Flame Retardant Fire Resistant Power Cable Wire Copper Fireproof Insulation XLPE/LSZH 4c X 240mm2 Cable

The flame retardant fire resistant power cable with 4c×240mm² specification comes with a set of precise and comprehensive parameters that determine its performance and application scope in various high-safety-demand scenarios.

In terms of core structure, the "4c×240mm²" clearly indicates that the cable consists of 4 Cores, each with a conductor cross-sectional area of 240mm². This 4-core design is particularly suitable for three-phase four-wire power systems, where three cores are used for phase lines (A, B, C) and the fourth core serves as the neutral line, ensuring balanced current distribution and stable operation of the power system. It can also be applied in other multi-phase power systems, meeting the requirements of large-capacity power transmission.

The current-carrying capacity is a key parameter reflecting the cable's power transmission capability. At an ambient temperature of 25℃, each core of this cable has a long-term allowable current-carrying capacity of approximately 400A. Based on the calculation formula of power (P = √3×U×I×cosφ, where U is the voltage, I is the current, and cosφ is the power factor, typically 0.85 for industrial equipment), under a rated voltage of 0.6/1kV, the power that each core can carry is about 88kW. This means the entire cable can support a total power transmission of hundreds of kilowatts, which is sufficient for power supply in large equipment, densely populated areas, and key industrial facilities.

The rated voltage of the cable is usually 0.6/1kV, which is applicable to most low-voltage power distribution systems. For some special scenarios with higher voltage requirements, there are models that can reach higher voltage levels such as 6kV and 10kV, ensuring compatibility with different voltage-grade power distribution systems. This Flexibility in voltage rating expands its application range in various industrial and civil fields.

The physical dimensions of the cable are also carefully designed. Its outer diameter is approximately 65mm, which is determined by factors such as the number of cores, conductor cross-sectional area, insulation layer thickness, and sheath thickness. This size allows the cable to be laid in common cable trenches, conduits, and cable trays without excessive space occupation, while also ensuring sufficient mechanical strength. The XLPE insulation layer surrounding each core has a thickness of about 2.2mm, which provides excellent electrical insulation performance, preventing current leakage between cores and ensuring safe power transmission. The LSZH sheath, as the outermost protective layer, has a thickness of about 3.0mm, offering strong mechanical protection and flame retardant properties.

Other important parameters include conductor resistance and short-circuit withstand temperature. At 20℃, the maximum DC resistance of each 240mm² Copper Conductor is not more than 0.0779Ω/km, ensuring low power loss during transmission. In case of a short circuit, the cable can withstand a high temperature of 130℃ for a short period, which is crucial for maintaining power supply stability during fault conditions. Additionally, the cable has a minimum bending radius of 12 times its outer diameter for fixed installations, ensuring that it can be bent without damaging the insulation and cores during installation.

The flame retardant fire resistant power cable (4c×240mm²) is widely used in various fields that have strict requirements for fire safety and power supply continuity, thanks to its excellent performance.

In high-rise buildings, this cable plays a vital role in the power supply system. It is used as the main distribution trunk, running through key parts such as stairwells, elevator shafts, and pipe wells. These areas are critical for personnel evacuation and fire fighting in case of a fire. The cable provides power to essential facilities such as fire alarm systems, sprinkler systems, emergency lighting, and elevators. Even when a fire breaks out, its fire resistance ensures that it can maintain power transmission for a certain period (usually 90 minutes or more), buying valuable time for personnel evacuation and fire rescue operations.

Large-scale public places with dense crowds, such as shopping malls, hospitals, and subway stations, also rely heavily on this cable. In shopping malls, it supplies power to lighting systems, escalators, air conditioning systems, and emergency equipment. Its flame retardant property can prevent the fire from spreading along the cable, reducing the risk of fire expansion. In hospitals, where the safety of patients and medical equipment is paramount, the cable ensures the continuous operation of life support systems, operating room equipment, and Emergency Power Supply systems. In subway stations, which are enclosed spaces, the low smoke and halogen-free characteristics of the LSZH sheath minimize the harm caused by toxic gases and smoke in case of a fire, protecting the safety of passengers and staff.

