Medium Voltage Flame Retardant XLPE Steel Tape Armoured Cable For Fire Risk Industrial Park, Municipal Pipe Gallery & Heavy Load Transformer Distribution
Product Summary
Product Details
medium voltage flame retardant cable
,XLPE steel tape armoured cable
,heavy load transformer distribution cable
Product Description
The ZR-YJV22 8.7/15kV flame-retardant cross-linked polyethylene steel tape armored medium-voltage cable strictly adheres to the national standard GB/T 12706.3-2020 "6kV~35kV Medium-Voltage Power Cables". Its flame-retardant performance meets the GB/T 19666 bundled flame-retardant rating specification, fully complies with the international IEC 60502-2 medium-voltage cable standard, and meets EU CE LVD and EMC directives. It also meets the requirements for domestic power bureau registration, fire safety supervision review, and cross-border industrial EPC bidding and customs clearance.
All finished cable reels have passed comprehensive third-party type testing by a nationally authorized high-voltage electrical laboratory, covering specialized medium-voltage flame-retardant tests that cannot be performed on low-voltage cables: bundled vertical flame spread test, long-cycle partial discharge aging test, 76kV power frequency withstand voltage test, 105kV lightning impulse test, high-temperature thermal cycling aging test, static heavy extrusion mechanical test, and long-term wet hot water immersion test.
Each medium-voltage fire protection engineering order comes with a complete set of official documents stamped by the factory, at no additional cost: medium-voltage full-type test report, ZR flame-retardant special performance inspection certificate, batch factory inspection record, T2 oxygen-free copper raw material inspection certificate, CE certificate, independent full-batch traceability file, dedicated medium-voltage cable terminal production, and pipe gallery bundling and grounding construction manual. All materials fully comply with the safety supervision standards of industrial parks, municipal pipe gallery acceptance, chemical plant fire inspection, and overseas medium-voltage engineering bidding review standards.
- ZR: General bundled flame-retardant rating, which can suppress the vertical and horizontal spread of flames when multiple cables are densely laid in enclosed pipe galleries and factory cable trenches.
- YJ: Flame-retardant modified high-purity cross-linked polyethylene (XLPE) insulation, using a thickened insulation formula specially customized for 8.7/15kV medium-voltage electric field balance.
- V: Extruded PVC inner insulating sheath, used to isolate the copper strip metal shielding layer and the steel strip armor layer.
- 22: Double-layer staggered overlapping galvanized steel strip armor + flame-retardant and anti-aging black PVC outer sheath.
- Rated voltage level: U0/U=8.7/15kV, suitable for complete 15kV three-phase medium-voltage distribution networks.
- Conductor configuration: Three-core mainstream configuration, Category 2 compacted T2 oxygen-free copper core, customizable. Cross-sectional area range 16mm²～630mm², fully covering small box-type transformer incoming cables to large industrial central substation main feeders.
High-density circular stranded pure copper core, with DC resistivity strictly controlled below the national standard upper limit. Low resistivity effectively suppresses voltage drop in long-distance underground pipelines of heavy-duty industrial 15kV main lines, ensuring stable continuous current carrying capacity under 24-hour full-load operation of smelting, chemical, and energy storage equipment. High density reduces cable outer diameter, saving construction teams limited internal layout space in pipe corridors. Utilizing 100% new oxygen-free copper raw materials, without any recycled copper, ensuring consistent conductivity across all batches.
The uniformly extruded semiconductor layer is tightly bonded to the copper core surface, eliminating micro-gaps between the conductor and the thickened medium-voltage cross-linked polyethylene insulation layer. This homogenizes the high-intensity internal electric field, fundamentally suppressing the risk of partial discharge breakdown under long-term 15kV high-voltage operation. It is the core safety structure for fire-resistant enclosed pipe corridor installations.
