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Code Symbol
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Full Definition
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Engineering Practical Value for Design & Procurement
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YJ
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Cross-Linked Polyethylene (XLPE) Insulation
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High thermal stability, low dielectric loss, long-term 90℃ continuous operation, superior aging resistance vs conventional PVC insulation
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V
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PVC Inner Bedding Sheath
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Smooth buffer layer to separate core assembly and armor, prevent armor wire abrasion on insulation structure under tensile deformation
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32
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Galvanized Fine Steel Wire Helical Armored Layer (Core Differentiator from YJV22)
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Mainly bears axial tensile force, resists pulling stress during vertical pulling, sloped terrain settlement and long-distance hoisting laying; also withstands radial extrusion and impact damage
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Outer V
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PVC Outer Protective Sheath
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Moisture-proof, anti-aging, oil resistant, acid & alkali corrosion resistance, blocks soil, groundwater and chemical erosion for underground buried installation
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Classification of derivative models based on specific engineering requirements
- YJV32: Standard steel-wire armored power cable; suitable for general tensile-load applications and direct underground burial.
- ZR-YJV32: Flame-retardant version of YJV32; meets wiring requirements for fire compartments in public buildings and commercial complexes.
- NH-YJV32: Fire-resistant version of YJV32; specifically designed for emergency power circuits serving fire pumps, smoke exhaust systems, and similar equipment.
- WDZ-YJV32: Low-smoke, zero-halogen (LSZH), flame-retardant version of YJV32; suitable for subways, underground utility tunnels, and densely populated enclosed buildings.
Detailed Internal Structure (from inside out)
- Conductor: High-purity oxygen-free annealed copper, Class 2 compacted stranded construction, copper purity ≥99.95%; standard cross-sectional area range: 10mm² to 630mm² (see specifications list for details)
- Semi-conductive inner screen: Eliminates electric field concentration at the conductor surface, ensuring a safety margin for long-term insulation performance
- Extruded XLPE insulation: Uniform and controllable wall thickness, stable insulation resistance, and excellent heat and crack resistance
- Insulated core color coding: Distinct core colors facilitate phase identification, on-site wiring checks, and subsequent maintenance or troubleshooting
- Non-hygroscopic PP filler: Fills gaps between cores to form a regular circular cable profile, preventing core displacement during cabling, armoring, and extrusion processes
- Binding tape: Wraps the assembled cable core, protecting the insulation layer from damage during the steel wire armoring process
- PVC inner bedding: Isolates the cable core from the armor layer and cushions against compression and friction during tensile deformation
- Helical galvanized steel wire armor: Continuous, uniform winding structure; serves as the primary load-bearing component, offering resistance to crushing, impact, and rodent damage
- Tightly extruded PVC outer sheath: Abrasion-resistant, UV-resistant, and waterproof; suitable for fixed installation in underground, damp, and semi-outdoor environments
2. Comprehensive Technical Specifications (Key reference for design engineers and procurement/inspection personnel)
Electrical Performance Indicators
- Rated operating voltage: U0/U = 0.6/1 kV; suitable for 50 Hz AC low-voltage power distribution systems
- Power-frequency withstand voltage test: 3500 V; no insulation breakdown over a 5-minute duration
- Conductor DC resistance at 20°C: Fully compliant with GB/T 3956 standards; strictly controlled to minimize excessive voltage drop and line losses during long-distance power transmission
- Insulation resistance at ambient temperature: ≥100 MΩ·km; ensures an adequate safety margin for insulation during continuous full-load operation
- Short-circuit temperature limits: Maximum instantaneous conductor temperature ≤250°C; maximum short-circuit duration ≤5 seconds
Temperature and Environmental Adaptability Parameters
- Maximum continuous operating temperature of conductor: ≤90°C; features excellent overload capacity and resistance to thermal aging
- Minimum installation ambient temperature: ≥0°C; preheating is required for installation below 0°C to prevent sheath embrittlement or cracking
- Storage temperature range: -20°C to +50°C; prolonged exposure to rain or direct sunlight is strictly prohibited
- Environmental adaptability: Resistant to corrosion from moist soil, mild salinity/alkalinity, and trace chemical vapors; suitable for low-lying areas subject to seasonal water accumulation
Mechanical and Installation Parameters
- Minimum bending radius (multi-core YJV32): ≥15 times the cable outer diameter
- Minimum bending radius (single-core YJV32): ≥20 times the cable outer diameter
- Tensile characteristics: Capable of withstanding moderate axial tensile stress; suitable for vertical suspension, steep slopes, and areas prone to ground settlement; YJV22 steel-tape armored cables are not suitable for withstanding high tensile loads
- Standard core configurations: 1, 2, 3, 3+1, 3+2, 4, 4+1, and 5 cores; customization of non-standard core configurations is available based on specific project drawing requirements
3. Unique Core Competitive Advantages and Significant Differences from YJV22 Steel-Tape Armored Cable
3.1 Superior Tensile Load-Bearing Capacity: Solving Challenges in Vertical and Inclined Installations
YJV22 steel-tape armor is designed to withstand only radial crushing and impact forces; it cannot bear axial tensile loads. When subjected to long-distance vertical suspension or tension caused by ground subsidence, the steel tape is prone to snapping, thereby losing its protective function. In contrast, the YJV32 utilizes a helical steel-wire armor structure that evenly distributes axial tensile stress, preventing armor breakage and damage to internal cores. Consequently, it is the specified model for installations involving high-drop vertical shafts, hillsides, and overhead or direct-buried crossings over rivers.
