High-Temperature Resistant XLPE Flame Retardant Cable for Factory Trench & Underground Direct Burial
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Model Description (for purchasing and engineering personnel reference): ZR indicates that the flame-retardant performance meets the domestic GB/T19666 and international IEC60332-3 combustion test standards; YJ indicates the cross-linked polyethylene insulation layer, distinguishing it from traditional PVC insulated cables; V indicates the extruded PVC inner sheath; the number 22 indicates a double-layer steel tape armor structure with a black PVC outer sheath. Rated voltage 0.6/1kV is suitable for conventional civil and industrial 380V/220V low-voltage power grid layouts, covering most mainstream power distribution scenarios in modern building and infrastructure projects. Our core configurations include single-core, dual-core, triple-core, quad-core, and five-core cables, as well as customized asymmetric composite core structures, such as 3+1 cores and 4+1 cores, to match various power cable standards such as TN-S and TN-C-S. Conductor cross-sectional areas range from 1.5mm² to 500mm², meeting the light, medium, and heavy power supply needs of different engineering projects.
This cable uses high-purity oxygen-free electrolytic copper (purity exceeding 99.9%) as the conductive core material, processed with a precision multi-layer stranding process to ensure a compact conductor structure and extremely low inherent resistance, effectively reducing energy loss and voltage drop during long-distance power transmission. The XLPE insulation layer is made using a continuous high-temperature cross-linking process, allowing it to operate continuously at temperatures up to 90 degrees Celsius, far exceeding the temperature limit of ordinary PVC insulated cables. Furthermore, under short-circuit faults, the insulation material can withstand instantaneous temperatures of 250 degrees Celsius within 5 seconds without core melting or insulation breakdown. The finished cable maintains excellent insulation performance after production and has passed a 1000V withstand voltage factory inspection, demonstrating stable insulation performance even in humid environments and with varying temperature differences. The entire cable can operate normally within an ambient temperature range of -10℃ to +90℃, and laying can be carried out smoothly even above zero degrees Celsius. Under extremely low temperature construction conditions, preheating treatment can be performed before laying to prevent cracking of the outer sheath. For multi-core finished cables, the minimum allowable bending radius is controlled within 15 times the cable's outer diameter to guide on-site construction personnel in standardized laying operations and prevent excessive bending from causing the internal insulation layer to crack.
From the inside out, the complete cable layered structure includes stranded copper conductors, uniformly extruded XLPE insulation, tightly wrapped PVC inner sheath, overlapping double-layer steel tape armor, and weather-resistant black PVC outer sheath, with each layer designed to provide targeted protection and performance enhancement.
Our ZR-YJV22 series cables can be customized to achieve A/B/C three-level flame retardant performance according to the fire protection standards required by customer projects. Finished cables undergo bundled burning tests in strict accordance with GB/T19666 and IEC international testing standards. In the event of a fire, the cable can effectively inhibit the continuous spread of flames along the laying path and block the fire path formed by the cable bundle. Using low-smoke flame-retardant raw materials, it can reduce the release of dense smoke and harmful gases in the event of accidental combustion, significantly improving the safety factor of personnel evacuation in enclosed spaces such as underground garages, equipment rooms, tunnels, and electrical shafts in high-rise buildings, becoming a core safety guarantee in fire protection engineering procurement standards. Unlike ordinary non-flame-retardant armored cables, our flame-retardant modification process is applied to both the insulation layer and the outer sheath, rather than a simple surface coating, thus ensuring a long-lasting flame-retardant effect throughout the long service life.
The double-layer overlapping steel strip armor is the core highlight of the YJV22 structure. During the production process, high-quality cold-rolled steel strips are wound with an overlap rate of over 20% to form a rigid protective layer, effectively resisting damage from soil compression, sharp rock scraping, external construction machinery impact, and rodent bites during direct burial. Compared with unarmored YJV cables, this armored structure eliminates the need for additional steel pipe or concrete protective sleeve laying costs during underground construction, saving on auxiliary materials and construction time costs. The integral cable structure has excellent tensile strength, meeting the requirements for high-rise vertical shaft laying and long-span overhead bridge laying. Under its own weight load, there will be no internal core wire misalignment or structural deformation. The overall design can guarantee stable operation for more than 30 years under normal working conditions.
