0.6/1kV WDZ-YJY23 Steel Tape Armored LSZH Flame Retardant Power Cable for Direct Burial, Tunnel & Underground Infrastructure Wiring

• WDZ:

  Features low-smoke, zero-halogen, and flame-retardant properties; flame-retardant grades (WDZA/WDZB/WDZC) can be customized as required.

• YJ:

  Utilizes cross-linked polyethylene (XLPE) as the primary insulation layer.

• Y:

  Employs low-smoke, zero-halogen polyolefin material for the inner bedding layer.

• 23:

  Features double-layer galvanized steel tape armor and a low-smoke, zero-halogen (LSZH) outer sheath, specifically designed for mechanical protection in harsh underground environments.

• Rated Voltage:

  0.6/1kV (low voltage), suitable for building and municipal power distribution systems.

The WDZ-YJY23 0.6/1kV is a heavy-duty, flame-retardant, armored power cable designed for fixed power transmission and distribution lines that require both fire safety and external mechanical protection. Unlike unarmored WDZ-YJY cables—which are vulnerable to crushing, excavation damage, and rodent gnawing when buried—this model incorporates double-layer steel tape armor to effectively withstand external physical impacts, soil pressure, and accidental damage during construction. At the same time, it retains its low-smoke, zero-halogen, and flame-retardant properties, meeting stringent fire safety regulations for enclosed spaces and densely populated public areas.

Under fire conditions, the WDZ-YJY23 cable produces only a small amount of light smoke and releases no corrosive halogen-based acidic gases; this ensures clear visibility along evacuation routes while effectively inhibiting flame propagation along the cable line. These cables are widely used in projects undertaken by electric power design institutes, municipal general contractors, underground engineering firms, new energy developers, and electrical wholesalers, and are suitable for various installation scenarios, including direct burial, cable trenches, utility tunnels, standard tunnels, and semi-exposed settings. The product complies with mandatory national inspection standards and third-party comprehensive testing requirements, and a full suite of technical documentation is available to support bidding, project filing, fire safety acceptance, and final project acceptance.

We offer services tailored to overseas project tender requirements, including flame-retardant grade adjustments (Class A/B/C), custom cross-sections, special-length cutting, and assistance with international certification applications.

• Oxygen-Free Copper Conductor

  Utilizes Class 1 solid copper conductors or Class 2 compacted stranded conductors made of high-purity annealed copper. These conductors feature low DC resistance, stable long-term conductivity, oxidation resistance, and low line loss, making them suitable for medium-to-long-distance backbone power transmission. Available cross-sections range from 1.5 mm² to 630 mm², meeting diverse load design requirements.

• XLPE Insulation Layer

  Features extruded cross-linked polyethylene (XLPE) insulation, with real-time monitoring of eccentricity and thickness during production. It offers excellent thermal aging resistance, high dielectric strength, and resistance to partial discharge and ozone erosion, ensuring stable insulation performance under conditions of fluctuating temperatures and decades of continuous full-load operation.

• Halogen-free Filler and Binding Tape

  Eco-friendly, halogen-free filler material fills the interstices between insulated cores to create a circular cable profile; this enhances crush resistance and prevents core twisting or displacement during bending or pulling operations. An overall binding tape serves to minimize friction between internal cores and stabilize the internal structure.

• Low-Smoke Zero-Halogen (LSZH) Inner Bedding

  An extruded LSZH polyolefin inner sheath acts as a buffer layer between the cores and the steel tape armor. This prevents the sharp edges of the armor from abrading the insulated cores during bending or under pressure, while also enhancing the structural integrity and moisture resistance of the cable.

• Double-Layer Galvanized Steel Tape Armor

  A double-layer, helically wrapped galvanized steel tape structure provides robust protection against soil pressure, excavation impacts, rodent damage, and punctures by sharp objects. This design enables direct-burial installation without the need for additional protective conduit, thereby significantly simplifying the direct-burial installation process.