Utilizing a customized thickened insulation layer, matched to the 15kV voltage level, it employs a halogen-containing high-efficiency flame-retardant cross-linked polyethylene composite material, fundamentally different from ordinary non-flame-retardant YJV22 8.7/15kV cables. The long-term allowable continuous operating temperature can reach 90℃; the instantaneous short-circuit heat resistance temperature can reach 250℃ within 5 seconds, capable of withstanding severe overcurrent impacts during medium-voltage power grid short-circuit faults. Under open flame combustion conditions, the material rapidly forms a dense carbonized insulation layer, effectively blocking heat transfer and electric field breakdown, significantly extending the safe response time of the fire-fighting linkage protection system.
The outer semiconductor layer is tightly bonded to the insulation layer, forming a closed electric field buffer structure in conjunction with the fully encapsulated copper tape metal shielding layer. This prevents localized electric field concentration caused by cable bending, extrusion scratches, and long-distance traction friction during pipeline construction.
A wide-overlapping soft copper tape shielding layer completely covers each insulated core wire, effectively conducting induced high-voltage currents and large short-circuit ground fault currents in 15kV industrial power grids, isolating internal high-frequency electromagnetic radiation, and preventing signal distortion and interference. It is laid side-by-side with adjacent DCS monitoring, communication, and fiber optic cables in enclosed conduit corridors. The shielding layer cross-section meets the large short-circuit grounding capacity standards for large 15kV industrial power distribution systems.
An integrated PVC inner sheath wraps the three-core shielding assembly, completely isolating the copper tape shielding layer and the outer steel tape armor layer, preventing groundwater, industrial wastewater, soil salt ions, and weakly acidic chemical residues from corroding the inner metal shielding layer and XLPE insulated core wires.
Two layers of staggered, overlapping galvanized steel tape spiral winding structure provide strong radial compression resistance, resisting abrasion from sharp underground rocks, long-term heavy truck traffic on municipal roads, collisions with construction machinery, and gnawing by underground rodents. Precisely controlled winding gaps prevent the steel strip edges from scratching the PVC lining during long-distance cable traction and multi-angle bending construction in narrow pipe racks.
Utilizing a modified flame-retardant composite outer sheath, it features an anti-aging and ozone-resistant formula, providing additional self-protection against carbonization under open flame conditions. Suitable for direct underground burial, municipal integrated pipe gallery installation, factory underground cable trenches, and semi-outdoor wall pipe installation; exhibits stable corrosion resistance in urban neutral soils and industrial chemical residue soil environments.
- ZA/ZB/ZC-YJV22 8.7/15kV: Three flame retardant grades, matching different fire hazard levels in industrial parks, utility tunnels, and chemical production areas.
- WDZ-YJV22 8.7/15kV: Low-smoke halogen-free flame retardant upgraded product, suitable for 15kV transformers in subway rail transit substations and central hospitals.
- Enhanced Chemical Corrosion Resistant Flame Retardant Sheath: Customized for underground medium-voltage circuits in fine chemical, pharmaceutical, and printing industrial parks.
- Low-Temperature Resistant Flame Retardant Sheath: Suitable for 15kV power grid renovation projects in high-altitude industrial areas and cold regions.
- Rated AC Operating Voltage: 8.7/15kV Three-phase industrial and municipal medium-voltage power distribution systems
- Power Frequency Withstand Voltage Test: 76kV, no breakdown or abnormal discharge for 15 consecutive minutes
- Lightning Impulse Withstand Voltage: 105kV, passed positive and negative polarity impulse test
- Partial Discharge Characteristics: Discharge amplitude less than 10pC at rated operating voltage, stable performance after thousands of hours of continuous cyclic aging test
- Reference Continuous Current Carrying Capacity: 360A for standard direct underground laying; 310A for multi-layer parallel cable trench/pipe gallery bundling laying
- Ultra-low dielectric loss design reduces cable self-heating loss under 24-hour continuous heavy load operation of smelting, energy storage, and chemical production equipment
- Bundle Vertical Flame Spread Test Compliance: Complies with GB/T 19666 ZR General Flame Retardant Standard; after ignition, the flame in the densely bundled cable will not spread vertically or horizontally along the cable bundle and will self-extinguish within the specified test time.