In industrial fields, especially in industries with flammable and explosive risks such as chemical, metallurgical, and textile industries, this cable is an ideal choice for power transmission. It is used to connect key production equipment, such as reaction vessels, smelting furnaces, and textile machinery, as well as emergency power supplies. In the event of a fire, the cable's fire resistance and flame retardancy prevent power interruptions due to cable damage, avoiding production stoppages and the expansion of accidents. It can also withstand the harsh environments in these industries, such as high temperatures, humidity, and chemical corrosion.

Data centers and nuclear power plants, which have extremely high requirements for power supply continuity, also use this cable extensively. Data centers house a large number of servers and network equipment, and even a short power outage can lead to huge economic losses. The cable ensures the stable operation of the power supply system, even in fire emergencies. In nuclear power plants, where safety is the top priority, the cable is used in important systems such as reactor control systems and emergency cooling systems, relying on its excellent fire resistance and reliability to ensure the safe operation of the nuclear power plant.

Furthermore, this cable is applicable to tunnel projects, power plants, and large-scale industrial parks. In tunnels, it provides power for lighting, ventilation, and communication systems, with its flame retardant and fire resistant properties adapting to the closed environment of tunnels. In power plants, it is used in auxiliary power systems to ensure the normal operation of auxiliary equipment. In industrial parks, it connects various factories and facilities, forming a safe and reliable power supply network.

The flame retardant fire resistant power cable (4c×240mm²) adopts high-quality materials and a scientific design style, which together contribute to its excellent performance and safety.

The conductor is made of high-purity electrolytic copper with a purity of ≥99.95%. This high purity ensures excellent electrical conductivity, which is essential for reducing power loss during transmission. Compared with other conductive materials, copper has better conductivity, allowing for efficient transmission of electrical energy. In addition, electrolytic copper has good ductility and mechanical toughness. It can be drawn into thin wires and twisted into conductors of the required cross-sectional area, and during installation and use, it can withstand a certain degree of bending and stretching without breaking, ensuring the stability and service life of the cable. Moreover, the copper conductor has good oxidation resistance, which can resist corrosion in high-temperature and humid environments, maintaining stable conductive performance.

The insulation layer is made of cross-linked polyethylene (XLPE) 经过特殊处理. XLPE has excellent heat resistance, enabling the cable to work continuously at 90℃ and withstand short-term high temperatures of 130℃ in case of a short circuit, which is crucial for maintaining insulation performance in high-temperature environments. It also has high insulation resistance and good corona resistance, effectively preventing current leakage and corona discharge, ensuring the safety of power transmission. The cross-linking process of XLPE forms a three-dimensional network structure, enhancing its mechanical strength, Chemical Resistance, and aging resistance, making it suitable for long-term use in various harsh environments.

The outer sheath is made of low smoke zero halogen (LSZH) material, which is a key feature that distinguishes this cable from ordinary cables. LSZH material does not contain halogen elements (such as chlorine, bromine, etc.), so when it burns, it does not release toxic halogenated gases (such as hydrogen chloride, hydrogen bromide), which can cause serious harm to human respiratory systems and equipment. At the same time, its smoke emission is extremely low, which helps maintain visibility in fire situations, facilitating personnel evacuation and fire fighting. In addition, LSZH sheath has good flame retardancy, which can inhibit the spread of fire when exposed to flame. It also has excellent corrosion resistance, resisting the erosion of acids, alkalis, oils, and other chemicals, and has good weather resistance, adapting to both indoor and outdoor environments.

In terms of style, the cable has a compact and round structure. The 4 Cores are twisted together in a certain way, which not only reduces the overall volume of the cable but also ensures uniform stress distribution during bending and laying. The surface of the LSZH sheath is smooth, which reduces friction during laying, making it easier to install in conduits and cable trays. The sheath is usually colored in orange or red, which are warning colors, making it easy to identify in complex cable environments and reminding installers and maintenance personnel of its special function and importance.

The production process of the flame retardant fire resistant power cable (4c×240mm²) is a sophisticated and strictly controlled process, involving multiple steps to ensure the cable meets high standards of flame retardancy, fire resistance, and electrical performance.

The first step is conductor manufacturing. High-purity electrolytic copper rods are used as raw materials. These copper rods are first cleaned to remove surface impurities, then undergo a wire drawing process. Through a series of dies with decreasing diameters, the copper rods are drawn into Copper Wires of the required diameter. The drawn copper wires are then annealed, which involves heating them to a specific temperature (around 500℃) in a protective atmosphere (such as nitrogen) to eliminate internal stress, improve ductility, and enhance conductivity. After annealing, multiple copper wires are twisted together by a stranding machine to form a 240mm² conductor. The stranding process ensures that the conductor has a compact structure and uniform cross-sectional area, which is beneficial for improving current-carrying capacity and mechanical strength.