3.2 Integrated Dual Mechanical Protection: Crush and Tensile Resistance
Steel-wire armor provides simultaneous protection against both external crushing forces and tensile forces. In underground construction environments—facing risks such as uneven foundations, sharp rocks in backfill, vehicle traffic, and ground subsidence—the YJV32 effectively prevents sheath punctures, insulation deformation due to crushing, and conductor breakage. This significantly reduces the frequency of line inspection and maintenance required by project owners and general contractors after project handover.
3.3 XLPE Insulation Ensures Long Service Life and Stable Thermal Performance
Cross-linked polyethylene (XLPE) insulation offers superior resistance to high temperatures, oxidative aging, and thermal deformation, significantly outperforming PVC-insulated armored cables. Under proper installation and rated load conditions, the cable boasts a design service life of up to 30 years, thereby reducing capital expenditure on periodic cable replacement and retrofitting for long-term operational projects such as mines, wind farms, and tunnel infrastructure.
3.4 Diverse Specification Upgrades to Meet Varied Fire Safety and Environmental Design Requirements
A wide range of customizable structural specifications is available to meet the acceptance standards and technical requirements of different projects:
- ZR-YJV32 (Flame-retardant type): Suitable for main power lines within fire compartments of shopping malls, office buildings, and residential complexes.
- NH-YJV32 (Fire-resistant type): Suitable for dedicated vertical shaft lines providing emergency backup power to equipment such as fire pumps, smoke exhaust fans, and fire shutters.
- WDZ-YJV32 (Low-smoke, zero-halogen type): Suitable for power distribution systems in subways, underground utility tunnels, hospitals, and densely populated enclosed public buildings.
- Customized Anti-termite and Anti-corrosion Sheath YJV32: Suitable for challenging environments such as coastal saline soils, chemical industrial parks, and areas with severe rodent infestations.
3.5 Superior Adaptability to Complex Geological Conditions and Low-Lying, Water-Prone Terrain
For low-lying areas prone to seasonal flooding, river crossings, and zones subject to underground foundation settlement, the YJV32 cable utilizes a tensile-resistant structure to effectively counteract cable stretching caused by ground displacement. This prevents intermittent circuit faults and insulation failure due to water ingress, ensuring higher long-term operational stability compared to conventional YJV22 armored cables.
4. Application Scenarios (Quick Selection Guide for Engineers)
New Energy Projects (Wind and Photovoltaic Power Plants)
- Long-distance vertical power cabling within wind turbine towers in mountainous areas; buried trunk lines connecting photovoltaic combiner boxes on hillsides; cable trench installations in sloped areas prone to ground settlement; and power distribution circuits for vertical shaft entry/exit lines at step-up substations.
Tunnels, Subways, and Municipal Transport Infrastructure
- Main power supply lines for long highway tunnels; power distribution cables in subway station shafts; buried lines crossing beneath roadways; river-crossing power transmission lines installed via pipe jacking; and long-distance vertical circuits within underground utility tunnels.
Power Distribution for Mines, Quarries, and Heavy Industrial Sites
- Power supply wiring for inclined ramps and shafts in underground mines; buried power cables in quarries with uneven foundation conditions; circuits laid in backfilled deep excavation zones at industrial plants; and long-distance fixed transmission lines for heavy equipment in areas prone to ground settlement.
MEP Systems for Super-high-rise Buildings and Large-scale Complexes
- Main riser cables in electrical shafts of super-high-rise buildings; buried power distribution lines in deep basement excavations; dedicated vertical circuits for fire emergency power supplies; and underground power wiring in areas of large shopping malls susceptible to foundation settlement.