- High-Temperature Carbonization Insulation Protection: The thickened flame-retardant XLPE insulation layer forms a dense carbonization barrier under open flame, preventing rapid oxidation and breakdown of the copper core, providing a longer safety window for fire-resistant tripping and manual power disconnection in medium-voltage systems.
- Thermal Aging Stability: After a long-term high-temperature cyclic aging test at 90℃, there is no cracking, powdering, or sharp decrease in insulation resistance, making it suitable for poorly ventilated enclosed pipe racks and sealed heat storage environments.
- Minimum Allowable Bending Radius: 15 times the cable outer diameter (strictest standard for large-diameter medium-voltage cables)
- Static Heavy-Load Compression Resistance: Passes the national standard medium-voltage cable compression destructive test; XLPE insulation layer shows no cracking, delamination, or permanent deformation.
- Laying Environment Temperature Standard: Standard model installation environment ≥ 0℃; low-temperature customized version supports laying at -20℃ without preheating.
- Design Service Life under Standard Buried and Pipe Gallery Laying Conditions: Over 38 years, longer than low-voltage flame-retardant PVC insulated cables.
- Damp Heat Resistance: Passes long-term continuous damp heat immersion aging test; suitable for laying in water-rich foundations in factory cable trenches and river embankment municipal pipe galleries.
- Chemical Corrosion Resistance: Resistant to long-term corrosion from weak soil acids, weak alkalis, chloride ions, and trace industrial chemical residues.
When ordinary non-flame-retardant YJV22 8.7/15kV medium-voltage cables are densely bundled in enclosed chemical plant pipeline tunnels, they can form continuous flame spread channels, failing fire safety acceptance. Single-layer unarmored flame-retardant medium-voltage cables cannot withstand damage caused by underground compression and construction impacts. The ZR-YJV22 8.7/15kV uses flame-retardant modified thickened XLPE insulation and double-layer steel tape mechanical armor, simultaneously solving the risks of fire spread and underground mechanical damage. It is the mandatory cable type specified by power and fire protection design institutes for all 15kV industrial power distribution projects with fire risks. Electrical engineers prioritize this model to avoid project rework, cable replacement, and delayed acceptance due to inadequate fire resistance or mechanical performance.
Compared to PVC insulated flame-retardant medium-voltage cables with a long-term allowable temperature of only 70℃, ZR-YJV22 flame-retardant cross-linked polyethylene (XLPE) insulated cables can operate stably for extended periods at 90℃, and offer higher continuous current carrying capacity for the same cross-sectional dimensions. For large smelters, centralized energy storage booster stations, and chemical industrial parks where high-load heat accumulation occurs year-round, this characteristic effectively prevents overheating, accelerated partial discharge, and premature insulation aging in medium-voltage cables during peak electricity consumption periods, while maintaining complete flame-retardant safety performance, achieving the dual advantages of high transmission efficiency and fire resistance.
The ZR-YJV22 8.7/15kV three-core specification library covers cross-sections from 16mm² to 630mm², perfectly matching integrated industrial park applications such as small auxiliary box-type transformer incoming lines, medium-sized workshop trunk lines, and main feeders of large central substations. Industrial EPC contractors only need to select one supplier to complete the procurement of flame-retardant medium-voltage armored cables for the entire park project, simplifying procurement classification, incoming material sampling inspection, and on-site temporary warehouse material management, and reducing the labor costs of multi-supplier communication and document organization.
The ZR-YJV22 three-core cable uses a non-hygroscopic flame-retardant elastic filler for overall arc forming, resulting in a smooth outer sheath surface and low friction coefficient. In long-distance pipe laying construction in municipal and chemical pipeline corridors, its traction resistance is significantly lower than that of irregularly filled medium-voltage cables, thereby reducing the configuration requirements of traction winch equipment and shortening the overall construction cycle for medium-voltage cabling.
The ZR dedicated medium-voltage flame-retardant cable automated production line is equipped with real-time online monitoring equipment to monitor the uniformity of flame-retardant raw material mixing, the thickness of 15kV special insulation, the overlap rate of the copper tape shielding layer, and the tightness of the steel tape armor layer winding. The flame retardant performance, insulation thickness, and electrical parameters of each batch are strictly controlled within a narrow standard tolerance range, eliminating the risk of inconsistent flame retardant ratings, insufficient insulation thickness, or unstable current carrying capacity between different cable reels, and avoiding delays in acceptance by the power bureau and fire department due to unqualified batches of medium-voltage cables.