Next is the insulation extrusion. Each twisted copper conductor is fed into an XLPE insulation extrusion line. The XLPE material is first dried to remove moisture, as moisture can affect the insulation performance. The dried XLPE is then melted in the extruder and evenly extruded onto the surface of the conductor to form an insulation layer with a thickness of about 2.2mm. During extrusion, parameters such as temperature, pressure, and speed are precisely controlled to ensure the insulation layer is uniform in thickness, has a smooth surface, and is tightly bonded to the conductor. After extrusion, the Insulated Conductor enters a cross-linking tube, where it undergoes a cross-linking reaction under high temperature and pressure (using steam or nitrogen). This cross-linking process transforms the linear molecular structure of XLPE into a three-dimensional network structure, significantly improving its heat resistance, mechanical strength, and insulation performance.

After the insulation of each core is completed, the 4 Insulated Cores enter the cabling stage. The 4 cores are twisted together in a specific lay length by a cabling machine. During cabling, a filling material (usually non-halogen flame retardant material) is added between the cores to ensure the cable has a round and stable structure, preventing core displacement during subsequent processing and use. A binding tape is wrapped around the twisted cores to further fix their positions.

The next step is sheath extrusion. The cabled cores are fed into an LSZH sheath extrusion line. The LSZH material, which is pre-mixed with flame retardant additives and other functional components, is melted in the extruder and extruded onto the surface of the cabled cores to form a sheath with a thickness of about 3.0mm. Similar to insulation extrusion, strict control of extrusion parameters ensures that the sheath is uniform in thickness, closely bonded to the inner layer, and has a smooth surface. The LSZH sheath not only provides mechanical protection but also contributes to the flame retardant and low smoke zero halogen properties of the cable.

After sheath extrusion, the cable undergoes a series of post-processing steps. It is cooled in a water tank to solidify the sheath, then dried. A printing machine prints marks such as cable model, specification, rated voltage, manufacturer, and production date on the sheath surface for identification and traceability.

The most critical step is the performance testing. The cable undergoes a series of strict tests, including electrical performance tests (such as insulation resistance test, withstand voltage test, partial discharge test) to verify its insulation and conductive properties; flame retardant test (such as vertical burning test, bundle burning test) to evaluate its flame retardant performance; fire resistance test (such as temperature cycle test, fire resistance duration test) to check its ability to maintain power transmission under high temperature conditions; and mechanical performance tests (such as tensile test, impact test) to assess the strength and toughness of the sheath and insulation layer. Only cables that pass all these tests are allowed to leave the factory.

Throughout the production process, quality control is implemented at each step. Raw materials are inspected upon arrival to ensure they meet specifications. In-process inspections are conducted during wire drawing, stranding, insulation extrusion, cabling, and sheath extrusion to detect and correct defects in a timely manner. Advanced testing equipment and strict testing standards ensure that each cable meets the design requirements and relevant industry standards.

The packaging of the flame retardant fire resistant power cable (4c×240mm²) is designed to protect the cable from damage during storage, transportation, and handling, ensuring that it reaches customers in good condition.

For large-length cables (usually 500 meters or more), wooden reels are used as the main packaging. These reels are made of high-quality hardwood with high strength and durability, which can bear the weight of the cable and resist deformation during transportation. The reels have large flanges, and the diameter of the flanges is designed according to the minimum bending radius of the cable to prevent the cable from being excessively bent during storage and transportation, which could damage the insulation and sheath. The cable is tightly and evenly wound on the reel, and a layer of moisture-proof plastic film is wrapped around the cable before winding to prevent moisture and dust from adhering to the cable surface. The reel is fixed with steel straps to prevent the cable from loosening during transportation. Each reel is labeled with clear information, including cable model, specification (4c×240mm²), length, rated voltage, production batch number, production date, manufacturer's name, and contact information. For export products, the labels also include English information to meet international trade requirements.

