1. Product-Specific Details
1.1 Specification Parameters
Na2xs2y cables are specifically engineered as 3-core
Copper Conductor Cables, tailored to meet the rigorous demands of medium and high-voltage power transmission systems. Their voltage rating spans 10kV, 20kV, and 35kV, making them versatile across a spectrum of applications, from urban distribution networks to industrial power grids. Each core within the cable features a conductor with a cross-sectional area of 240mm², a specification that ensures robust current-carrying capacity. This size is carefully chosen to balance power transmission efficiency and material usage, allowing the cable to handle continuous currents ranging from 450A to 600A, depending on the voltage level and installation conditions. For instance, in 35kV applications, the cable can sustain higher current loads without excessive heat buildup, a critical factor in preventing insulation degradation.
The conductors themselves are constructed from high-purity electrolytic copper, which boasts a conductivity of approximately 58 MS/m at 20°C—significantly higher than alternative materials like aluminum. This high conductivity minimizes resistive losses during power transmission, translating to lower energy wastage and improved overall system efficiency. The
Copper Conductors are stranded, typically using a class 2 stranding configuration, which enhances
Flexibility. This flexibility is essential for installation in environments where bending or maneuvering around obstacles is necessary, such as in confined cable ducts or around structural supports in industrial facilities.
The insulation layer is composed of cross-linked polyethylene (XLPE), a material renowned for its exceptional electrical and mechanical properties. XLPE insulation in these cables has a minimum dielectric strength of 20kV/mm, ensuring effective isolation of the conductors even under the maximum operating voltages of 35kV. Additionally, the XLPE insulation is designed to operate continuously at temperatures up to 90°C, with short-term overload capabilities of 130°C for up to 5 seconds, making it resilient to transient temperature spikes common in high-demand scenarios.
The overall diameter of the cable varies slightly based on the voltage rating, with
10kv Cables typically measuring around 45mm, 20kV at 50mm, and 35kV at 55mm. This dimensional consistency across voltage levels simplifies installation planning, as conduit and cable tray sizes can be standardized for projects involving multiple voltage grades. The cable’s weight per meter ranges from 4.5kg to 6kg, depending on the voltage rating, which influences handling requirements during installation but remains manageable with
Standard Cable-laying equipment.
1.2 Special Applications
The Na2xs2y cables find extensive application across diverse sectors, owing to their adaptability to varying voltage requirements and robust construction. In urban power distribution, these cables are integral to upgrading aging grid infrastructure, where their 10kV and 20kV ratings facilitate efficient power delivery from substations to residential and commercial areas. Their 3-core design aligns with the three-phase power systemscommonly used in urban settings, ensuring compatibility with existing infrastructure and minimizing the need for complex modifications.
Industrial facilities, such as manufacturing plants and refineries, rely on the 35kV variant of Na2xs2y cables for transmitting power to high-capacity machinery and equipment. The cables’ ability to handle high currents and resist thermal stress makes them suitable for environments where continuous operation is critical, and downtime is costly. Additionally, their
Chemical Resistance—particularly the XLPE insulation’s immunity to oils, solvents, and mild acids—ensures longevity in industrial settings where exposure to such substances is common.
Renewable energy projects, including wind farms and solar parks, also benefit from Na2xs2y cables. In wind farms, the
35kv Cables are used to collect power from multiple turbines and transmit it to the main substation, withstanding the harsh outdoor conditions—including temperature fluctuations, UV radiation, and moisture—that characterize these environments. Similarly, in solar parks, the 10kV and 20kV cables efficiently distribute power from solar panels to inverters and grid connection points, where their durability ensures reliable performance over the 25+ year lifespan typical of such projects.
Another key application is in large-scale construction projects, such as airports, shopping malls, and data centers. These facilities require a stable and high-capacity power supply, and Na2xs2y cables provide the necessary reliability. For example, data centers, which operate 24/7 and have stringent uptime requirements, utilize the cables to connect backup generators to critical loads, leveraging their fast overload capabilities to ensure uninterrupted power during grid outages.
In rural electrification initiatives, the 10kV and 20kV Na2xs2y cables are deployed to extend power access to remote areas. Their robust PVC outer sheath (a standard feature in the cable design) protects against rodent damage and soil abrasion, common challenges in rural environments with limited maintenance resources. This durability reduces the frequency of repairs, lowering the long-term operational costs associated with rural power networks.
1.3 Materials and Styles
The materials used in Na2xs2y cables are selected to optimize performance, durability, and safety. The
Copper Conductors are manufactured from 99.9% pure electrolytic copper, ensuring minimal impurities that could compromise conductivity. The stranding process involves twisting multiple
Copper Wires together, which not only enhances flexibility but also increases the conductor’s surface area, improving heat dissipation—a critical factor in maintaining performance during high-current operation.