- Large Heavy Industrial Parks: 15kV transformer incoming cables for metal smelting and processing plants; medium-voltage main lines for underground utility tunnels in fine chemical and pharmaceutical parks; buried power distribution lines around hazardous raw material warehouses.
- Municipal Integrated Utility Tunnel Projects: Integrated low-voltage and medium-voltage power cables for urban center integrated utility tunnels; buried flame-retardant armored cables for centralized 15kV power distribution networks in newly built industrial zones; medium-voltage lines crossing municipal trunk roads.
- Large-Scale New Energy Infrastructure: Medium-voltage transmission main lines for gigabit-level centralized photovoltaic booster stations; 15kV buried power cables for shared energy storage stations; medium-voltage connection lines for onshore wind farms.
- Large-Scale Public Infrastructure: Buried cables for 15kV substations dedicated to Class A and Class III hospitals; medium-voltage power distribution lines for industrial zones supporting airports; flame-retardant incoming cables for large logistics heavy-duty transformers.
A 200,000-square-meter comprehensive fine chemical industrial park constructed a fully enclosed underground utility tunnel. All medium-voltage buried trunk lines within the tunnel uniformly adopted ZB-grade ZR-YJV22 8.7/15kV three-core cables. The tunnel space was enclosed, resulting in poor natural heat dissipation, and the surrounding soil contained residual weakly acidic pharmaceutical wastewater. The reinforced, chemically resistant, flame-retardant outer sheath and all-copper tape shielding structure effectively resisted long-term internal heat accumulation and underground chemical corrosion, while also effectively isolating electromagnetic interference to adjacent DCS production monitoring optical cables. The complete set of medium-voltage flame-retardant testing and certification documents provided by our factory passed the park's safety supervision and power bureau acceptance on the first attempt, without requiring additional sampling testing. After four years of continuous 24-hour production operation, no partial discharge, insulation aging or fire hazard faults occurred, reducing the daily manual input for medium-voltage circuit inspection in the park by 78%.
A large-scale ground-mounted photovoltaic power station EPC project selected ZC flame-retardant modified ZR-YJV22 8.7/15kV three-core cable as the main medium-voltage gathering and transmission line between the substation and thousands of photovoltaic combiner boxes. The project site is subjected to long-term intense ultraviolet radiation, and the local soil has high chloride residue levels. The UV-resistant and flame-retardant outer sheath and double-layer steel strip armor enable it to withstand the harsh open-air buried environment and the crushing impact of heavy construction vehicles during the early stages of power station construction. Standardized, complete sets of medium-voltage fire protection certification documents accelerated the grid connection review process for the new energy EPC contractor, enabling the project to achieve full-load power generation 18 days ahead of schedule, and preventing any medium-voltage cable fires or failures during the summer peak power generation period.
A Grade A tertiary hospital in a certain region underwent power grid expansion and renovation, requiring the laying of ZC-grade ZR-YJV22 8.7/15kV three-core armored cables for the underground incoming lines of two dedicated 2500kVA transformers. The hospital's medium-voltage power supply is a forced uninterrupted power supply system. The underground cable trenches are adjacent to medical waste storage and disinfection workshops, posing a potential risk of open flame. The ZR flame-retardant thickened cross-linked polyethylene (XLPE) structure forms a carbonized protective layer in the event of accidental ignition, extending the safe power supply maintenance time for life support medical equipment. The double-layer steel tape armor prevents insulation damage caused by underground pipeline maintenance and mechanical excavation. Stable batch electrical parameters eliminate the risk of localized overheating of medical equipment during peak winter and summer power consumption periods, reducing annual underground medium-voltage line maintenance and equipment downtime losses by more than 86%.
