0.6/1kV Non-Armoured Fire-Suppression Trunk Cable for Indoor Cable Tray, Conduit

ZR-YJV is a flame-retardant, rigid power cable widely used in fixed installations for low-voltage power transmission and distribution systems (AC 0.6/1kV).

• ZR: Abbreviation for "Flame Retardant."

  By industry convention, ZR defaults to the Class C flame retardancy rating (ZC) under the GB/T 19666 standard; this means the cable has passed the single-cable vertical burning test, is capable of limiting flame propagation along the cable's length, and self-extinguishes after the external ignition source is removed. For stricter fire safety requirements, specifications can be upgraded to ZA-YJV (Class A) or ZB-YJV (Class B).

• YJ: XLPE (Cross-linked Polyethylene) insulation;

  its cross-linked molecular structure imparts excellent heat resistance, insulation stability, and resistance to water-tree aging.

• V: PVC outer sheath;

  utilizes a modified flame-retardant formulation, offering good resistance to atmospheric aging, corrosion from weak acids and alkalis, and surface mechanical abrasion.

Unlike standard non-flame-retardant YJV cables, ZR-YJV cables incorporate flame-retardant additives into both their insulation and sheath materials. This effectively inhibits flame propagation along cable bundles, thereby meeting mandatory fire safety regulations for wiring in public buildings and industrial fire-rated zones. Compared to PVC-insulated ZC-VV cables, the XLPE (cross-linked polyethylene) insulation supports a continuous operating temperature of 90°C, offering higher current-carrying capacity, superior overload tolerance, and a longer service life.

This cable series is available in configurations ranging from single-core to five-core, with conductor cross-sections spanning 1.5 mm² to 630 mm². As a cost-effective, mainstream flame-retardant feeder cable, it is widely used for fixed installations in indoor cable trays or conduits and has earned broad recognition among electric power design institutes, fire safety regulators, real estate developers, and electrical subcontractors.

• ZA-YJV (Class A, Highest Grade):

  Passes the most rigorous bunched-cable combustion test; suitable for super-high-rise buildings, core circuits in underground utility tunnels, hazardous chemical zones, and critical hub facilities.

• ZB-YJV (Class B):

  Offers medium-to-high flame-retardant performance; suitable for high-rise commercial buildings, main lines in underground parking garages, and auxiliary power circuits for subways.

• ZR-YJV = ZC-YJV (Class C, Standard Grade):

  Standard flame-retardant type; passes the single-cable vertical combustion test; offers the best cost-performance ratio; suitable for most residential, commercial, and general industrial/civil projects.

• ZR:

  Class C flame retardancy (default); complies with the GB/T 18380 single-cable vertical combustion test standard; inhibits vertical flame propagation.

• YJ:

  XLPE (Cross-linked Polyethylene) insulation; features 90°C long-term heat resistance, low dielectric loss, and resistance to aging and water-treeing.

• V:

  Flame-retardant modified PVC outer sheath; features resistance to weathering and mild chemical corrosion.

• 0.6/1kV:

  Rated insulation voltage U₀/U = 0.6/1kV; compatible with standard three-phase four-wire or five-wire low-voltage distribution networks.

• GB/T 12706.1-2020: Power cables with extruded insulation for rated voltages of 0.6/1 kV
• IEC 60502-1: International standard for low-voltage XLPE-insulated power cables
• GB/T 19666-2019: General rules for flame-retardant and fire-resistant cables
• IEC 60332-1: Test on vertical flame propagation for a single cable
• IEC 60228: Specification for Class 2 compacted stranded copper conductors

• Conductor DC resistance test, 3.5 kV/5 min power-frequency withstand voltage test, insulation resistance test, vertical flame-retardant combustion test, and thermal aging test

• ISO 9001 Quality Management System certification, CCC mandatory product certification, CE marking, third-party full-item type test reports, and raw material incoming inspection documentation; fully meets all requirements for international tenders, fire safety inspections, and project completion acceptance.

• Class 2 Compacted Stranded High-Purity Electrolytic Copper Conductor

  Precision compacting and stranding processes enhance conductor roundness and density, reducing DC resistance and temperature rise during long-term full-load operation. The copper conductor exhibits minimal creep under terminal crimping pressure, ensuring stable contact resistance for over 30 years and eliminating the terminal overheating risks common with aluminum conductors; the smooth surface ensures reliable crimping compatibility with standard cable lugs and termination accessories.