High-purity oxygen-free copper conductors significantly reduce line power consumption in long-distance power supply projects, helping owners and factories reduce monthly electricity costs due to line losses. Homogeneous cross-linked polyethylene insulation possesses excellent dielectric stability; even under long-term high-temperature operation or humid environment corrosion, its insulation performance will not rapidly decline, avoiding potential hazards such as insulation aging leakage and intermittent circuit failures. Excellent short-circuit high-temperature resistance effectively reduces the risk of equipment power outages caused by sudden short-circuit faults, reducing the frequency of equipment maintenance and circuit repair for project owners.
The outer PVC sheath incorporates UV-resistant, acid and alkali-resistant, and salt spray-resistant additives during the formulation process, enabling the finished cable to withstand high-salt-spray and humid coastal environments, weak acid and alkali corrosive environments in chemical industrial parks, and long-term outdoor sun exposure. The inner sheath effectively isolates the armor layer and insulation layer, preventing underground water seepage from corroding the internal insulation structure. Therefore, this cable requires no additional anti-corrosion treatment and can be used in various complex laying environments such as cable trenches, direct underground burial, sealed integrated pipe corridors, and indoor cable trays.
A single cable product can meet the needs of various laying methods, including direct burial, conduit installation, bridge erection, tunnel cabling, and indoor concealed installation. A single purchase can meet the cabling needs of multiple areas in a large project, reducing the types of spare parts and inventory costs for the purchaser. With a long service life and low failure rate, it can reduce post-project operation and maintenance costs over a service life of several decades. The overall cost of ownership is significantly better than that of cheap, low-quality recycled copper cables on the market.
Primarily serving the main power supply lines for factory workshops, fixed power distribution circuits for heavy production equipment, power supply wiring for power plant auxiliary equipment, transmission lines in non-explosive hazardous areas of chemical industrial parks, and power layout for metallurgical plant ground workshops.
The project encompassed multiple production workshops and comprehensive underground cable trenches. The construction environment required some weak chemical vapor phase corrosion and some direct burial installations. The client selected various specifications of our ZR-YJV22 series products, including two models: 4×50+1×25 and 3×95+1×50. Our customized Class A flame-retardant products met the park's high fire protection requirements, and the steel strip armor addressed the needs for pressure resistance and corrosion resistance during burial. The project operated stably for three years after completion without any circuit failures. The client renewed the framework procurement cooperation agreement for the subsequent second-phase expansion project of the industrial park.
Suitable for main power supply shaft trunk lines in high-rise residential buildings, power distribution in underground parking garages of large shopping malls, power supply circuits for critical medical equipment in tertiary hospitals, and emergency power supply circuits for theaters and large public sports venues.
Local building codes required high-standard flame-retardant materials for the main incoming power cables and emergency lighting wiring. The construction team selected our company's ZR-YJV22 series 5×16 and 4×35+1×16 cables. XLPE's high-temperature resistance was suitable for the heat storage environment of enclosed electrical shafts, and its flame-retardant performance successfully passed local building fire protection inspections. The completed project passed government project acceptance on the first attempt, and the local general contractor subsequently established a long-term spot supply cooperation relationship with our company.
Suitable for underground power grid upgrades in urban residential areas, power cable installation for streetlights on municipal roads, integrated power distribution layouts for urban underground utility tunnels, and auxiliary power supply circuits for rail transit station depots, etc.
