The YJV22 3×240+1×120 0.6/1kV is a large-section, four-core, low-voltage steel-tape armored power cable designed for heavy-duty three-phase, four-wire AC 0.6/1kV, 50Hz power distribution systems. It features high-purity compacted copper conductors, cross-linked polyethylene (XLPE) insulation, a PVC inner sheath, double-layer hot-dip galvanized steel tape armor, and a high-strength modified PVC outer sheath.

The configuration of three 240mm² main cores and one 120mm² neutral core is specifically tailored for three-phase power supply systems with unbalanced loads and high current demands. Unlike smaller- and medium-sized YJV22 cables, this model emphasizes high current-carrying capacity, stable overload performance, excellent mechanical protection, and long-distance transmission capability. It is widely used as the backbone line in industrial parks, large manufacturing workshops, high-rise building complexes, key municipal projects, and commercial complexes.

Thanks to its reliable copper conductor material, mature structural design, and stringent production standards, this cable is the preferred specification for electrical engineers designing heavy-duty circuits and a mainstream choice for bulk purchases by contractors and project owners with high requirements for power supply reliability and service life. It can operate stably under various fixed installation conditions such as direct burial, cable trenches, and cable trays, as well as in complex working environments.

• Main Conductor (3 cores): 240mm² compacted stranded high-purity copper wire, low resistivity, good conductivity, strong mechanical toughness, and strong resistance to thermal deformation under long-term high-current operation.
• Neutral Conductor (1 core): 120mm² compacted stranded copper wire, with a reasonably matched cross-section, capable of withstanding unbalanced current and ensuring the stability of the three-phase circuit.
• XLPE Insulation Layer: High-density cross-linked polyethylene, uniform insulation thickness, high dielectric strength, low dielectric loss, and excellent heat aging resistance.
• Inner Sheath: Flexible PVC compound, filling the gaps between the core wires, isolating the insulation layer from the armor layer, and preventing friction damage and moisture penetration.
• Steel Tape Armor: Double-layer hot-dip galvanized steel tape, completely wrapping the core, providing strong compressive, impact, and tensile strength; galvanizing treatment effectively prevents corrosion in humid environments.
• Outer Sheath: Reinforced modified PVC, enhancing abrasion resistance, weather resistance, and moderate chemical corrosion resistance, protecting the entire cable from external corrosion.

Rated Voltage:

0.6/1kV (Uo/U), Power Frequency: 50Hz

Maximum Continuous Operating Temperature of Conductor:

90°C

Maximum Short-Circuit Withstand Temperature:

250°C, duration not exceeding 5 seconds

Core Wire Specifications:

3×240mm² + 1×120mm²

Minimum Bending Radius:

Static fixed laying ≥ 12 × cable outer diameter; Temporary mobile laying length ≥ 15 times cable outer diameter

Permissible Ambient Temperature:

≥0°C

Operating Ambient Temperature Range:

-20°C～+70°C

Power Frequency Withstand Voltage:

3.5kV, withstands 5 minutes without breakdown

Insulation Resistance:

Extremely high insulation value, stable insulation performance over long-term operation

Current Carrying Capacity:

High rated current, suitable for three-phase heavy-load equipment and long-distance power transmission

Waterproof Performance:

Fully sealed integrated structure, suitable for long-term laying environments in damp underground and cable trenches

Mechanical Properties:

Can withstand heavy soil compression, external impact, and construction traction force

Product manufacturing and testing fully comply with the GB/T 12706 national standard. All performance indicators have passed third-party professional testing and fully meet the acceptance requirements of large-scale industrial projects, high-rise buildings, and key municipal projects. For projects with higher fire protection requirements, a flame-retardant version is available.

This large cross-section (3×240+1×120) specification is mainly used in three-phase four-wire heavy-load main circuits. We categorize application scenarios according to project type, laying method, and load characteristics to facilitate accurate selection:

1. 4.1 Main Power Supply Lines for Industrial Parks and Heavy-Duty Factories

   Serving as the main incoming and outgoing lines for the main distribution rooms and sub-distribution boxes in factories. Widely used in machinery manufacturing, metallurgy, chemical, and building materials industries, equipped with large motors, production lines, and heavy equipment. The armored structure resists workshop vibration, mechanical collisions, and dust, and its high current-carrying capacity meets the power demands of centralized high-power equipment.

2. 4.2 High-Rise Buildings and Large Commercial Complexes

   Used as the vertical main riser, underground main distribution line, and floor-level main power supply circuit in high-rise residential buildings, large shopping malls, office buildings, and convention centers. Powering elevators, central air conditioning, fire protection systems, lighting, and other comprehensive electrical facilities. Stable operation ensures continuous power supply for high-density high-rise buildings.

3. 4.4 Key Municipal Infrastructure and Public Utilities

   Suitable for main power distribution lines in water plants, sewage treatment plants, urban integrated pumping stations, transportation hub supporting facilities, and large public service stations. Adaptable to all-weather outdoor environments and humid working conditions for municipal facilities; complete qualification documents simplify project bidding and acceptance processes.

