statement is a formal document that details the step-by-step procedures, equipment, personnel, and safety precautions required for installing conductors on a power line project. Its importance cannot be overstated:

• Safety: It is the cornerstone of a safe operation, identifying potential hazards and outlining control measures to protect workers and the public. It ensures compliance with international safety standards and regulations.

• Efficiency: It provides a clear, logical sequence for the entire stringing process, from preparatory work to final inspection. This eliminates guesswork, minimizes delays, and ensures the project is completed on time and within budget.

• Quality: The statement specifies the correct use of tools and equipment, such as tensioners, pullers, and stringing blocks, to prevent damage to the conductor. It also defines the precise sagging and tensioning parameters, guaranteeing the long-term integrity and performance of the line.

There are two primary methods for overhead conductor stringing:

• Slack Stringing (or Ground Stringing): This is a traditional method where the conductor is pulled along the ground and then lifted into position. It is typically used for low-voltage distribution lines where terrain and obstacles are not an issue. This method requires a drum stand, a winch, and running-out blocks, but a full puller-tensioner system is not essential.

• Tension Stringing: This is the most common and safest method for high-voltage and extra-high-voltage transmission lines. The conductor is held clear of the ground and obstacles from the drum to the last tower using specialized equipment. This prevents damage to the conductor and the surrounding environment.

Ningbo Changshi is a specialist in tension stringing equipment. Our comprehensive range includes:

• Hydraulic Puller-Tensioners: Designed for precise control over conductor tension.

• Anti-twisting Steel Wire Rope: Prevents damage from torsion during the pull.

• Conductor Running-out Blocks: High-quality, anti-friction blocks to ensure a smooth and efficient pull.

• Reel Stands and Jacks: For the safe and stable management of conductor drums.

• Conductor Grippers, Swivels, and Connectors: To securely link the pulling rope to the conductor.

Safety is our highest priority. A robust safety plan is integral to every stringing operation. Key safety precautions include:

• Pre-installation Safety Checks: A thorough site risk assessment before work begins, checking weather conditions, and inspecting all equipment for defects.

• Grounding and Bonding: Proper grounding of all stringing equipment (pullers, tensioners, reel stands) and towers to prevent electrical hazards from induction or accidental contact with live lines.

• Safe Clearance Distances: Maintaining a safe minimum clearance distance from existing live lines, as defined by local and national regulations.

• Communication: Establishing a reliable communication network (e.g., walkie-talkies) between all personnel on-site, especially between the puller and tensioner operators.

• Personnel Training: Ensuring all workers are trained and certified in safe work practices, fall protection, and emergency procedures.

• Equipment Inspection: Using high-quality, regularly inspected tools and equipment from a trusted manufacturer like Ningbo Changshi.

A typical tension stringing project follows a well-defined sequence:

1. Preparation: Site clearance, access road preparation, and establishing the layout for equipment and conductor drums.

2. Insulator and Block Installation: Installing insulator strings and conductor running-out blocks on all towers within the stringing section.

3. Pilot Wire Stringing: Pulling a small-diameter pilot wire through the running-out blocks.

4. Pulling Rope Installation: Using the pilot wire to pull the larger-diameter pulling rope.

5. Conductor Pulling: The pulling rope is attached to the conductor via a swivel and running board, and the hydraulic puller-tensioner system pulls the conductor through the blocks.

6. Sagging: After the conductor is in place, it is tensioned to achieve the precise sag as per the design specifications.

7. Clamping and Accessories: The conductor is finally clamped to the insulators, and accessories like spacers, dampers, and vibration dampers are installed.

8. Final Inspection: A thorough final check of the entire line to ensure all components are properly installed and secured.

We are confident that with our expertise and high-quality equipment, Ningbo Changshi Electric Power Machinery Manufacturing Limited can be the reliable partner for all your OHTL and underground cable laying needs.

Answer (from Ningbo Changshi): The best machine depends on your project's scale, required pulling force, and the type of terrain. Hydraulic wire stringing machines, which we specialize in, offer superior control, high pulling capacity, and smooth, continuous operation. This makes them ideal for intermediate to long-distance overhead and underground projects over rugged landscapes. Mechanical machines are typically used for smaller projects, while modern digital stringing machines with advanced controls and sensors are used for maximum precision and safety on critical projects like OPGW installation.

Answer (from Ningbo Changshi): When selecting a machine, always consider the pulling capacity (kN), the bullwheel diameter, the number of grooves, and the maximum rope/conductor diameter it can handle. For our hydraulic machines, we can provide detailed specifications to ensure the machine you choose is perfectly matched to your project’s demands for power, efficiency, and safety. We also offer machines with advanced features like negative self-acting brakes and hydraulic oil cooling systems to ensure durability and reliability.