• Flame-Retardant Modified XLPE (Cross-linked Polyethylene) Insulation Layer

  An extrusion process creates an XLPE insulation layer of uniform thickness, with in-line eccentricity monitoring during production. Its 3D cross-linked molecular structure enables a long-term rated operating temperature of 90°C; it offers superior thermal stability compared to PVC insulation and effectively resists degradation caused by water treeing and electrical treeing in humid, enclosed conduit environments. Formulated with flame-retardant additives, the material does not sustain combustion when exposed to open flames and possesses self-extinguishing properties, meeting Class C flame-retardancy requirements.

• Non-hygroscopic PP (Polypropylene) Filler + Binding Tape (Multi-core models only)

  Fills the voids between insulated cores to maintain the cable's overall round profile; cushions against compression and friction between cores during pulling and installation, preventing scratches on the insulation surface; blocks moisture ingress and stabilizes the cable's roundness, ensuring smooth passage through conduits with multiple bends.

• Flame-Retardant Modified PVC Outer Sheath

  The outer sheath utilizes a specialized flame-retardant PVC formulation, imparting overall flame-retardant properties to the cable while providing resistance to UV aging, dust, weak acid/alkali corrosion, and mechanical abrasion during installation. Its balanced hardness ensures both structural flexibility and effective surface protection, making it suitable for long-term fixed installation in indoor cable trays, enclosed cable trenches, and conduits.

• Rated Voltage Class

  U₀/U: 0.6/1kV (AC 50Hz); Maximum system operating voltage (Um): 1.2kV; Designed for general low-voltage three-phase power distribution

• Conductor Configuration Options

  Number of cores: 1, 2, 3, 4, or 5 cores

  Nominal cross-sectional area range: 1.5mm², 2.5mm², 4mm², 6mm², 10mm², 16mm², 25mm², 35mm², 50mm², 70mm², 95mm², 120mm², 150mm², 185mm², 240mm², 300mm², 400mm², 500mm², 630mm²

  Conductor standard: IEC 60228 Class 2 rigid compacted stranded copper conductor

• Thermal Performance Specifications

  Maximum long-term continuous operating temperature of conductor: 90°C

  Maximum short-circuit withstand temperature of conductor (duration ≤ 5 seconds): 250°C

  Minimum ambient temperature for installation: 0°C; preheating is required for installation below 0°C to prevent sheath embrittlement and cracking

  Design service life under standard installation and normal operating conditions: ≥ 30 years

  Flame retardancy: Complies with GB/T 18380 single-cable vertical burning test requirements; self-extinguishes within the specified time after the ignition source is removed

• Mandatory installation bending radius requirements (critical control point for on-site installation; D = cable outer diameter)

  Minimum bending radius for single-core ZR-YJV: ≥ 20 × cable outer diameter

  Minimum bending radius for multi-core ZR-YJV: ≥ 15 × cable outer diameter

• Structural characteristics note:

  ZR-YJV is an unarmored cable without steel tape mechanical protection; direct burial is strictly prohibited in scenarios subject to soil pressure, impact, or rodent damage risks; please select the armored ZR-YJV22 cable for direct burial applications.

The continuous current-carrying capacity is 15%–25% higher than that of ZC-VV PVC-insulated cables of the same cross-section, offering superior overload capability. Its flame-retardant performance meets standard fire safety acceptance requirements for buildings, making it suitable for densely bundled installation in cable trays and for routing across fire compartments.

• Inherently Class C flame-retardant; complies with mandatory fire safety acceptance standards.

  The insulation and sheath layers utilize an integrated flame-retardant formulation and have passed the single-cable vertical burning test. In the event of a fire, the cable inhibits longitudinal flame propagation along the line, preventing the fire from spreading rapidly through cable trays and electrical shafts, thereby simplifying the fire safety approval process for building electrical designs.

• XLPE high-temperature insulation properties enable higher current-carrying capacity and superior overload resilience.

  Compared to PVC-insulated ZC-VV cables (which have a long-term operating temperature of 70°C), XLPE cables support a long-term operating temperature of 90°C, resulting in significantly higher current-carrying capacity. This not only provides an ample safety margin for handling peak load fluctuations but also eliminates the risk of thermal aging associated with prolonged full-load operation on main feeder lines, making them ideal for high-power main power distribution circuits.

• Excellent aging resistance and moisture protection make them suitable for diverse indoor installation environments.

  XLPE material effectively resists "water treeing" degradation—a common issue in damp basements, conduits, and enclosed vertical shafts—ensuring minimal insulation performance decay over time. This results in a reduced risk of leakage and short circuits during long-term operation, thereby lowering the frequency of troubleshooting and repairs.

