Yjy23-0.6/1kv 3×25mm² Armoured Power Cable

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2025-09-15 03:55:19

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YJY23-0.6/1kV 3×25mm² Armoured Power Cable: Comprehensive Details

I. Product-Specific Details

1. Technical Specifications and Electrical Performance

The YJY23-0.6/1kV 3×25mm² armoured Power Cable is engineered to deliver consistent performance in low-voltage power distribution systems, with technical specifications that meet rigorous industrial standards. Its voltage rating of 0.6/1kV is a fundamental parameter, where 0.6kV represents the maximum phase-to-ground voltage and 1kV denotes the phase-to-phase voltage. This range aligns with global low-voltage standards, ensuring compatibility with electrical networks in industrial facilities, commercial buildings, and infrastructure projects worldwide.

The cable’s current-carrying capacity is a critical performance metric, directly influenced by its 3×25mm² Copper Conductor configuration. Under normal operating conditions (30°C ambient temperature), each 25mm² conductor can carry a continuous current of approximately 85A. This capacity is derated in higher temperatures: at 40°C, the current-carrying capacity drops to 76A, and at 50°C, it further reduces to 67A, ensuring safe operation without overheating. For bundled installations (up to 6 cables), a derating factor of 0.8 is applied, making the cable suitable for dense wiring environments common in industrial plants.

Electrical resistance is another key specification. At 20°C, the resistance of each 25mm² copper conductor is approximately 0.727Ω/km, which minimizes power loss during transmission. This low resistance ensures efficient energy delivery, even over distances up to 100 meters, with a voltage drop of less than 5%—a critical factor for maintaining stable operation of sensitive equipment.

The XLPE insulation provides a dielectric strength of ≥20kV/mm, enabling the cable to withstand transient voltage surges caused by lightning strikes or switching operations. The insulation resistance of the cable, measured at 20°C, exceeds 1000MΩ·km, ensuring reliable electrical isolation between conductors and preventing leakage currents. Capacitance between conductors is approximately 0.28µF/km at 50Hz, which is low enough to avoid significant reactive power losses in most applications.

The cable’s short-circuit withstand capacity is also noteworthy. It can tolerate a short-circuit current of up to 2.5kA for 1 second without sustaining permanent damage, providing a safety margin in the event of electrical faults. This capability is crucial for protecting both the cable and connected equipment in industrial settings where short circuits may occur due to equipment malfunctions or wiring errors.

2. Conductor and Insulation Materials

The YJY23-0.6/1kV 3×25mm² cable features high-purity electrolytic Copper Conductors, with a purity level of ≥99.95%. This high purity ensures excellent electrical conductivity (≥100% IACS), which is essential for minimizing power loss and ensuring efficient current transmission. The copper conductors are stranded, composed of multiple thin Copper Wires twisted together to form a 25mm² conductor. Stranding enhances Flexibility, allowing the cable to be bent and routed more easily during installation, while also improving the conductor’s mechanical strength and resistance to fatigue from repeated bending.

Each conductor is individually insulated with cross-linked polyethylene (XLPE), a material chosen for its superior thermal, electrical, and mechanical properties. XLPE is formed through a cross-linking process that creates strong chemical bonds between polymer chains, transforming the material from a thermoplastic to a thermoset. This cross-linking imparts several advantages:

Thermal Stability: XLPE can operate continuously at temperatures up to 90°C, with short-term overload capabilities up to 130°C, making it suitable for high-temperature environments such as industrial machinery rooms and power distribution cabinets.

Electrical Performance: XLPE has a high dielectric constant and low dielectric loss, ensuring effective insulation even at high voltages. Its resistance to partial discharge helps prevent insulation degradation over time, extending the cable’s service life.

Chemical Resistance: XLPE is resistant to a wide range of chemicals, including oils, greases, and mild acids, making it suitable for use in industrial environments where exposure to such substances is common.

Moisture Resistance: The cross-linked structure of XLPE prevents water absorption, ensuring reliable performance in damp or wet conditions, such as underground installations or outdoor environments.

