Na2xy-J 4× 95mm² 4× 50mm² 0.6/1kv XLPE Insulated Cable

Both types of cables adopt 4-core high-purity electrolytic Copper Conductors with a purity of ≥99.95%. The 4×95mm² cable has a single-core conductor cross-sectional area of 95mm², and each core is formed by stranding multiple Copper Wires with a diameter of 0.25mm-0.3mm. The stranding pitch is 30mm-35mm, the conductor diameter is approximately 11mm, the DC resistance of a single-core conductor at 20℃ is ≤0.193Ω/km, and the overall weight of the 4-core conductor is about 580kg per kilometer. The 4×50mm² cable has a single-core conductor cross-sectional area of 50mm², also stranded by multiple fine copper wires with a stranding pitch of 25mm-30mm, a conductor diameter of approximately 8.5mm, a single-core DC resistance of ≤0.387Ω/km, and the overall weight of the 4-core conductor is about 310kg per kilometer. Both conductors can withstand a tensile force of ≥10kN, meeting the mechanical strength requirements during laying.

The insulation layer is made of XLPE material. The insulation layer thickness of the 4×95mm² cable is 1.4mm-1.8mm, with the thinnest part not less than 1.2mm, insulation resistance ≥1000MΩ·km, dielectric loss tangent at 50Hz ≤0.003, and breakdown strength ≥20kV/mm. The insulation layer thickness of the 4×50mm² cable is 1.2mm-1.5mm, with the thinnest part not less than 1.0mm, insulation resistance also ≥1000MΩ·km, and the dielectric loss tangent and breakdown strength are consistent with those of the 95mm² specification. After cross-linking treatment, the XLPE insulation layer can reach a long-term operating temperature of 90℃, withstand a temperature of 250℃ during short circuits (within 5 seconds), and maintain good Flexibility in a low-temperature environment of -40℃.

The sheath is made of weather-resistant PVC material. The sheath thickness of the 4×95mm² cable is 1.8mm-2.2mm, with an average thickness of not less than 2.0mm, the thinnest part ≥1.6mm, tensile strength ≥12MPa, elongation at break ≥150%, and oxygen index ≥30. The sheath thickness of the 4×50mm² cable is 1.5mm-1.8mm, with an average thickness of not less than 1.6mm, the thinnest part ≥1.3mm, and the tensile strength and elongation at break are the same as those of the 95mm² specification, with an oxygen index also ≥30. Both sheaths have acid and alkali resistance. After being immersed in 10% concentration hydrochloric acid and sodium hydroxide solutions for 72 hours, the performance change rate is ≤20%.

Both cables have a rated voltage of 0.6/1kv, with a phase voltage of 0.6kv and a line voltage of 1kv. The overall outer diameter of the 4×95mm² cable is approximately 23mm, the bending radius is ≥12 times the outer diameter (about 276mm), and the weight per kilometer is about 850kg; the overall outer diameter of the 4×50mm² cable is approximately 18mm, the bending radius is ≥10 times the outer diameter (about 180mm), and the weight per kilometer is about 520kg. At an ambient temperature of 30℃, the current-carrying capacity of the 4×95mm² cable when laid in air is 240A-260A, and when directly buried, it is 200A-220A; the current-carrying capacity of the 4×50mm² cable when laid in air is 150A-170A, and when directly buried, it is 120A-140A. Both cables have passed various performance tests in the GB/T 12706.1-2020 standard.

The 4×95mm² cable is suitable for power trunk lines of high-power equipment clusters in industrial plants, such as rolling mills in steel plants, large stamping equipment in machinery factories, and reaction kettles in chemical plants. These equipment have high single-machine power and concentrated loads when multiple machines run simultaneously. This specification cable can provide stable high-current transmission. Its long-term temperature resistance of 90℃ can cope with the high-temperature environment during equipment operation, and the aging resistance of XLPE insulation ensures long-term use in industrial environments with more dust and oil stains. The 4×50mm² cable can be used as a branch line in the workshop to supply power to medium-power equipment such as CNC machine tools, small fans, and water pumps. Its flexible bending performance is convenient for laying in equipment-intensive areas.