- Flame Retardant Rating Classification Matching Rules: ZC-grade ZR-YJV22 8.7/15kV cables are selected for ordinary municipal industrial areas and logistics parks; chemical, pharmaceutical, and energy storage enclosed pipe gallery projects are upgraded to ZB-grade; long-distance fully enclosed municipal integrated pipe gallery projects adopt ZA-grade high-grade flame-retardant cables according to the mandatory requirements of local fire protection regulations.
- Transformer Load and Transmission Distance Matching Logic: Cross-linked polyethylene (XLPE) cables with a high temperature resistance of 90℃ are suitable for medium-voltage transmission above 500 meters underground; for transmission distances exceeding 800 meters, the transformer rated capacity, total cable length, and annual average load rate must be submitted to our internal medium-voltage technical team for free voltage drop simulation calculations to avoid excessive terminal voltage deviation affecting the stable operation of heavy-duty industrial and medical equipment.
- Installation Environment Customization Rules: Standard ZR-YJV22 is suitable for neutral soil in ordinary urban areas; reinforced chemical corrosion resistant and flame retardant type is suitable for chemical industrial parks and soil with residual industrial wastewater; low temperature resistant type is suitable for municipal 15kV power grid renovation projects in northern mountainous industrial areas.
- Mandatory Shielding Structure Confirmation: All ZR-YJV22 8.7/15kV cables laid in enclosed pipeline corridors and chemical industrial parks must retain a complete and continuous copper tape metal shielding layer to suppress strong electromagnetic interference to adjacent production monitoring, communication, and fiber optic low-current cables.
- Ambient Temperature Control Requirements: The ambient temperature for laying standard ZR-YJV22 medium voltage cables must not be lower than 0℃. In low-temperature industrial areas during winter, low-temperature flame-retardant modified sheath models must be selected to prevent brittle cracking of the outer sheath during long-distance bending operations of large-diameter medium voltage cables.
- Bending Radius Limitation Standards: The bending radius for all bends, conduit installations, and transformer/distribution cabinet terminal connections must be ≥ 15 times the cable's outer diameter. Forced sharp-angle bending is prohibited to prevent cracking of the internal thick XLPE medium voltage insulation layer and the risk of concealed partial discharge and fire spread.
- Fire prevention and heat dissipation requirements for parallel cable bundling: In cable trenches and pipe corridors, sufficient heat dissipation gaps should be reserved between parallel ZR-YJV22 flame-retardant medium-voltage cables to avoid excessive dense stacking that leads to heat accumulation and a decrease in actual current carrying capacity; fireproof partitions should be used to separate medium-voltage, low-voltage and weak current cable laying areas to prevent cross-spread of flames in a fire accident.
- Reinforcement and protection measures at municipal and factory road intersections: Lay a thick reinforced concrete protective layer above the cable layer under the heavy vehicle access road and municipal main road in the factory area to withstand long-term rolling loads from heavy vehicles; reserve sufficient cable length at both ends of the 15kV transformer and distribution cabinet for future replacement of medium-voltage cable terminals and circuit fault repair.
- Before the acceptance work begins, check the batch factory inspection certificate, the third-party ZR-grade flame-retardant full-type medium-voltage cable test report, and the copper material raw material certificate.
- After the cable laying and medium-voltage cable terminal manufacturing are completed, complete the power frequency withstand voltage test and long-term partial discharge test.
- Measure the insulation resistance value of each phase core wire to ensure that all test data meet the national 8.7/15kV medium-voltage flame-retardant power cable acceptance standard.
- Complete the reliable grounding connection of the copper tape shielding layer and double-layer steel tape armor layer, and test the grounding resistance to ensure that it meets the safety operation specifications of industrial parks, hospitals, and municipal medium-voltage power grids.
Each delivery includes a complete set of official certification materials stamped by the factory free of charge: National Power Industry Authoritative Medium-Voltage Full-Type Test Report, GB/T 19666 ZR Flame Retardant Special Inspection Certificate, IEC Certificate of Conformity, CE Certification Documents, Copper Raw Material Certificate of Origin, Batch Production Inspection Records, and Professional ZR-YJV22 Medium-Voltage Pipe Gallery and Underground Laying Guidance Manual. These documents fully meet the requirements for industrial park safety supervision and filing, construction supervision review, chemical plant fire protection acceptance, and customs clearance for overseas medium-voltage industrial EPC projects, avoiding delays in the construction cycle of large-scale industrial projects due to incomplete medium-voltage flame retardant certification materials.