Over the Insulated Conductors, the cable features a double Steel Tape armouring layer (designated by "23" in the cable type). The steel tape is galvanized to provide corrosion resistance, with a thickness of 0.3mm per layer. The two layers are applied helically with overlapping edges (overlap ≥20% of the tape width) to form a continuous protective barrier. This armouring provides exceptional mechanical strength, protecting the cable from impact, crushing, and rodent damage—critical for cables installed in underground trenches, concrete encasements, or industrial areas with heavy machinery.

The outermost layer of the cable is a PVC Sheath, which provides additional protection against environmental factors. The PVC sheath is formulated to be resistant to UV radiation, weathering, and abrasion, ensuring durability in both indoor and outdoor applications. It also acts as a moisture barrier, preventing water ingress into the armouring and conductors, which is essential for maintaining long-term performance in damp environments. The sheath has a thickness of 1.8mm, providing a balance between protection and flexibility.

3. Structural Design and Dimensions

The structural design of the YJY23-0.6/1kV 3×25mm² cable is optimized for both performance and ease of installation. The three 25mm² Stranded Copper Conductors are each insulated with XLPE, with an insulation thickness of 1.2mm. The insulated conductors are then twisted together in a helical pattern to form a compact core, reducing the overall diameter of the cable and improving its flexibility. The twisting lay length is controlled between 16 and 20 times the diameter of the Insulated Core, ensuring a balanced structure that minimizes signal interference and mechanical stress.

After twisting, the three insulated conductors are wrapped in a binder tape, typically made of polyester, to hold them together and provide additional structural stability. This binder tape also helps to prevent the conductors from moving relative to each other during installation and operation, which could otherwise lead to insulation damage.

Over the binder tape, the double steel tape armouring is applied. The first layer of steel tape is applied with a helical twist, followed by a second layer applied in the opposite direction to enhance the armouring’s strength and uniformity. The overlapping edges of the steel tape ensure that there are no gaps in the protection, creating a robust barrier against mechanical damage.

The outer PVC sheath is extruded over the steel armouring, forming a continuous protective layer that encapsulates the entire cable. The sheath is designed to adhere tightly to the armouring, preventing moisture from seeping between the layers and ensuring a smooth, uniform outer surface that is easy to handle and install.

The overall dimensions of the cable are carefully controlled to balance protection and practicality. The outer diameter of the cable is approximately 28mm, making it compact enough to be installed in Standard Cable trays and conduits. The cable has a weight of approximately 3.2kg/m, which is manageable for manual handling during installation, though mechanical lifting equipment may be required for longer lengths.

The minimum bending radius of the cable is 12 times its outer diameter (336mm) for fixed installations and 20 times (560mm) for flexible installations, allowing for routing around obstacles and through tight spaces. This flexibility, combined with its robust construction, makes the cable suitable for a wide range of installation scenarios.

4. Special Features and Applications

The YJY23-0.6/1kV 3×25mm² cable offers several special features that make it particularly suitable for demanding applications:

Enhanced Mechanical Protection: The double steel tape armouring provides superior resistance to impact, crushing, and rodent damage compared to unArmoured Cables. This makes it ideal for installation in areas where the cable may be exposed to physical stress, such as underground trenches, industrial workshops, and construction sites.

Weather Resistance: The PVC outer sheath is UV-resistant and weatherproof, allowing the cable to be used in outdoor applications without degradation. It can withstand exposure to sunlight, rain, snow, and temperature fluctuations, making it suitable for outdoor power distribution, street lighting, and agricultural installations.

Chemical Resistance: The XLPE insulation and PVC sheath are resistant to a wide range of chemicals, including oils, greases, and mild acids and alkalis. This makes the cable suitable for use in industrial environments such as factories, refineries, and chemical processing plants, where exposure to such substances is common.

Flame Retardancy: The cable is designed to be flame-retardant, meeting the requirements of IEC 60332-1-2 for vertical flame spread. This means it will self-extinguish when the source of ignition is removed, reducing the risk of fire propagation in the event of a cable fire.

Easy Installation: Despite its robust construction, the cable remains flexible enough for easy handling and installation. Its compact dimensions and manageable weight make it suitable for installation in cable trays, conduits, and underground trenches, with minimal need for specialized equipment.

These features make the YJY23-0.6/1kV 3×25mm² cable suitable for a wide range of applications:

Industrial Facilities: The cable is commonly used in factories, manufacturing plants, and industrial workshops to distribute power to motors, pumps, conveyors, and other heavy machinery. Its mechanical protection and chemical resistance make it ideal for these harsh environments.