The XLPE insulation is produced using a peroxide cross-linking process, which transforms the linear polyethylene polymer into a three-dimensional network structure. This cross-linking imparts superior thermal stability compared to non-cross-linked polyethylene, preventing the insulation from melting or flowing under high temperatures. The XLPE is also compounded with antioxidants and UV stabilizers to resist degradation from environmental factors, extending the cable’s service life.
Beneath the insulation, a semi-conductive layer is applied to ensure smooth electric field distribution, reducing the risk of partial discharges that can degrade insulation over time. This layer is typically composed of carbon-black-filled polyethylene, which exhibits conductive properties while maintaining compatibility with the XLPE insulation.
The outer sheath of Na2xs2y cables is made from high-quality PVC, formulated for enhanced mechanical strength and weather resistance. The
PVC Sheath has a Shore hardness of 85±5, providing excellent resistance to abrasion and impact, while its flame-retardant properties meet the IEC 60332-1 standard, ensuring the cable self-extinguishes in the event of a fire, limiting fire spread.
In terms of styles, the cables are available in both armoured and non-armoured variants. The armoured version features a layer of galvanized
Steel Tape or wire braiding beneath the PVC sheath, offering additional protection against mechanical damage in high-risk environments such as underground installations with rocky soil or areas prone to rodent activity. Non-
Armoured Cables, on the other hand, are lighter and more flexible, making them suitable for indoor installations or protected conduit systems where mechanical stress is minimal.
1.4 Production Process
The manufacturing of Na2xs2y cables involves a series of precision-controlled processes to ensure consistency and quality. The production begins with the stranding of copper wires to form the conductors. Automated stranding machines twist the individual copper wires into the 240mm² conductors, with tension control systems ensuring uniform lay length and preventing wire breakage. Each stranding operation is monitored by quality control personnel to verify conductor dimensions and electrical continuity.
Next, the conductors undergo a cleaning process to remove oils, dirt, and oxides, ensuring optimal adhesion of the insulation. The cleaned conductors are then fed into an extrusion line, where molten XLPE is applied to form the insulation layer. The extrusion process is computer-controlled to maintain a uniform insulation thickness—typically 2.5mm for 10kV, 3.0mm for 20kV, and 4.0mm for 35kV—with laser diameter gauges providing real-time feedback to adjust the extrusion parameters as needed.
Following extrusion, the
Insulated Conductors enter a cross-linking tube, where they are subjected to high temperature and pressure (using steam or nitrogen) to activate the peroxide cross-linking agents in the XLPE. This step is critical, as proper cross-linking ensures the insulation’s thermal and mechanical properties meet specifications. The cross-linking process is carefully timed, with the duration varying based on the insulation thickness, to ensure complete cross-linking without overprocessing, which could degrade the material.
After cross-linking, the three insulated conductors are cabled together using a cabling machine, which twists them into a compact 3-core configuration. A filling compound—typically a water-blocking material—is applied between the cores to prevent moisture ingress, a crucial feature for underground or wet environments. The semi-conductive layer is then applied over the cabled cores, followed by the PVC outer sheath, which is extruded in a separate process to ensure complete coverage and adhesion.
Quality control checks are integrated throughout the production process, including conductor resistance testing, insulation thickness measurements, dielectric strength testing, and thermal cycling tests. Each batch of cables undergoes a sample test for long-term aging, where specimens are subjected to elevated temperatures and voltages for extended periods to verify durability. Only cables that meet all performance criteria are approved for shipment.
2. Product General Information
2.1 Packaging
Na2xs2y cables are packaged to ensure protection during storage, transportation, and handling. The cables are wound onto wooden or steel reels, with reel sizes varying based on the cable length. Standard reel sizes accommodate 500m, 1000m, and 2000m lengths, allowing customers to select the most suitable option for their project requirements. For shorter lengths (e.g., 100m or 200m), cables may be supplied in coils wrapped in heavy-duty plastic sheeting, secured with steel bands to prevent unwinding.
The reels are fitted with steel flanges to protect the cable edges from damage, and the cable itself is wrapped in a moisture-resistant barrier—typically a polyethylene film—to shield it from water and dust during transit. Each reel is labeled with essential information, including the cable type (Na2xs2y), voltage rating, conductor size, length, batch number, and manufacturing date, enabling easy identification and traceability. Additionally, handling instructions and safety warnings (e.g., “Do not drop” and “Use appropriate lifting equipment”) are printed on the reels to guide proper handling.
For international shipments, reels are further secured in wooden crates to comply with ISPM 15 standards, which regulate the treatment of wooden packaging to prevent the spread of pests. Crates are reinforced with steel straps and marked with shipping details, including destination, consignee, and weight, to facilitate logistics and customs clearance.