Municipal engineering projects involving river crossings, low-lying areas prone to water accumulation, and complex geological conditions.
- Typical cases include: underground pipe-jacking projects for river-crossing power cables; municipal roadway lighting trunk line projects in low-lying areas susceptible to seasonal flooding; underground power distribution line projects in coastal saline-alkali regions; and grid renovation projects for mountain villages prone to geological displacement.
5. Practical Engineering Application Cases (intended to boost client confidence and serve as a reference for bidding)
Case 1: Power distribution infrastructure project for 33 wind turbine units at a mountain wind farm.
Project Requirements: Involved vertical cable laying inside turbine towers and underground trunk line installation on steep slopes; cables needed to withstand long-term tensile stress caused by turbine operation and minor foundation settlement; conventional YJV22 cables were prone to armoring layer cracking and failure.
Implementation Solution: Utilized YJV32 tensile-resistant armored power cables (specifications: 95mm² and 120mm²); total supply: 219,700 meters.
Project Outcome: Successfully passed the completion acceptance inspection by the electric power design institute and the grid company; after three years of continuous operation, no armoring deformation or internal circuit faults occurred, and power transmission from all units remained stable; the project received high praise from the renewable energy EPC contractor and the supervision team.
Case Study 2: Electromechanical Ancillary Works for an Extra-Long Highway Tunnel
Project Requirements: The project required the installation of long-distance, longitudinally buried power trunk lines within the tunnel, including sections routed upwards through vertical shafts. Due to the risk of crushing from backfill stones within the cable trenches, the cables needed to possess high compressive and tensile strength.
Solution Implemented: A combination of YJV32 multi-core trunk cables and small-cross-section YJV32 branch cables was installed, with a total ordered length of 168,400 meters.
Project Outcome: The tunnel's electromechanical system successfully passed final acceptance inspection. No insulation damage or sheath punctures occurred during either the installation phase or long-term operation; this avoided potential future costs associated with tunnel excavation and repairs, earning high praise from municipal engineering authorities.
Case Study 3: Vertical Electrical Shaft Project for a 62-Story Super-High-Rise Office Building
Project Requirements: Main power supply lines for an exceptionally long vertical shaft; cables required to withstand immense tensile stress from their own weight during installation and meet backup requirements for fire emergency power supplies.
Solution Implemented: NH-YJV32 fire-resistant, tensile-resistant armored trunk cables (185mm² and 240mm²); total supply volume: 97,600 meters.
Project Outcome: Successfully passed fire safety and electrical system acceptance inspections; building power system operates stably at full load; zero quality complaints post-delivery; established a long-term, stable partnership with the developer.
6. Production Standards and Global Compliance Certifications (Documentation required for tendering, acceptance, and export customs clearance)
Domestic Production Standards
- GB/T 12706.1-2020 Power cables with extruded insulation and their accessories for rated voltages from 1 kV to 35 kV – Part 1: Cables for rated voltages of 1 kV and 3 kV
- GB/T 3956 Conductors of cables
- GB/T 18380 Test on vertical flame spread of vertically-mounted bunched wires or cables
- GB/T 12666 Test methods for flame-retardant and fire-resistant cables
Export certification (applicable to tendering and export customs clearance in African, Southeast Asian, Middle Eastern, and Latin American markets)
- CCC (China Compulsory Certification) for standard civil and industrial-grade products
- CE certification in compliance with the EU Low Voltage Directive (2014/35/EU)
- ISO 9001 (Quality Management), ISO 14001 (Environmental Management), and ISO 45001 (Occupational Health and Safety Management) certifications
- Provision of factory inspection reports, raw material traceability certificates, and dimensional and electrical performance test reports with each batch
- Provision of customized IEC 60502 standard test documentation and qualification materials required for local market tendering and registration, tailored to the client's region
7. Key advantages of purchasing our YJV32 steel-wire armored cables
Strict incoming raw material inspection to eliminate potential quality issues later in the project
All raw materials—including copper rods, galvanized steel wires, and XLPE (cross-linked polyethylene) resin—are sourced from fully qualified, reputable large-scale smelters and chemical enterprises. Prior to production, comprehensive incoming inspections are conducted on copper purity, steel wire tensile strength, insulation formula stability, and the consistency of armor wrapping density. We strictly prohibit the use of recycled copper, substandard steel wire, or recycled plastics. This effectively prevents issues such as excessive conductor resistance, armor breakage, sheath cracking, and insulation breakdown, thereby helping buyers avoid the risks of project rework, rectification, and claims arising from substandard cables.