4. 4.4 Urban Power Grid and Community Centralized Power Distribution

   Used as regional power distribution trunk lines in new urban areas, large residential communities, and suburban power grid expansion projects. Direct burial and cable trench laying are the mainstream methods. Robust mechanical protection measures can prevent cable damage caused by road reconstruction and geological changes.

5. 4.5 Logistics Parks, Cold Storage, and Large Warehousing Clusters

   Deployed in large logistics hubs, intelligent warehouses, and cold storage parks as main power distribution lines. Adaptable to environments with large temperature differences, high humidity, and frequent vehicle operations. Reliable performance ensures the normal operation of refrigeration equipment, handling machinery, and monitoring and security systems.

6. 4.6 Long-Distance Fixed Laying Projects

   Suitable for long-distance power transmission between multiple buildings and regional centralized power supply projects. The low voltage drop of copper conductors effectively solves the power attenuation problem in long-distance cabling, and the armored structure reduces potential failures during long-term buried operation.

1. 5.1 High Current Carrying Capacity and Excellent Transmission Performance

   The 240mm² large cross-sectional area copper core has low resistivity and a large overload margin. Under the same laying conditions, it can stably carry large three-phase operating currents with low temperature rise during full-load operation. The matching 120mm² neutral core effectively balances unbalanced three-phase currents, avoids neutral overheating, and ensures the safe and stable operation of the entire power distribution system.

2. 5.2 Excellent Insulation Performance and Long-Term Anti-Aging Capacity

   The high-quality cross-linked polyethylene (XLPE) insulation layer has a uniform structure and strong dielectric stability. Even after decades of continuous operation, there will be no problems such as insulation aging, cracking, or performance degradation. Low dielectric loss reduces power transmission loss, enabling energy-saving operation of heavy-load circuits during long-term operation.

3. 5.3 Comprehensive Enhanced Mechanical Protection

   Double-layer galvanized steel strip fully wraps the cable core. It can withstand strong external compression, impact, friction, and tension during construction and operation. Even when buried in gravelly soil and road backfill layers, the internal conductors and insulation layers are fully protected. Galvanized steel strips prevent rust and corrosion in humid environments, thus maintaining long-lasting protection.

4. Excellent Environmental Adaptability

   The reinforced PVC outer sheath offers superior wear resistance, weather resistance, and aging resistance. It can operate normally year-round in environments with high temperatures, low temperatures, high humidity, and dust, and exhibits some tolerance to weak acids and alkalis in the soil. It can adapt to various complex climates and geological conditions in different regions.

5. 5.5 High Operational Safety and Low Failure Rate

   The copper conductor has stable thermal properties, preventing the connection terminals from overheating and loosening. Combined with a sealed structure and high-performance insulation, the cable effectively reduces faults such as short circuits, leakage, and breakdown. For high-load trunk lines requiring uninterrupted power supply, it significantly improves the overall safety of the power system.

6. 5.6 Reasonable Core Wire Matching and Strong Circuit Adaptability

   The 3×240+1×120 design conforms to the load characteristics of conventional three-phase four-wire distribution systems. The neutral conductor cross-section is scientifically matched, reasonably controlling material costs while fully absorbing unbalanced current. It is compatible with most three-phase distribution design standards in the field, exhibiting strong versatility.

7. Mature supporting accessories and efficient construction performance

   This is a widely used large-section standard cable, compatible with mainstream copper terminals, cable connectors, and auxiliary accessories on the market. The cable has moderate flexibility, facilitating installation in large cable trenches, bridges, and vertical shafts, effectively improving the progress of large-scale engineering cabling.
   
   
   

1. 6.1 Engineering Design and Selection Guidelines
   1. Voltage Application Range: This cable is only suitable for 0.6/1kV low-voltage three-phase four-wire systems and is prohibited for medium and high-voltage power systems.
   2. Load Matching: For circuits with high rated current, high load power, and significant three-phase imbalance, this cable specification should be given priority; the current carrying capacity and voltage drop should be strictly calculated based on the transmission distance and the number of cables laid.
   3. Laying Layout: When multiple large-section cables are laid side-by-side in cable trays or densely buried, the current carrying capacity should be appropriately reduced, and sufficient heat dissipation space should be reserved to avoid heat accumulation.
   4. Environmental Differentiation: For coastal salt spray areas, highly corrosive workshops, and key fire-fighting areas, corrosion-resistant or flame-retardant reinforced cables should be selected instead of standard types.
2. On-site Laying and Construction Specifications
   1. Construction Temperature: Do not lay cables when the ambient temperature is below 0℃ to avoid brittle cracking of the sheath and insulation.
   2. Bending Control: This large-section cable has high rigidity. Strictly adhere to the specified minimum bending radius during installation, avoiding sharp bends and severe compression to prevent core deformation and insulation damage.
   3. Traction Construction: Use professional traction tools during laying to maintain uniform stress and control the traction force within allowable limits to prevent conductor breakage and armor displacement.
   4. Direct Burial Requirements: Lay a thick layer of fine sand at the top and bottom of the cable, and cover it with a concrete protective slab to isolate it from sharp objects.
   5. Terminal Production: Use dedicated large-size copper terminals. If necessary, employ a double process of crimping and welding, and ensure proper sealing to eliminate the risk of localized overheating at the joint.
3. Procurement, Acceptance, and Warehousing Management
   1. Document Review: During the procurement process, check complete product qualification certificates, factory test reports, type test reports, and parameter tables to confirm compliance with national standards.
   2. Visual Inspection: Inspect the cable appearance for cracks, scratches, uneven outer diameter, and incomplete printing markings; verify the accuracy of the model, voltage, and core wire specifications.
   3. Sampling Inspection: For large orders, conduct random sampling according to project acceptance standards to test insulation resistance, power frequency withstand voltage, and sheath integrity.
   4. Storage Rules: Place cables on large dedicated cable reels and store them in a dry, ventilated, and cool warehouse. Keep away from open flames, chemicals, and groundwater; long-term open-air storage is prohibited.
   5. Inventory Management: Arrange shipments in batches according to the construction schedule to avoid long-term static storage of large-section cables and prevent sheath aging and deformation.