In commercial complexes, large shopping malls and other places, the 4×95mm² cable can be used for the main power supply lines of central air conditioning systems and large refrigeration units. These equipment have large starting currents and long continuous operation times. The high current-carrying capacity and short-circuit temperature resistance of the cable can ensure their stable operation. At the same time, the bunch flame retardant property reduces the risk of fire, making it suitable for crowded commercial environments. The 4×50mm² cable can be used for distribution branch lines from floor distribution rooms to various merchants, supplying power to lighting systems, cash registers, small air conditioners, etc. Its small outer diameter is convenient for arrangement in small spaces such as ceilings and wall interlayers.

In the municipal street lamp system, the 4×50mm² cable is an ideal choice. Its weather-resistant PVC Sheath can resist outdoor wind, rain, and ultraviolet erosion. When directly buried, it can withstand soil pressure and slight vibration, and its current-carrying capacity meets the simultaneous power supply needs of multiple street lamps. In urban underground pipe gallery projects, the 4×95mm² cable can be used as a regional distribution trunk line. When laid in parallel with other pipelines, its excellent insulation performance and mechanical strength can reduce the risk of mutual interference and damage. In addition, municipal facilities such as sewage treatment plants and garbage treatment stations can also select cables of corresponding specifications according to equipment power, and the acid and alkali resistant sheath can adapt to special environments.

In the power distribution system of office buildings, the 4×95mm² cable can connect the building's main distribution room with each floor's distribution box, undertaking the main power supply task of the entire building. Its efficient conductivity reduces line loss, meeting energy-saving requirements. The 4×50mm² cable is used for branch lines from distribution boxes to each office, supplying power to office equipment such as computers, printers, and air conditioners. Its flexible laying method adapts to the complex wiring needs of office buildings, and its long-term use stability reduces maintenance costs.

The conductor is made of high-purity electrolytic copper, which has undergone electrolytic refining to remove impurities such as iron, zinc, and lead, with a purity of over 99.95%. This high-purity copper has excellent conductivity, with a conductivity of ≥58MS/m, which can effectively reduce energy loss during current transmission. At the same time, electrolytic copper has good ductility and is not easy to break during stranding, ensuring the integrity and mechanical strength of the conductor. In addition, copper has strong oxidation resistance. In a normal use environment, the oxide film formed on the surface can prevent further oxidation, maintaining long-term stable conductivity.

The insulation layer is made of cross-linked polyethylene (XLPE), and the linear molecular structure is transformed into a three-dimensional network structure through a chemical cross-linking process. Compared with ordinary polyethylene, the heat resistance of XLPE is significantly improved, with the long-term operating temperature increased from 70℃ to 90℃. At the same time, it retains good electrical insulation performance, with high insulation resistance and low dielectric loss, which can effectively isolate current leakage between conductors. XLPE also has excellent aging resistance and chemical corrosion resistance, with stable performance in various environments, extending the service life of the cable.

The sheath is made of weather-resistant polyvinyl chloride (PVC), with antioxidants, ultraviolet absorbers, flame retardants and other additives added to the basic PVC formula. Antioxidants and ultraviolet absorbers improve the aging resistance of the sheath, making it not easy to crack or harden in outdoor or high-temperature environments; flame retardants make the oxygen index reach ≥30, with good flame retardant effect; the special plasticizer formula ensures the flexibility of the sheath in low-temperature environments. This PVC sheath also has certain oil resistance and chemical corrosion resistance, adapting to various complex environments.

Both cables have a circular structure, with 4 Cores symmetrically distributed around the center. After stranding, a Compact Cable core is formed, and the outer layer is wrapped with an XLPE insulation layer and a PVC sheath in sequence, with an overall smooth and round structure. The surface of the cable is printed with clear marks, including model specifications (such as Na2xy-J 4×95mm²), rated voltage, manufacturer, meter marks, etc., facilitating identification and cutting. In terms of color, the sheath is usually black, which has good heat absorption and dirt resistance, suitable for outdoor and underground laying scenarios, and can also blend well with the surrounding environment.