Flexible customization to meet specific project technical requirements
We support customized conductor cross-sections and non-standard core counts, offering enhanced structural features such as flame retardancy, fire resistance, Low Smoke Zero Halogen (LSZH) properties, and termite/corrosion resistance. Sheath color, surface printing, and length marking methods can all be tailored to client construction drawings and tender specifications. Sample reels are available for preliminary tensile strength testing, enabling design institutes and engineering firms to verify product performance prior to formal bidding.
Direct-from-manufacturer model to maximize project gross margins
Eliminates intermediary markups; unit prices are negotiable for large-volume orders; and reasonable Minimum Order Quantities (MOQs) are set to accommodate the purchasing needs of small- and medium-sized electrical contractors. For major overseas clients, we offer Less-than-Container Load (LCL) and cargo consolidation solutions to effectively reduce overall ocean freight and logistics costs.
Full-lifecycle technical support tailored for electrical engineers
- Expert electrical engineering team providing services such as tensile load calculations, ampacity and line loss analysis, product selection recommendations, optimization of vertical/inclined installation plans, and preparation of technical specifications for tenders
- Provision of official technical data sheets, cable dimension drawings, tensile parameter test reports, and on-site wiring guides for drawing review and approval submissions
- Transparent production progress tracking and comprehensive pre-shipment testing (covering both electrical and mechanical performance) to ensure on-time delivery for urgent tender projects
- Remote technical consultation to assist with installation and troubleshooting for overseas projects
Export-standard packaging and comprehensive customs documentation
Packaging utilizes export-grade wooden cable reels featuring internal moisture-proof wrapping and external impact-resistant reinforcement; the reel structure is specially strengthened to withstand long-distance, cross-border multimodal (sea and land) transport of heavy armored cables. A full set of documents—including packing lists, commercial invoices, certificates of origin, and other customs clearance paperwork—is provided to streamline the export declaration process for international buyers.
8. Key considerations for engineering selection and on-site installation (mitigating design flaws and construction errors; specific notes for YJV32)
- Selection criteria: Clearly distinguish between YJV32 (steel-wire armored, offering tensile strength) and YJV22 (steel-tape armored, offering crush resistance only). Specify YJV32 only for applications involving long-distance vertical installation, steep slopes, areas prone to ground subsidence, or river crossings; use YJV22 for standard horizontal direct-burial installations to optimize project costs.
- Compliance with bending radius requirements: Strictly adhere to minimum bending radius specifications during conduit threading, routing around bends, and lifting operations. Excessive bending can deform the steel-wire armor structure, leading to wire displacement and internal insulation damage (such as hidden cracks caused by compression).
- Restrictions on single-core installation: Strictly prohibit the installation of three single-core YJV32 cables within a single enclosed steel conduit for long-distance runs; this prevents issues such as circulating current losses, abnormal cable overheating, and accelerated corrosion of the armor.
- Tension Control for Vertical Installation: During installation in extra-long vertical shafts, specialized cable fixing clamps must be installed at specific intervals to distribute tensile stress caused by the cable's own weight, thereby preventing armor layer slippage and conductor stretching or deformation resulting from excessive tension concentration.
- Direct Burial Installation Specifications: When directly burying YJV32 cables, a bedding layer of fine sand must be laid beneath and above the cable, and warning bricks or warning tape must be placed over it; direct contact between the outer sheath and sharp gravel or debris must be avoided to prevent sheath puncture or damage.
- Armor Layer Grounding Specifications: During cable termination, the steel wire armor layer must be reliably grounded at both ends; specialized armored cable connectors should be used to ensure a continuous grounding path and prevent the accumulation of induced voltage on the armor layer.
- Storage Management Regulations: Finished cable reels must be stored in a dry, well-ventilated warehouse; prolonged exposure to rain and direct sunlight outdoors must be avoided to delay sheath aging and extend shelf life.
- Voltage Application Limits: This product is a low-voltage cable rated at 0.6/1 kV; it must not be used in medium- or high-voltage transmission lines to avoid the risk of insulation breakdown due to overvoltage.
If your project requires a quote, technical specifications, tensile strength data, confirmation of customized construction, or professional consultation on cable selection and installation for YJV32 cables, please submit your request via the inquiry form on our website. Be sure to specify the core configuration, conductor cross-sectional area, total order quantity, cable type (e.g., flame-retardant, fire-resistant, or LSZH), and the destination country. Our professional cable engineering team will provide a tailored technical solution and a highly competitive quote within 24 working hours. We warmly welcome the opportunity to establish long-term strategic partnerships with electrical contractors, renewable energy system integrators, electrical distributors, and architectural design institutes worldwide.