Answer (from Ningbo Changshi): Safety and efficiency are our top priorities. Modern stringing machines, like our hydraulic puller-tensioners, are designed with features that prevent damage to conductors and reduce risk to personnel. These include automatic pull presetting systems that prevent overloading, negative safety brakes that engage automatically if power is lost, and radio remote controls for a safe operating distance. Proper training and using high-quality, well-maintained equipment and accessories are also critical for a safe operation.

Answer (from Ningbo Changshi): We offer hydraulic puller-tensioners, which are dual-function machines. These versatile machines can be configured to either pull or tension conductors with precision, making them highly efficient and cost-effective for a wide range of projects. This single-machine solution reduces equipment needs on the job site and simplifies logistics.

Answer (from Ningbo Changshi): As a prominent manufacturer and exporter, we provide comprehensive after-sales support. This includes providing all necessary spare parts, maintenance guidance, and technical assistance to ensure your equipment has a long and productive service life. Our goal is to be a one-stop solution for your entire project, from supplying the equipment to providing continuous support.

Answer (from Ningbo Changshi): The ideal machine for your project depends on its scale and specific requirements. We primarily offer advanced hydraulic conductor stringing machines, which are known for their powerful, precise, and infinitely variable tension control. They are perfect for intermediate to long-distance projects, heavy-duty performance, and challenging terrains. While manual machines are suitable for small, localized jobs and diesel-powered units are reliable in remote areas without a power supply, our hydraulic equipment offers the highest level of control, safety, and efficiency for professional operations.

Answer (from Ningbo Changshi): When choosing a machine, look for critical features that guarantee safety and high performance. Our equipment includes a closed hydraulic circuit for smooth, step-less speed variation and a negative self-acting hydraulic brake that automatically engages to prevent conductor damage if power is lost. We also incorporate a pull presetting system to prevent overloading, a hydraulic oil cooling system for long-term durability, and wear-proof nylon-lined bullwheels to protect the conductor. These features, along with a rugged frame and operator-friendly controls, are essential for a safe and efficient operation.

Answer (from Ningbo Changshi): Yes, to provide maximum versatility and efficiency, we specialize in hydraulic puller-tensioner machines. These dual-function units are engineered to perform both pulling and tensioning tasks from a single machine, which is especially useful for re-conductoring and OPGW projects. This versatility reduces the need for separate equipment, saving you time and cost on the job site.

Answer (from Ningbo Changshi): Our equipment is built for a wide range of challenging environments. For mountain areas and remote sites, we offer machines with powerful diesel engines for reliable operation without an external power source. Our equipment is also designed with hydraulic stabilizer jacks and robust frameworks for secure anchoring on uneven ground. For long-distance lines, our high-capacity hydraulic machines are ideal, as they can maintain constant tension and speed over several kilometers. We can provide customized solutions to meet the specific demands of any terrain or project scope.

Answer (from Ningbo Changshi): At Ningbo Changshi, we are committed to being your one-stop supplier. This means not only providing high-quality equipment but also ensuring your team can operate it safely and effectively. We provide comprehensive after-sales support and technical guidance. While our machines are designed for user-friendly operation, we offer detailed documentation and can provide remote technical assistance to help your team with setup, maintenance, and troubleshooting, ensuring maximum productivity and equipment longevity.

Answer (from Ningbo Changshi): Conductor stringing is the critical process of installing electrical conductors (wires) on overhead power line towers or poles. The method used is incredibly important because it directly impacts the safety, reliability, and longevity of the power line. For example, using the wrong method can cause permanent damage to the conductor's surface, leading to defects that may cause power losses or even structural failure over time. A proper stringing method ensures the conductor is installed correctly and safely, minimizing damage and guaranteeing the line's long-term performance.

Answer (from Ningbo Changshi): There are two main methods of conductor stringing:

• Tension Stringing: This modern and widely used method keeps the conductor elevated and under constant tension throughout the entire process, from the reel stand to the pulling equipment. This prevents the conductor from touching the ground or other obstacles, which is crucial for preventing surface damage and is essential for high-voltage and sensitive conductors like OPGW. This method requires specialized equipment, such as hydraulic pullers and tensioners, which we proudly manufacture.

• Slack Stringing: In contrast, this is a traditional method where the conductor is dragged along the ground and then lifted into position. This method is typically only used for low-voltage lines where conductor surface damage is not a major concern and the terrain is easily accessible.