• A comprehensive, standardized specification system accelerates design work and the technical clarification process during tendering.

  This series offers a complete range of conductor cross-sections and core configurations, backed by verified current-carrying capacity data, standardized bending radius parameters, and compatible terminal accessories; it is widely recognized by design institutes and fire safety regulatory bodies. Engineers avoid the need for repetitive scheme validation, which shortens the cycles for drawing reviews and tender preparation while minimizing the risk of specification selection errors.

• Flexible flame-retardant rating upgrades enable tiered fire protection system matching.

  Products can be upgraded to ZB-YJV or ZA-YJV specifications to meet the requirements of high-standard fire safety projects; designers can select the appropriate flame-retardant grade based on the building's fire safety rating, establishing a tiered fire protection layout for the entire electrical system that complies with national design codes.

• Strikes a balance between high-performance flame retardancy and cost, effectively controlling initial project investment.

  The ZR (ZC) grade is the most widely used mainstream flame-retardant specification; with a lower unit price than the ZB/ZA series, it is suitable for large-scale application in residential and general commercial projects, helping procurement teams secure a favorable total material budget during the bidding phase.

• High installation adaptability; reduces on-site wiring time

  The cable features moderate flexibility, making it easy to pull through conduits with multiple bends and facilitating stripping and terminal crimping. Installation efficiency surpasses that of rigid, large-cross-section PVC cables, helping to shorten electrical installation schedules and control subcontractors' overall labor costs.

• Low long-term failure rate; reduces total maintenance and replacement costs

  Stable insulation performance minimizes circuit failures caused by aging or overheating. With a 30-year service life requiring no frequent excavation, retrofitting, or rewiring, the cable offers superior lifecycle economic benefits compared to low-cost, non-flame-retardant YJV cables.

• Mass production of mainstream models; avoids customization surcharges and delivery uncertainty

  Common cross-section specifications of ZR-YJV cables are continuously mass-produced, ensuring stable unit prices and reliable delivery schedules, while effectively mitigating risks associated with market price fluctuations for raw materials such as copper and plastics.

• Compatible with standard low-voltage electrical accessories, simplifying decentralized procurement management.

  Compatible with standard cable glands, crimp terminals, junction boxes, and cable tray accessories—eliminating the need for custom-made parts—and streamlining tasks for project procurement departments, such as BOM (Bill of Materials) compilation, incoming quality inspection, and on-site warehouse inventory management.

• Vertical routing of main incoming lines and floor distribution box connections within electrical shafts in residential buildings; indoor wiring for residential grid upgrades
• Main trunk lines in cable trays, wiring across fire compartments, and main cabinet incoming lines in distribution rooms for shopping malls, office buildings, and large commercial complexes
• Indoor cable trenches, workshop power distribution trunk lines, and fixed power supply wiring for production equipment in light industry, machinery manufacturing, and industrial parks
• Auxiliary power distribution wiring for data centers, logistics warehouses, and parking facilities (meeting basic fire safety design requirements)
• Power infrastructure for public facilities, as well as the installation of fixed indoor power distribution trunk lines in schools, hospitals, and stadiums
• Output lines from PV combiner boxes, internal distribution branch circuits in energy storage cabinets, and indoor flame-retardant wiring for distributed new energy systems

Project Requirements: Install flame-retardant cables—comprising vertical shaft main lines and floor-level branch lines—for 22 high-rise residential buildings (using bundled cable tray installation); ensure compliance with fire safety acceptance standards and power utility inspections; and manage the total material procurement budget.

Solution Implemented: Bulk procurement of ZR-YJV flame-retardant cables (specifications including 3×185+1×95 mm² and 5×70 mm²), totaling 61.7 kilometers in length.

Project Outcomes: The cables met Class C flame-retardancy standards and successfully passed fire safety filing and final completion inspections. The design utilized XLPE (cross-linked polyethylene) insulation for high current-carrying capacity, providing ample load headroom for future increases in residential electricity demand. No insulation degradation or overheating failures occurred within five years of operation. The general contractor designated the ZR-YJV model as the standard flame-retardant cable for subsequent phases of the complex's development.

Project Requirements: Replace aging standard cables across eight production workshops; install trunk cables via wall-mounted cable trays; accommodate environments with dust and slight humidity; ensure basic flame-retardant capabilities to meet factory safety audit standards and minimize downtime losses caused by circuit failures.

Solution Implemented: Utilized various specifications of ZR-YJV (flame-retardant, cross-linked polyethylene insulated power cables)—including 3-core, 4-core, and 5-core types—with a total supply length of 38.9 kilometers.