• LSZH (Low-Smoke Zero-Halogen) Outer Sheath

  Features a flame-retardant, low-smoke zero-halogen polyolefin outer sheath offering excellent resistance to soil acidity/alkalinity and groundwater moisture, as well as superior weather and UV resistance (suitable for sections exposed to the open air). It emits no toxic halogen gases and produces low smoke density during combustion, meeting fire safety and environmental protection standards.

Includes factory inspection reports, raw material certificates of conformity, flame-retardant performance test reports, smoke density and halogen content test reports, and product certificates of conformity. Applications can be made for CCC mandatory certification, CE certification, and other third-party test certificates to meet requirements for domestic government project qualification reviews, overseas bidding, and customs clearance.

1. Advantage 1: Dual Protection via Mechanical Armoring and LSZH (Low-Smoke Zero-Halogen) Fire Safety

   Compared to unarmored WDZ-YJY cables, this cable features an integrated double-steel-tape armor structure that effectively mitigates the risk of hidden damage caused by soil pressure, accidental excavation, or rodent gnawing. It supports direct-burial installation, eliminating the need for additional conduit costs. Furthermore, its low-smoke, zero-halogen, and flame-retardant properties comply with mandatory fire safety codes for public buildings, offering a single-cable solution that combines robust mechanical protection with fire safety performance.

2. Advantage 2: Lower Total Cost for Underground Installation Projects

   Using WDZ-YJY23 cables for underground installations eliminates expenses associated with rigid protective conduits, trench excavation, and piping accessories. Although the unit price of the cable is slightly higher than that of non-armored models, it significantly reduces the total material and labor costs for underground installation and shortens the construction timeline, thereby lowering the overall investment required for large-scale municipal renovation projects.

3. Advantage 3: Superior Underground Corrosion Resistance and Exceptional Service Life

   Featuring a dual-layer Low-Smoke Zero-Halogen (LSZH) sheath structure, the cable effectively withstands soil acidity and alkalinity, groundwater infiltration, and microbial or fungal attack in challenging underground environments—such as damp, low-lying, or riverside areas. Engineered for long-term direct burial, it offers a reliable service life exceeding 25 years, thereby reducing the frequency of inspection, replacement, and maintenance required by project owners and property management teams.

4. Advantage 4: Operational Stability During Fire Emergencies

   In the event of a fire, the cable effectively inhibits flame propagation along the line, ensuring a continuous power supply to critical circuits such as emergency lighting, fire alarm systems, fire pumps, and smoke exhaust fans. In contrast, traditional PVC-armored YJV23 cables release large amounts of toxic smoke and corrosive halogen gases when burning; these emissions not only hinder evacuation and cause secondary corrosion damage to equipment but also fail to meet the fire safety design standards required for public buildings.

5. Advantage 5: Fully Compliant with Municipal Tender and Project Acceptance Requirements

   WDZ-YJY23 is a specified model in electrical design standards for underground municipal infrastructure, rail transit, and major public construction projects. Comprehensive certification documentation can be organized and customized to meet requirements for bidding, project filing, and fire safety acceptance, thereby mitigating risks associated with non-compliant specifications during the tender and project closeout phases.

1. Municipal Road Renovation and Underground Direct-Burial Projects

   Buried power trunk lines for road widening projects; grid upgrades for residential communities; main power supply cables for underground parking garages; and buried power lines for municipal drainage systems and pumping stations (suitable for direct-burial installation in backfill soil, requiring resistance to crushing and mechanical damage).

2. Urban Utility Tunnel and Underground Pipeline Tunnel Projects

   Covers primary power distribution circuits within urban underground utility tunnels, long-distance cable trench installations, and interconnecting cables between basement areas; product designs meet requirements for low-smoke, eco-friendly performance and mechanical protection in enclosed spaces.