Commercial Buildings: In shopping centers, office complexes, hospitals, and hotels, the cable is used for main power distribution, ensuring reliable electricity supply to lighting, HVAC systems, and other critical equipment. Its flame retardancy and reliability are particularly important in these occupied spaces.

Infrastructure Projects: The cable is widely used in infrastructure projects such as road construction, railway systems, and public utilities. It is suitable for underground power connections for street lighting, traffic signals, and public buildings, where its durability and weather resistance ensure long-term performance.

Outdoor Installations: For construction sites, agricultural facilities, and remote installations, the cable provides a reliable power supply. Its ability to withstand exposure to the elements and physical damage makes it suitable for these challenging environments.

Renewable Energy Systems: The cable is also used in small to medium-sized renewable energy systems, such as solar farms and wind turbines, to distribute power from the generation source to the grid or local distribution network. Its weather resistance and durability make it suitable for these outdoor, often remote installations.

5. Manufacturing Process and Quality Control

The manufacturing process of the YJY23-0.6/1kV 3×25mm² cable involves several stages, each subject to strict quality control measures to ensure consistent performance and reliability.

Conductor Production: The process begins with the production of the copper conductors. High-purity copper rods are drawn through a series of dies to reduce their diameter to the required size for the individual strands. These strands are then twisted together in a stranding machine to form the 25mm² conductors. The stranding process is carefully controlled to ensure uniform tension and lay length, which are critical for maintaining the conductor’s electrical and mechanical properties.

Insulation Extrusion: Each stranded copper conductor is then insulated with XLPE using an extrusion process. The XLPE material is fed into an extruder, where it is melted and applied to the conductor in a continuous layer. The extrusion process is controlled to ensure a uniform insulation thickness of 1.2mm, with an eccentricity of ≤10% to prevent weak points in the insulation. After extrusion, the insulated conductors undergo a cross-linking process, which involves heating the insulation to activate cross-linking agents, creating the thermoset structure. This process is critical for achieving the XLPE’s superior thermal and mechanical properties.

Core Twisting: The three insulated conductors are then twisted together to form the cable core. This is done using a cabling machine, which twists the conductors at a controlled lay length to ensure a compact, balanced core. A binder tape is applied during this process to hold the conductors together and provide additional structural stability.

Armouring Application: The twisted core is then passed through an armouring machine, where the double steel tape armouring is applied. The first layer of galvanized steel tape is wrapped helically around the core, followed by a second layer in the opposite direction, with overlapping edges to ensure complete coverage. The armouring process is monitored to ensure proper tension and overlap, which are critical for the armouring’s effectiveness.

Sheath Extrusion: Finally, the Armoured Core is passed through another extruder, where the outer PVC sheath is applied. The sheath is extruded at a controlled temperature and speed to ensure a uniform thickness of 1.8mm and good adhesion to the armouring. The extruded cable is then cooled in a water bath to solidify the sheath.

Throughout the manufacturing process, rigorous quality control tests are performed to ensure the cable meets specifications:

Conductor Tests: Each batch of copper conductors is tested for conductivity, tensile strength, and elongation to ensure they meet the required standards.

Insulation Tests: The XLPE insulation is tested for thickness, eccentricity, dielectric strength, and insulation resistance. Samples are also subjected to thermal aging tests to verify long-term performance.

Armouring Tests: The steel tape armouring is inspected for thickness, adhesion, and coverage to ensure it provides adequate protection.

Sheath Tests: The PVC sheath is tested for thickness, tensile strength, elongation, and resistance to UV radiation and chemicals.

Electrical Tests: Finished cables undergo tests for conductor resistance, insulation resistance, dielectric strength, and short-circuit withstand capacity.

Mechanical Tests: Samples of the finished cable are tested for bending, impact, and crush resistance to ensure they can withstand installation and operational stresses.

These quality control measures ensure that each YJY23-0.6/1kV 3×25mm² cable meets the highest standards of performance and reliability.

II. General Product Information

1. Packaging Specifications

The YJY23-0.6/1kV 3×25mm² cable is packaged to ensure it arrives at the customer’s location in perfect condition, protected from damage during transportation and storage.