Project Outcomes: The flame-retardant design complied with workshop fire safety regulations; the system operated reliably, with no short-circuit or overheating incidents over four years of continuous production; annual electrical maintenance costs were significantly reduced, and the system consistently passed corporate safety inspections.

Project Requirements: Scope included cabling for indoor public areas, equipment rooms, and underground power distribution backbones; compliance with mandatory fire-retardant design standards for public buildings was required; installation involved centralized, bundled routing via large-scale cable trays; and the project was subject to rigorous fire safety inspection and acceptance standards.

Solution Implemented: ZR-YJV series single-core and multi-core fire-retardant cables were used throughout, with a total supply length of 45.3 kilometers; for critical fire-safety zones, the specification was upgraded to ZB-YJV cables in accordance with design requirements.

Project Outcome: The ZR-YJV backbone cabling configuration aligned perfectly with the tiered fire-safety design, enabling the project to pass fire safety and final completion inspections on the first attempt; the standardized installation layout facilitated future facility operations, maintenance, and circuit servicing, establishing this cable model as the preferred fire-retardant product for subsequent municipal public building tenders.

• Comprehensive Verification of Electrical and Environmental Parameters Prior to Final Selection

  Before selecting ZR-YJV cables, it is essential to perform ampacity calculations, verify voltage drop, analyze the number of cables bundled in trays, and confirm the building's fire rating. Our technical team can provide comparative reports on specifications for ZR-YJV, ZB-YJV, and ZC-VV cables to help you mitigate risks associated with insufficient ampacity and avoid inappropriate selection grades or unreasonable costs.

• Strict Adherence to Standardized Procedures for Terminal Stripping and Crimping

  When stripping insulation or sheathing, strictly avoid damaging the copper conductor; before crimping cable lugs, carefully align and compact loose strands to prevent heat generation at the contact point caused by loose individual wires; strictly prohibit clamping bare strands directly with screws without using terminals to ensure long-term electrical connection reliability.

• Strict Control of Minimum Bending Radius During Installation

  Prescribed bending radius limits must be observed throughout the installation process; sharp bends can compress and damage the internal insulation, creating potential points for accelerated aging; install chamfered protective sleeves at conduit entry and exit points to prevent scratching the outer sheath during cable pulling.

• Installation Environment and Application Limitations

  The ZR-YJV unarmored cable cannot withstand underground soil pressure, mechanical impact, or rodent damage; for direct-burial applications, the ZR-YJV22 steel-tape armored cable must be used. This cable is unsuitable for environments involving prolonged proximity to high-temperature pipelines (in such cases, specialized high-temperature cables or armored models should be selected).

• Ambient Temperature Requirements for Installation

  The ambient temperature during installation must not be lower than 0°C; if installation takes place in temperatures below freezing, pre-heating is required to prevent the outer sheath from becoming brittle and cracking during bending operations.

• Standardized Storage and Transport Management for Cable Drums

  Cable drums should be stored on a flat, solid surface within a dry, well-ventilated warehouse; prolonged exposure to direct sunlight or rain outdoors must be avoided to prevent accelerated aging of the flame-retardant sheath. During loading, unloading, and transport, precautions must be taken to prevent severe impact, crushing, or tipping of the drums, thereby avoiding defects such as sheath cracking, internal conductor displacement, or damage to the insulation layer.

• Comprehensive, customized certification documentation tailored to tender requirements for the ZR-YJV flame-retardant cable series

  All products are manufactured in strict accordance with GB/T 12706, GB/T 19666, and relevant IEC international standards. We provide—free of charge—a complete package of factory qualification documents, full type-test reports, flame-retardancy test records, third-party inspection certificates, and editable technical parameter sheets specifically designed for tenders. This ensures full compliance with global engineering tender requirements regarding document review, bid submission, fire safety inspections, and final project acceptance.

• Rigorous raw material selection and targeted, end-to-end quality control for flame-retardant XLPE cables

  We utilize premium flame-retardant XLPE insulation compounds, flame-retardant PVC sheathing materials, and high-purity copper rods specifically designed for power cables. Key production stages—such as conductor stranding, insulation extrusion, cabling, and sheathing extrusion—are equipped with real-time, online monitoring systems for outer diameter and concentricity. These systems ensure stable conductor resistance, uniform insulation thickness, and consistent flame-retardant performance across production batches, thereby minimizing the risk of rejection during incoming inspections for large-scale tender orders.