For short-length cables (usually 100-500 meters), they are packaged in coils. The cable is wound into a circular coil with a suitable diameter, and the coil is wrapped with a thick flame retardant plastic sheet to protect the cable from mechanical damage and moisture. The coil is then secured with plastic straps to maintain its shape. These coils are often placed in sturdy cardboard boxes or wooden crates for additional protection. The boxes or crates are also labeled with the same information as the reels, making it easy for customers to identify and accept the products.

In addition to the above packaging, for bulk shipments, multiple reels or coils can be palletized. The reels or coils are placed on a wooden or plastic pallet, and then wrapped with stretch film to fix them, which not only improves the efficiency of loading and unloading but also provides additional protection against moisture and dust.

Special attention is paid to the packaging of cables for special environments. For example, when shipping to humid areas, desiccant bags are placed in the packaging to absorb moisture. For cables that need to be stored for a long time, the packaging is designed to be airtight to prevent oxidation of the conductor and aging of the insulation and sheath materials.

The transportation of the flame retardant fire resistant power cable (4c×240mm²) requires careful planning and strict operation to ensure the cable is not damaged during transit and arrives at the destination on time.

The choice of transportation mode depends on the distance, quantity, and destination. For short-distance transportation (within the same city or nearby areas), road transportation using trucks is usually adopted. The trucks used are equipped with appropriate loading and unloading equipment, such as cranes and forklifts, to handle the heavy reels or coils. The cable reels are placed horizontally on the truck bed and secured with steel chains or straps to prevent them from rolling or shifting during transportation. Coils are stacked neatly, with a cushioning material between layers to avoid friction and collision. For long-distance transportation, rail or sea transportation may be more economical. Rail transportation is suitable for large quantities of cables, with the reels or coils placed in railcars and fixed firmly. Sea transportation is used for international shipments, where the cables are packed in containers. The containers are checked for moisture and cleanliness before loading, and the cables are fixed inside the containers to prevent movement during the voyage.

During transportation, it is necessary to protect the cable from extreme weather conditions. In hot weather, the cable should be covered with a sunshade to prevent direct sunlight from causing the sheath to overheat and age. In rainy or snowy weather, waterproof tarpaulins are used to cover the cable to prevent moisture from entering the packaging. In cold weather, especially in areas with extremely low temperatures, measures should be taken to prevent the cable from freezing, as low temperatures may make the sheath brittle and prone to cracking.

Handling during transportation is also crucial. When loading and unloading, appropriate equipment is used, and rough handling such as dropping and collision is strictly prohibited. The cable reels should be lifted from the center axis to avoid damaging the flanges. When moving the reels, they should be rolled along the direction of the flange to prevent tipping.

Transportation personnel need to be trained to understand the characteristics and handling requirements of the cable. They should check the packaging of the cable before transportation to ensure it is intact. During transportation, they should regularly inspect the fixing of the cable to ensure it remains secure. In case of any abnormal situation (such as packaging damage or cable exposure), they should take timely measures to deal with it and report to the relevant department.

Documentation during transportation is also essential. Each shipment is accompanied by a waybill, packing list, invoice, and product qualification certificate. These documents clearly indicate the product information, quantity, destination, and other details, facilitating customs clearance and acceptance by the recipient.

The shipment process of the flame retardant fire resistant power cable (4c×240mm²) is designed to be efficient, transparent, and customer-focused, ensuring that orders are fulfilled accurately and delivered within the agreed timeframe.

Upon receiving a customer's order, the sales team first verifies all details, including the cable specification (4c×240mm²), quantity, delivery address, and requested delivery date. This information is then entered into the company's order management system, which triggers a notification to the warehouse department. The warehouse team checks the inventory to confirm if the required cables are in stock. If available, they prepare the cables for shipment; if not, the production department is immediately informed to prioritize manufacturing, with a clear timeline to meet the delivery deadline.

Before dispatch, each cable undergoes a final quality inspection. This includes verifying the cable's length, marking, and packaging integrity. Random samples are also selected for quick electrical checks to ensure they meet the required standards. Once approved, the cables are loaded onto the designated transportation vehicle, and all necessary documentation is compiled. This documentation includes a detailed packing list, commercial invoice, certificate of conformity, and test reports, which are either attached to the shipment or sent electronically to the customer in advance.

Customers are notified via email or phone as soon as the shipment departs. The notification includes the tracking number, carrier details, and an estimated delivery date, allowing customers to monitor the shipment's progress in real time. For urgent orders, the company offers expedited shipment options, such as air freight for international deliveries or express road transport for domestic orders, ensuring the cables reach the customer as quickly as possible.