For standard lengths (100m, 250m, and 500m), the cable is wound onto wooden or steel reels. Wooden reels are made from treated timber to prevent rot and insect infestation, complying with ISPM 15 standards for international shipments. Steel reels are used for heavier loads or when greater durability is required. The reels are designed with flanges to prevent the cable from slipping off during transportation, with flange diameters ranging from 600mm for 100m reels to 1200mm for 500m reels.

The cable is wound tightly onto the reels to prevent loosening and damage, with a layer of moisture-resistant plastic film wrapped around the wound cable to protect it from dust and moisture. For additional protection, especially for international shipments, the reels are often placed in wooden crates or metal cages, which provide further protection against impact and handling damage.

Each reel or crate is clearly labeled with the following information:

Product name and type (YJY23-0.6/1kV 3×25mm²)

Length of the cable

Net weight and gross weight

Manufacturer’s name and logo

Batch number and production date

Handling instructions ("This Side Up," "Do Not Drop," "Use Crane")

Compliance marks and certifications (e.g., CE, IEC)

For smaller quantities or custom lengths, the cable may be cut to size and packaged in heavy-duty cardboard boxes, with the cable coiled and secured to prevent tangling. These boxes also include the same labeling information as the reels.

2. Transportation and Logistics

The YJY23-0.6/1kV 3×25mm² cable is classified as a non-hazardous product for transportation, which simplifies logistics and reduces shipping costs. It can be transported via road, rail, sea, or air, depending on the destination, quantity, and urgency of the order.

Road Transport: For domestic shipments, road transport is the most common and cost-effective option. The cable reels are loaded onto trucks using forklifts or cranes, with securing straps used to prevent movement during transit. Delivery times typically range from 1 to 5 business days, depending on the distance from the manufacturing facility.

Rail Transport: For larger quantities or longer domestic distances, rail transport may be used. This is particularly suitable for shipments to remote areas or when road transport is impractical. Rail transport offers reliable delivery times, typically 3 to 7 business days, and can handle larger loads than road transport.

Sea Transport: For international shipments, sea transport is the most economical option, especially for large quantities. The cable reels are loaded into shipping containers, with proper securing to prevent movement during the voyage. Transit times vary depending on the destination, ranging from 2 to 6 weeks for most major ports. For shipments to countries with strict import regulations, additional documentation (such as certificates of conformity and material safety data sheets) may be required.

Air Transport: For urgent orders, air transport is available, though it is significantly more expensive than sea transport. Air freight is suitable for small quantities or when time is critical, with delivery times ranging from 3 to 7 business days. The cable reels must be packaged to meet airline regulations for size and weight.

During transportation, it is important to protect the cable from extreme temperatures, moisture, and physical damage. The packaging is designed to withstand these conditions, but additional precautions may be taken for sensitive shipments, such as using climate-controlled containers for long sea voyages or covering reels with tarpaulins during road transport in inclement weather.

3. Order Processing and Delivery

The order processing for the YJY23-0.6/1kV 3×25mm² cable is designed to be efficient and customer-friendly, with a dedicated sales team available to assist with inquiries and order placement.

Order Placement: Customers can place orders via phone, email, or through the manufacturer’s online portal. The sales team works closely with customers to confirm specifications, including length, quantity, and any custom requirements, ensuring accuracy before processing.
Order Confirmation: Once an order is placed, customers receive a confirmation email within 24 hours, outlining the order details, pricing, delivery timeline, and payment terms. This document serves as a formal agreement and includes a unique order reference number for tracking.

Production Scheduling: Standard orders (up to 5,000 meters) are scheduled for production within 1–2 business days. For larger quantities or custom configurations, lead times may extend to 3–5 business days, with the sales team providing regular updates on production progress.

Dispatch and Tracking: Upon completion, the cable is packaged and dispatched via the customer’s preferred logistics method. A shipping confirmation is sent with a tracking number, allowing customers to monitor the shipment’s journey in real time through the carrier’s online platform.

Delivery and Receipt: Delivery times vary by location and shipping method, as outlined in the transportation section. Upon receipt, customers are advised to inspect the packaging for damage and confirm the cable length and condition match the order details. Any discrepancies should be reported to the manufacturer within 48 hours of delivery.