• Flexible, personalized customization tailored to specific project requirements

  We offer options such as selectable flame-retardant grades (ZA/ZB/ZC), fixed-length cutting, custom core color configurations, and packaging on wooden reels or export-grade steel drums. We also provide customized bulk supply solutions based on client drawings and specific engineering requirements, covering the full range of ZR-YJV core counts and cross-sectional sizes; armored ZR-YJV22 products are also available for direct-burial applications.

• Factory-direct sales model with stable pricing and flexible order minimums

  As the manufacturer, we eliminate intermediary markups; we support small-batch sample orders for pre-bid qualification testing and prioritize production scheduling for bulk orders. We maintain ready stock of mainstream ZR-YJV cable specifications to ensure rapid delivery, meeting the tight construction schedules of commercial and industrial projects.

• Comprehensive Technical Support for Low-Voltage Electrical Engineering

  Our expert cable design engineers provide services including ampacity calculations, total cost of ownership (TCO) analysis for ZR-YJV and ZC-VV cables, optimization consulting for bundled cable tray layouts, remote and on-site installation guidance, and standardized post-sales quality tracking. Backed by formal, long-term product warranties, these services eliminate technical and quality-related concerns for procurement and engineering teams after orders are placed.

• Extensive Experience in Exporting for Overseas Industrial and Commercial Power Distribution Projects

  We possess mature export packaging solutions, comprehensive customs documentation support, and efficient global logistics channels. We have a proven track record of reliable supply for electrical projects—ranging from real estate development and factory upgrades to commercial complex construction and public infrastructure—across Southeast Asia, Central Asia, Africa, the Middle East, and Latin America. Furthermore, we are well-versed in the specific regulatory requirements for product certification, fire safety inspections, and compliance filings regarding ZR-YJV flame-retardant cables in various overseas markets.

FAQs

• Q1: What is the fundamental difference between ZR-YJV and ZC-YJV?
  A1: "ZR" is a general abbreviation for flame-retardant cables; in industry practice, "ZR" is typically synonymous with Class C flame retardancy (i.e., ZC-YJV). Strictly speaking, under the GB/T 19666 standard, "ZC" is the formal designation for Class C flame-retardant cables that pass the single vertical burning test, whereas "ZR" is a common colloquial term; "ZA," "ZB," and "ZC" are the standardized grade designations used in formal tender documents. In practical engineering applications, however, the two share identical core electrical structures, XLPE (cross-linked polyethylene) insulation properties, and application scenarios.
• Q2: Can ZR-YJV cables be laid directly underground without protective conduit?
  A2: No. ZR-YJV is an unarmored cable lacking mechanical protection layers such as steel tape; if buried directly, it is highly susceptible to damage from soil pressure, puncture by stones, or rodent gnawing. For underground installation, a flame-retardant cable model with steel tape armor—specifically ZR-YJV22—should be used.
• Q3: What is the difference between ZR-YJV and standard non-flame-retardant YJV?
  A3: Standard YJV cables lack flame-retardant additives in their insulation and sheath layers, meaning they will continue to burn and allow the fire to spread if ignited. In contrast, ZR-YJV cables utilize flame-retardant modified materials; they are self-extinguishing once the ignition source is removed and inhibit the spread of flames, thereby complying with mandatory building fire safety design standards. Both types feature 90°C cross-linked polyethylene (XLPE) insulation and offer identical electrical current-carrying capacity.
• Q4: What certification documents can you provide for ZR-YJV cables to meet international tender requirements?
  A4: We can provide manufacturing qualification certificates, ISO9001 certification, CCC certification, CE certification, comprehensive type test reports (covering flame retardancy, conductor resistance, withstand voltage tests, etc.), raw material incoming inspection records, third-party authoritative test certificates, and customized ZR-YJV technical data sheets for tenders.
• Q5: What is the standard production lead time for bulk orders of ZR-YJV cables?
  A5: Standard-specification products (non-customized, in-stock items) can be shipped within 3–7 working days; orders involving customized flame-retardant ratings, specific cut lengths, or special packaging requirements have a production lead time of 10–20 working days. For EPC projects with tight schedules, priority production can be arranged upon negotiation to ensure the construction timeline is met.
• Q6: Why is it necessary to calculate current-carrying capacity derating when ZR-YJV cables are laid in bundles within cable trays?
  A6: Densely arranged cables result in poor heat dissipation, causing internal temperature rises to exceed design limits and accelerating the aging of the insulation layer. To prevent safety hazards caused by overload and overheating during long-term operation, professional derating calculations must be performed based on the number of cables, cable tray ventilation conditions, and ambient temperature.