Our professional ZR medium-voltage flame-retardant cable R&D team provides free consultation services: calculation of full-load current carrying capacity of industrial large-capacity transformers, simulation of voltage drop in long-distance enclosed pipe corridors, recommendation of cable cross-section and flame-retardant rating ZA/ZB/ZC matching, and optimized design of overall fireproof laying schemes for chemical industrial parks. For large-scale orders in large chemical industrial parks, gigabit new energy projects, and municipal integrated pipe corridors, professional medium-voltage engineers provide remote video on-site construction guidance, promptly helping construction teams solve technical problems such as large-diameter cable traction, medium-voltage terminal manufacturing, and fireproof acceptance.
We have established long-term, exclusive strategic supply partnerships with top-tier T2 oxygen-free copper smelters and certified high-efficiency flame-retardant cross-linked polyethylene (XLPE) raw material manufacturers, completely eliminating the use of recycled copper and inferior non-flame-retardant plastic raw materials. Each batch of products undergoes full-bundle flame-retardant and medium-voltage laboratory performance testing before delivery; the mixing ratio of flame-retardant materials, the thickness of 15kV special insulation, and the tightness of steel tape armor wrapping are monitored online in real time throughout the process to ensure the flame-retardant safety and stable medium-voltage electrical performance of all cable reels, eliminating fire safety and partial discharge hazards in densely bundled pipe gallery projects.
We have a dedicated intelligent automated production workshop for ZR-YJV22 8.7/15kV cables, with ample inventory of mainstream three-core standard specifications, ready for immediate shipment. For key chemical industrial parks, new energy booster stations, and municipal utility tunnel EPC projects, we prioritize the production of customized high-grade flame-retardant, chemically resistant, and low-temperature modified ZR-YJV22 medium-voltage cables to fully meet the urgent construction schedule requirements of high-risk medium-voltage engineering contractors.
Each roll of medium-voltage cable is printed with a unique production batch number, production date, voltage rating, and core specifications, enabling full traceability from raw material supply to finished product delivery. Large-scale orders of medium-voltage cables for major industrial, new energy, and medical institutions are eligible for extended factory quality guarantees. If, during the warranty period, non-human-caused damage results in flame retardant failure, medium-voltage insulation aging, or armor damage due to factory manufacturing defects, we will provide free replacement and full cable replacement services to minimize the risk of large-scale medium-voltage power outages and reduce fire safety hazards for purchasers and long-term industrial EPC project partners.
The ZR-YJV22 8.7/15kV three-core flame-retardant XLPE steel-tape armored medium-voltage cable is the standard flame-retardant medium-voltage cable designated for power distribution projects in global fire-risk chemical industrial parks, municipal integrated pipe corridors, large-scale new energy booster stations, and dedicated 15kV substations for hospitals. It is widely recognized and recommended by power design institutes, industrial park construction supervision units, and global heavy industry EPC general contractors. This cable adopts ZR's unique bundled flame-retardant thickened medium-voltage insulation structure, possessing 90℃ high-temperature heavy current transmission performance and all-round double-layer steel tape mechanical damage resistance protection. This allows it to adapt to various complex enclosed underground fire-risk medium-voltage laying environments, reasonably balancing the initial industrial project procurement investment for project owners and contractors with long-term fire safety maintenance costs.
Our factory integrates independent R&D of medium-voltage flame-retardant cables, intelligent automated dedicated medium-voltage production lines, and a fully standardized high-voltage flame-retardant testing laboratory. We focus on providing stable, fully fireproof, and cost-effective ZR-YJV22 8.7/15kV series armored cables to users in the global chemical and heavy industries, municipal utility tunnels, large-scale new energy, and public medical infrastructure sectors. We support long-term, stable, and bulk supply cooperation for various fire-sensitive 15kV medium-voltage power distribution projects.