The tunnel's internal environment was enclosed and humid, requiring frequent pipeline maintenance and posing a risk of mechanical collisions. The project engineering department selected our ZR-YJV22-4x70+1x35 specification cable as the main power distribution cable. The moisture-proof outer sheath and armored structure effectively coped with the high humidity and accidental collision damage inside the tunnel. All cabling sections operated stably in the high humidity environment for two years after delivery.
Suitable for cabling installations in salt spray corrosion areas of coastal cities, outdoor fixed installations in inland cold regions, power distribution projects around high-risk fire warehouses, and transformer support circuits installed along mountain roads, etc.
Before ordering, engineers need to confirm that the target flame retardant rating matches the project's fire protection rating. For high-risk fire protection projects, Class A flame retardant specifications should be selected, while for general civilian projects, Class B or C can be chosen to reasonably control procurement costs. Engineers need to confirm the actual rated operating voltage of the power system, strictly stipulating that low-voltage systems below 1kV should only use cables with a rated voltage of 0.6/1kV to avoid potential safety hazards caused by voltage mismatch. Engineers need to specify the laying environment, including direct burial, indoor shafts, or chemically corrosive areas, to determine the appropriate customized outer sheath raw material formula. Before bulk orders, the purchaser needs to request complete third-party test reports and qualification certificates from the supplier, focusing on raw material specifications and confirming that the conductor uses new electrolytic copper, rather than recycled scrap copper that may cause unstable resistance and short service life.
During direct burial construction, ensure the cable burial depth exceeds 70 cm, and lay fine sand around the cable to isolate sharp stones and prevent scratches to the armor layer. All double-steel-tape armored terminals must use a reliable grounding structure at both ends, with the grounding resistance controlled below 4 ohms to achieve lightning protection and eliminate induced current. Flame-retardant accessories should be selected for the terminals to maintain the consistency of the flame-retardant performance of the entire circuit. It is strictly prohibited to use this ZR-YJV22 power cable as a substitute for low-current signal control cables for wiring construction. Furthermore, this product has not obtained coal mine safety certification and therefore must not be used in underground roadways.
We support comprehensive personalized customization services, including flame retardancy rating adjustments, core material combination optimization, non-standard cross-sectional size development, and fixed delivery length cutting according to customers' specific engineering drawings. Whether it's a small-batch sample trial order for engineering sample inspection or a large-volume framework order for large-scale municipal bidding projects, our production line can flexibly arrange production plans to meet the diverse order needs of engineering purchasers.
All raw materials, including copper rods, cross-linked polyethylene granules, steel strips, and PVC compounds, are sourced from reputable and qualified large-scale upstream factories and undergo incoming material inspection before warehousing. Finished products are monitored online in real-time during extrusion, stranding, and armoring processes. Each batch of finished products undergoes routine factory testing, including conductor resistance testing, insulation withstand voltage testing, and flame retardant combustion sampling testing. We can provide a complete set of factory inspection reports, third-party testing documents, CCC certification, and ISO quality system certification documents to assist buyers in completing project tender documents and project acceptance procedures.
Our in-house professional electrical engineering team provides free pre-sales technical consultation services, including load current calculation, specification and model selection advice, and on-site installation optimization guidance to support customers' new projects. After the goods arrive, if the buyer encounters any problems during on-site installation, our technicians can provide remote online wiring guidance at any time. For large overseas projects, we can arrange technical liaison and communication to efficiently resolve project matching issues.
We have a fully automated, integrated cable production workshop equipped with a complete set of advanced production equipment, eliminating middlemen and their markups, allowing us to offer preferential factory direct prices to bulk purchasing customers. Sufficient inventory of standard specifications ensures rapid response to urgent orders, while customized non-standard products can be produced within reasonable timeframes, guaranteeing on-time delivery and preventing project delays due to supply disruptions.
For engineering companies and import trading clients with recurring bulk purchasing needs, we can develop exclusive long-term cooperation pricing systems and priority production scheduling policies. We regularly update the latest product technical specifications and industry standard revision notices to help buyers stay informed about changes in local engineering acceptance regulations.