1. Case 1: Main Power Line Project in a Large Machinery Manufacturing Plant

   A heavy machinery manufacturing plant uses a large quantity of YJV22 3×240+1×120 cables as the main power supply line for its workshops. The plant is equipped with multiple large pieces of machinery, resulting in a large total load and frequent equipment starts. Under long-term full-load operation, the cable maintained stable current transmission, and its armored structure resisted workshop vibrations and impacts. After nine years of operation, no major electrical failures occurred, fully ensuring the continuity of production.

2. Case 2: Power Supply Project for a High-Rise Residential Community

   A large high-rise residential community uses this cable specification as the underground incoming line and the main riser line for its buildings. Despite the complex laying path and dense pipeline layout, the cable's reliable performance passed fire safety and engineering acceptance inspections. The low failure rate significantly reduced the daily maintenance workload for property management.

3. Integrated Industrial Park Power Distribution Project

   An 800,000 square meter integrated industrial park selected YJV22 3×240+1×120 cable as the main line connecting the main substation and various factory areas. The laying method combined direct burial and cable-stayed bridge installations. This cable is adaptable to complex geological conditions and outdoor environments, and its reasonable core configuration effectively solved the problem of three-phase unbalanced loads within the park.

4. Case 4: Urban Wastewater Treatment Plant Renovation Project

   A large municipal wastewater treatment plant underwent a power system upgrade and renovation, selecting this cable as its main power distribution line. The long-term high-humidity working environment placed high demands on the cable's sealing and rust-proof performance. The galvanized armor and sealed structure enabled it to stably resist moisture corrosion, and all certification documents met the stringent acceptance standards for municipal engineering.

5. Case 5: Large Cold Storage Logistics Park Project

   A regional integrated logistics cold storage park used this cable as its overall main power line. The park environment experiences large temperature differences and high humidity throughout the year. This cable maintains stable electrical performance under alternating hot and cold conditions, providing reliable power supply for refrigeration units, handling equipment, and supporting facilities.

   

1. 8.1 High-Quality Raw Materials and Strict End-to-End Quality Control

   We use high-purity electrolytic copper and high-quality XLPE and PVC raw materials. Equipped with automated production lines and online real-time monitoring equipment, we conduct multi-stage inspections throughout the entire production process, from raw material warehousing to finished product delivery. Each roll of large-section cable undergoes rigorous electrical performance testing before delivery to ensure consistent quality across batches.

2. 8.2 Standard Specifications and Stable Batch Supply

   We maintain ample inventory of this standard heavy-duty cable, supporting large-volume spot delivery and phased supply for large projects. We maintain stable production capacity to ensure a continuous supply of materials for long-cycle projects.

3. 8.3 Professional Customization and Supporting Services

   Based on standard products, we offer customization services according to project requirements, such as length cutting, special printing markings, reinforced sheathing, and flame-retardant treatment. We also provide a one-stop supply of matching large-size copper terminals, connectors, and laying accessories.

4. 8.4 Full-Cycle Professional Technical Support

   Our senior electrical engineers provide free pre-sales load calculations, voltage drop analysis, and laying scheme optimization services. During construction, we offer remote guidance and on-site technical support to help the engineering team solve challenges related to large-section cable laying, terminal production, and layout.

5. 8.5 Timely Delivery and Standardized Packaging

   We use export-grade wooden rolls to package large-section cables to prevent damage during transportation. For bulk orders, we develop customized delivery plans to ensure timely material delivery and avoid delays due to material shortages.

6. 8.6 Complete Compliance Documentation for Convenient Acceptance

   We can provide a complete set of official documents, including qualification certificates, a full range of test reports, and standards compliance declarations. All documents are officially valid and fully meet the requirements for project bidding, filing, and acceptance, saving the purchaser's document preparation time.

7. 8.7 Comprehensive Long-Term After-Sales Service

   We establish dedicated project files for large-scale engineering orders. Our after-sales team continuously monitors product operation status, efficiently responds to technical inquiries and product feedback, and provides comprehensive service support throughout the cable's entire lifespan.