3. Rail Transit, Highway Tunnel, and Underground Passageway Projects

   Encompasses auxiliary power distribution circuits for metro stations, dedicated power supply circuits for tunnel ventilation, lighting, and monitoring systems, as well as main power lines for underground pedestrian walkways; features low-smoke, zero-halogen (LSZH) properties and complies with stringent fire safety and evacuation design standards for enclosed underground transportation spaces.

4. Basements and Underground Auxiliary Systems for Large-Scale Public Buildings

   Suitable for high-occupancy public venues subject to strict fire safety regulations—such as hospital basement power distribution mains, airport terminal underground auxiliary cabling, underground power circuits for stadiums and exhibition centers, and dedicated fire-safety circuits in shopping mall basements.

5. Ground-Mounted New Energy Power Plants and Industrial Park Underground Cabling

   Suitable for underground array combiner cables in ground-mounted PV plants, long-distance collector mains in wind farms, and underground power distribution circuits in industrial complexes; designed to withstand complex outdoor terrain, direct-burial installation (backfilling), and mildly corrosive industrial soil environments.

1. Case Study 1: Urban Utility Tunnel Phase III Project – Direct-Buried Main Power Line

   A municipal general contractor selected a large volume of 0.6/1kV WDZ-YJY23 4*185mm² cables as the main power supply lines for an urban underground utility tunnel expansion project. The original plan—utilizing unarmored WDZ-YJY cables installed within protective conduits—resulted in an excessively high total material budget. Following a comparative analysis of electrical schemes and load verification, the client switched to a direct-burial installation method using WDZ-YJY23 cables, thereby reducing the combined cost of materials and labor by 27%. Our team provided comprehensive testing documentation for government tender review, coordinated phased deliveries to align with the civil construction schedule, and offered professional technical guidance on cable pulling, bending radius control, and termination procedures. Upon completion, the project successfully passed dual inspections by municipal and fire safety authorities.

2. Case Study 2: Power System Retrofit for a Tertiary Hospital Basement

   A tertiary hospital initiated an upgrade project for its basement power supply system, requiring main power distribution cables that were both resistant to external mechanical damage and compliant with public safety standards regarding low-smoke, zero-halogen, and flame-retardant properties. The design institute formally specified the WDZ-YJY23 cable model. We arranged for sample production and third-party performance testing, compiled comprehensive certification documentation for filing and review by health authorities, optimized the bill of materials to minimize inventory waste, and scheduled off-peak deliveries to comply with hospital traffic restrictions. After 18 months of stable operation, periodic thermal imaging inspections showed no overheating at connection points, and insulation performance remained normal.

3. Case Study 3: Collection Line Project for a Large-Scale Ground-Mounted PV Power Plant

   A renewable energy procurement company purchased a large volume of multi-core WDZ-YJY23 cables for the underground collection lines of a large-scale ground-mounted photovoltaic power plant. Spanning vast agricultural areas, the project required cables with sufficient compressive strength to withstand backfilling operations, while also meeting standards for outdoor weather resistance and fire safety. The use of an armored cable design eliminated the need for protective conduits, thereby significantly shortening the on-site construction period and reducing the total project investment. We provided customized cable reel labeling to facilitate on-site inventory management, utilized wooden reels suitable for maritime export, implemented rigorous and consistent quality spot-checks across the entire order, and signed a long-term framework supply agreement for future expansion projects.

1. Regulations for Low-Temperature Installation

   Cable pulling and laying operations are strictly prohibited when the ambient temperature is below 0°C. If winter construction is unavoidable, gradual preheating measures must be implemented to prevent the outer sheath from cracking due to forced bending or stretching.

2. Strict Standards for Bending Radius Control

   During operations such as conduit pulling, navigating turns in trenches, vertical shaft installations, and cable tray routing, the cable bending radius must not fall below the specified minimum. Excessive bending can compress internal insulated cores and deform the steel-tape armor structure, creating long-term risks of insulation breakdown and water ingress.