2.2 Transportation
Transportation of Na2xs2y cables is managed to minimize the risk of damage, with strict protocols for loading, securing, and unloading. For road transport, reels are loaded onto flatbed trucks using forklifts or cranes, ensuring that the center of gravity is balanced to prevent tipping during transit. Reels are secured to the truck bed using steel chains or straps, with padding placed between the straps and the reel flanges to avoid dents or scratches.
For sea freight, reels are stowed in containers, with wooden dunnage used to stabilize them and prevent movement during rough seas. Container floors are lined with moisture-absorbent materials to protect the cables from condensation. Air freight is reserved for urgent, small-quantity shipments, with cables packaged in compact coils to meet weight and size restrictions.
Throughout transportation, temperature and humidity are monitored for sensitive shipments, ensuring that cables are not exposed to extreme conditions that could compromise the insulation or sheath. Delivery vehicles are equipped with lift gates or cranes for efficient unloading at the customer’s site, and delivery personnel are trained to handle reels safely to prevent accidents.
2.3 Shipping
Orders for Na2xs2y cables are processed within 24 hours of receipt, with production lead times varying based on the quantity and specifications. Standard orders (e.g., 10kV and 20kV cables in common lengths) are typically shipped within 7–10 business days, while custom orders (e.g., 35kV cables with special sheath colors or armoring) may take 15–20 business days.
Once production is complete, customers receive a shipping confirmation email containing the tracking number, estimated delivery date, and copies of the commercial invoice and packing list. For international shipments, additional documents such as certificates of origin, material safety data sheets (MSDS), and compliance certificates (e.g., CE, UL) are included to facilitate customs clearance.
The company partners with reputable logistics providers to ensure reliable delivery, offering both standard and expedited shipping options. Standard shipping typically takes 3–5 business days for domestic destinations and 10–15 business days for international destinations, while expedited shipping reduces these times to 1–2 business days and 5–7 business days, respectively. Customers can track their shipments in real time via the logistics provider’s website or mobile app, with notifications sent for key milestones such as departure, arrival at a regional hub, and final delivery.
2.4 Samples
Samples of Na2xs2y cables are available upon request to allow customers to verify quality and compatibility before placing bulk orders. Sample lengths are typically 1–5 meters, depending on the customer’s needs, and include all key components (conductor, insulation, sheath) to provide a comprehensive representation of the cable’s construction.
Samples are processed within 3–5 business days and shipped via express courier to ensure prompt delivery. While samples are provided free of charge for qualified customers (e.g., utilities, EPC contractors), shipping costs may apply, depending on the destination. Customers can request samples through the company’s website, email, or sales representatives, specifying the voltage rating, conductor size, and any special requirements (e.g., armoured vs. non-armoured).
Each sample is accompanied by a certificate of conformance, detailing the test results for key parameters such as conductor resistance, insulation thickness, and dielectric strength. This allows customers to compare the sample’s performance against their specifications and industry standards. Feedback from customers on samples is actively sought and used to refine products or address any concerns before full-scale production.
2.5 After-Sales Service
The company offers comprehensive after-sales service to support customers throughout the lifecycle of Na2xs2y cables. A dedicated technical support team is available 24/7 to assist with installation guidance, troubleshooting, and technical queries. Customers can reach the team via phone, email, or video call, with response times guaranteed within 2 hours for urgent issues.
In the event of a cable failure or performance issue, the company conducts thorough investigations to identify the root cause. If the issue is determined to be a manufacturing defect, replacement cables are provided free of charge, and the company works with the customer to implement corrective measures to prevent recurrence. For failures due to improper installation or misuse, the technical team provides guidance on rectification and offers training to prevent future issues.
Warranty coverage for Na2xs2y cables spans 15 years from the date of installation, covering defects in materials and workmanship. The warranty includes free replacement of faulty cables and, if necessary, on-site technical support to facilitate replacement. To claim warranty service, customers provide the batch number and proof of purchase, and the company arranges for inspection and resolution within 5–7 business days.
Additionally, the company offers training programs for customers’ installation and maintenance teams, covering topics such as proper cable handling, termination techniques, and routine inspection procedures. These training sessions are available both on-site and online, ensuring that customers have the knowledge to maximize the performance and lifespan of their Na2xs2y cables. Regular follow-up checks are conducted post-installation to gather feedback and address any emerging issues, fostering long-term customer relationships.
In summary, Na2xs2y cables combine advanced materials, precise manufacturing, and versatile design to meet the demands of medium and high-voltage power transmission across diverse applications. From their robust construction and high-performance specifications to comprehensive packaging, transportation, and after-sales support, these cables are engineered to deliver reliability and efficiency throughout their service life.
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