4. Sample Policy

To assist customers in evaluating the YJY23-0.6/1kV 3×25mm² cable before placing bulk orders, the manufacturer offers a flexible sample policy:

Sample Availability: Standard samples are 1–2 meter lengths of the cable, provided free of charge. These samples include all core features (stranded copper conductors, XLPE insulation, steel armouring, and PVC sheath) to showcase material quality and construction.

Request Process: Samples can be requested via email, phone, or the manufacturer’s website. Customers need only provide their shipping details and intended application, allowing the sales team to tailor samples to specific needs if required.

Shipping Costs: While samples are complimentary, customers are responsible for shipping fees. For international requests, the manufacturer coordinates with preferred couriers to offer competitive rates, with tracking information provided upon dispatch.

Custom Samples: For unique requirements (e.g., alternative sheath colors or specialized armouring), custom samples may be produced for a nominal fee, which is refundable upon placement of a bulk order exceeding 1,000 meters.

5. Warranty and After-Sales Support

The YJY23-0.6/1kV 3×25mm² cable is backed by a comprehensive warranty and after-sales program, ensuring customer confidence and long-term reliability:

Warranty Coverage: The cable comes with a 10-year warranty against manufacturing defects, including issues with conductor conductivity, insulation integrity, armouring adhesion, and sheath durability. The warranty is valid under normal operating conditions and proper installation as per the manufacturer’s guidelines.

Claims Process: To file a warranty claim, customers must provide the order reference number, proof of purchase, and detailed documentation of the defect (including photographs or test reports). The technical team reviews claims within 3–5 business days, with resolutions ranging from replacement to repair, depending on the issue.

Technical Support: A dedicated team of engineers is available to assist with installation guidance, troubleshooting, and application advice. Support is accessible via phone, email, or video consultation, with response times guaranteed within 24 hours for urgent inquiries.

Installation Resources: The manufacturer provides detailed installation manuals, which include guidelines on bending radii, termination procedures, and compatibility with connectors. These resources are available for download on the website, along with video tutorials for visual reference.

On-Site Assistance: For large-scale projects or complex installations, the manufacturer offers on-site support for a fee. Technical representatives can visit the site to inspect cable routing, verify installation practices, and address any challenges, ensuring optimal performance and compliance with safety standards.

6. Storage and Handling Guidelines

Proper storage and handling are critical to maintaining the cable’s performance and longevity:

Storage Conditions: The cable should be stored in a dry, well-ventilated area away from direct sunlight, extreme temperatures, and corrosive substances. Reels should be placed on flat surfaces, with wooden blocks inserted between flanges to prevent rolling. For long-term storage (exceeding 6 months), the cable should be re-wound periodically to avoid permanent creasing.

Handling Practices: When moving reels, use forklifts or cranes with appropriate lifting equipment (e.g., reel hooks or slings) to avoid damaging flanges. Manual handling of short lengths should be done with gloves to prevent cuts from sharp edges and to avoid contamination of the sheath.

Installation Precautions: During installation, avoid dragging the cable over rough surfaces, which can abrade the sheath. Pulling tension should not exceed 1.5kN to prevent conductor damage, and bending should be done gradually to avoid exceeding the minimum radius. Termination should be performed using tools designed for XLPE-Insulated Cables to ensure proper sealing and electrical contact.

Weather Protection: If installed outdoors before termination, exposed ends should be sealed with waterproof caps to prevent moisture ingress. Unused portions of the cable should be covered with tarpaulins to protect against rain, snow, or UV exposure.

Conclusion

The YJY23-0.6/1kV 3×25mm² armoured power cable stands out as a robust, reliable solution for low-voltage power distribution in demanding environments. Its combination of high-purity copper conductors, XLPE insulation, double steel armouring, and PVC sheath delivers exceptional performance in terms of conductivity, mechanical protection, and resistance to environmental stressors.

From industrial facilities to infrastructure projects, its versatility and compliance with global standards make it a preferred choice for engineers and contractors seeking long-term reliability. Supported by comprehensive packaging, efficient logistics, and responsive after-sales service, the cable ensures seamless integration into diverse applications, backed by the manufacturer’s commitment to quality and customer satisfaction. Whether installed underground, in cable trays, or outdoors, the YJY23-0.6/1kV 3×25mm² cable remains a trusted asset for safe, efficient power transmission.