3. Standardized Specifications for Terminal Connections

   Cable terminal crimping must utilize compatible copper lugs, and all connection points must undergo reliable insulation wrapping and sealing. Inadequate crimping can lead to localized overheating during prolonged operation under load, thereby accelerating insulation aging and potentially causing circuit failures.

4. Requirements for Direct-Burial Installation

   When employing the direct-burial method, a bedding layer of fine sand must be laid above and below the cable, and warning bricks must be installed along the cable route in accordance with electrical specifications. Additionally, safe clearance distances from water supply, gas, and telecommunications pipelines must be maintained to prevent damage from future external excavation work.

5. Sealing and Protection Requirements for Humid Environments

   When installing cables in damp cable manholes, enclosed underground utility tunnels, or underground trenches, compatible waterproof cable glands and sealing accessories must be installed at cable entry and exit points. This serves to block groundwater from seeping into the conductor cores and prevents the degradation of insulation performance caused by long-term moisture exposure.

6. Installation Requirements for Cable Trays

   When WDZ-YJY23 cables are installed in the same cable tray compartment alongside non-flame-retardant (standard) cables, a partition barrier must be installed in accordance with electrical design specifications to inhibit the spread of flames in the event of a fire.

7. Warehouse and On-Site Storage Guidelines

   Finished cable reels should be stored in a dry, well-ventilated indoor warehouse to avoid prolonged exposure to sunlight and rain, thereby delaying sheath aging and embrittlement. When stacking, reels must be kept horizontal and stable to prevent deformation of the armor layer caused by vertical compression.

1. Fully Customizable Specifications to Precisely Match Design Drawings

   We manufacture a comprehensive range of WDZ-YJY23 0.6/1kV cables covering various cross-sectional areas and core configurations. We offer services such as cut-to-length processing based on construction drawings, custom sheath colors, reel-side labeling, and personalized export packaging solutions. Should designers adjust direct-burial installation plans, our technical team provides free support for cable model substitution verification and ampacity calculations.

2. Strict Quality Control Across Raw Materials and Production Batches

   We utilize only certified high-purity copper rods, qualified XLPE insulation materials, verified LSZH sheath materials, and galvanized steel tape. Every production batch undergoes DC resistance testing, insulation resistance checks, and spot inspections for flame retardancy and smoke emission performance prior to shipment, ensuring consistent and uniform product quality for large-scale project orders.

3. One-Stop Documentation Services for Bidding and Acceptance

   We consolidate essential documents—such as factory test reports, raw material certificates, fire performance inspection records, and product conformity certificates—into a unified, comprehensive package. Tailored to specific requirements—including government tenders, project filings, fire safety inspections, and overseas customs clearance—our customized document organization services significantly reduce the time and labor costs procurement teams spend on documentation management and qualification verification.

4. Flexible Order Volumes and Global Logistics Solutions

   We accommodate a wide range of order sizes, from small-batch sample trials for preliminary performance verification to medium-batch stock production and large-scale bulk supplies for major infrastructure projects. We offer door-to-door delivery for domestic projects; for overseas orders, we provide sea-worthy wooden reel packaging, container loading arrangements, and coordination of complete export customs documentation.

5. Professional After-Sales Electrical Technical Support

   Our team of senior electrical engineers provides complimentary technical services, including ampacity verification, cable selection optimization, consultation on direct-burial installation plans, preparation of bills of quantities (BOQ), and technical liaison with design institutes. During the construction phase, we offer rapid responses to inquiries regarding on-site routing, joint connections, and troubleshooting, promptly resolving technical issues to ensure the project's overall construction schedule proceeds smoothly.

6. Stable Pricing Strategies for Long-Term Framework Partnerships

   For engineering contractors, electrical distributors, and clients with recurring bulk procurement needs, we have introduced long-term framework agreement pricing, tiered volume discounts, and raw material price-locking solutions. These measures are designed to effectively stabilize project procurement budgets and mitigate risks associated with copper price fluctuations in long-cycle engineering projects.