Upon arrival at the destination, the customer is required to inspect the shipment for any visible damage. The delivery personnel will ask the customer to sign a delivery receipt, which serves as confirmation of receipt. Any discrepancies or damage must be noted on the receipt and reported to the company within 48 hours. The company’s customer service team then coordinates with the logistics provider to resolve issues such as damaged goods, offering replacements or refunds as appropriate.

The company maintains a comprehensive shipment record, including delivery confirmations and customer feedback, to continuously improve the shipment process. This ensures that any bottlenecks or delays are identified and addressed promptly, enhancing overall customer satisfaction.

Recognizing that customers may need to evaluate the flame retardant fire resistant power cable (4c×240mm²) before placing bulk orders, the company offers a reliable sample service to facilitate informed purchasing decisions.

Customers can request samples by contacting the sales team via phone, email, or the company’s official website. The request should include details such as the customer’s name, company, contact information, and the specific cable specification (4c×240mm²). The sales team responds within 24 hours, providing information on sample availability, associated costs, and estimated delivery time.

Sample cables are typically 1–5 meters in length, sufficient for customers to conduct physical inspections, mechanical tests (e.g., bending, abrasion resistance), and basic electrical checks (e.g., continuity, insulation resistance). These samples are cut from production batches that meet the same quality standards as bulk orders, ensuring they accurately represent the cable’s performance, material quality, and flame retardant properties. Each sample is labeled with key information, including the model, specification, batch number, and production date, for traceability.

Sample fees are minimal, covering only material and processing costs. In most cases, the fee is fully refundable if the customer places a bulk order within 30 days of receiving the sample. Samples are shipped via reputable courier services, with tracking information provided to the customer. Delivery times vary by location but typically range from 3–7 business days for domestic shipments and 7–14 days for international ones.

The company’s technical team is available to assist customers with sample evaluation, providing guidance on testing methods and interpreting results. Feedback from customers on samples is actively sought and used to refine product quality and address any concerns, ensuring that bulk orders meet or exceed expectations.

The company is committed to providing comprehensive after-sales service for the flame retardant fire resistant power cable (4c×240mm²), ensuring long-term customer satisfaction and support throughout the cable’s lifecycle.

The cable comes with a 24-month warranty from the date of delivery. During this period, if the cable fails due to manufacturing defects (e.g., insulation breakdown, sheath cracking, or conductor oxidation) under normal operating conditions, the company will provide free replacement or repair services. To claim the warranty, customers must submit a detailed report of the issue, including photos or videos, along with proof of purchase. The technical team reviews the claim and responds within 48 hours, arranging for replacements or on-site repairs as needed.

A dedicated after-sales hotline and email support are available 24/7 to address customer inquiries. Trained technicians provide prompt assistance with installation guidance, troubleshooting, and technical questions. For complex issues requiring on-site support, the company dispatches technical personnel to the customer’s location within 48 hours for domestic customers and 72 hours for international clients. These technicians conduct on-site inspections, diagnose problems, and implement solutions, such as repairing damaged sections or replacing faulty cables.

The company also offers post-installation services, including periodic maintenance checks. Technicians can inspect the cable’s condition, test its electrical performance, and provide recommendations for extending its service life. For large-scale projects, customized maintenance contracts are available, ensuring regular monitoring and proactive upkeep.

In addition to warranty and technical support, the company maintains a detailed database of customer purchases and service records. This allows for personalized service, such as reminding customers of maintenance schedules or notifying them of product upgrades. Customer feedback on after-sales service is regularly reviewed, with improvements made to streamline processes and enhance responsiveness.

The company’s after-sales team works closely with customers to resolve any disputes amicably, adhering to principles of fairness and transparency. Whether addressing warranty claims, providing technical guidance, or facilitating replacements, the goal is to ensure that customers receive reliable, safe, and high-Performance Cables throughout their operational life.

In summary, the flame retardant fire resistant power cable (4c×240mm²) combines advanced materials, precise manufacturing, and rigorous quality control to deliver exceptional fire safety and electrical performance. Supported by robust packaging, reliable transportation, efficient shipment, and comprehensive after-sales service, it is an ideal choice for high-safety applications where power continuity and fire resistance are critical.