First, high-purity electrolytic copper ingots are smelted into copper liquid, and copper rods with a diameter of 8mm-10mm are made through continuous casting. The copper rods are drawn through a wire drawing machine in multiple passes to make fine copper wires with a diameter of 0.25mm-0.3mm. During the wire drawing process, lubricants are used to reduce friction, ensuring the surface of the copper wires is smooth. Then, according to the cross-sectional specifications, a certain number of copper wires are stranded on a stranding machine. Each core of 4×95mm² requires about 200 copper wires, and each core of 4×50mm² requires about 110 copper wires. During stranding, the stranding pitch is controlled to ensure the conductor is round and tight. After stranding, annealing treatment is performed, heating the copper wires to 300℃-400℃ and keeping them warm for a period of time to eliminate internal stress and improve flexibility.

The Stranded Conductor enters the insulation extrusion process. XLPE particles are added to the extruder hopper after drying treatment. The extruder barrel is heated in three sections, with temperatures controlled at 120℃-140℃, 160℃-180℃, and 180℃-200℃ respectively to melt and plasticize the XLPE. The molten XLPE is uniformly extruded onto the conductor surface through a mold to form an insulation layer, and the mold size is precisely designed according to the insulation thickness. The extruded Insulated Wire core immediately enters a cooling water tank for cooling, and the water temperature is controlled at 20℃-30℃ to quickly shape the insulation layer. After that, cross-linking treatment is carried out using a chemical cross-linking method. The insulated wire core is placed in a high-pressure steam kettle and kept at 180℃-200℃ and 1.5MPa-2.0MPa pressure for a certain time to complete the cross-linking of XLPE molecules.

After passing the inspection, the insulated wire cores enter the cabling machine. The 4 insulated wire cores are stranded into a cable according to a certain stranding direction and pitch. The cabling pitch of 4×95mm² is 200mm-250mm, and that of 4×50mm² is 150mm-200mm. During the cabling process, polypropylene ropes are filled in the center and gaps of the cable core to make the cable core round and stable. The filling material has certain elasticity and insulation, avoiding friction between wire cores. After cabling, a layer of non-woven tape is wrapped around the outer layer of the cable core to play a binding and isolating role, preparing for subsequent sheath extrusion.

The cabled core enters the sheath extruder. PVC sheath material is added to the extruder after mixing and plasticizing, and the barrel temperature is controlled at 160℃-190℃. The molten PVC is extruded onto the surface of the cable core through a mold to form a sheath layer, and the mold is precisely processed according to the cable outer diameter to ensure uniform sheath thickness. The extruded cable is cooled in a cooling water tank, and the water temperature is gradually reduced to avoid internal stress in the sheath due to sudden cooling. After cooling, the cable is pulled to the take-up machine by a tractor and neatly coiled on the cable reel. During the take-up process, the tension is controlled to prevent the cable from stretching and deforming.

The finished cable needs to undergo strict inspection, including appearance inspection to check whether the sheath surface is smooth, with no bubbles, scratches, depressions and other defects; size measurement to measure the cable outer diameter, insulation thickness, sheath thickness with a caliper to ensure they meet the specification requirements; electrical performance testing, including insulation resistance testing, voltage withstand testing (applying 1.8kV voltage for 1min without breakdown), partial discharge testing (discharge capacity ≤10pC); mechanical performance testing, including tensile strength and elongation at break tests on the sheath; flame retardant performance testing, including bunch burning test to meet the requirements of GB/T 18380.3-2002. Only products that pass all tests can leave the factory.

The cable is packaged with wooden cable reels. The cable reels are made of high-quality pine wood, and the reel diameter is determined according to the cable length. The diameter of the 500m cable reel for 4×95mm² is 1200mm, and that for 4×50mm² is 1000mm. The structure of the cable reel includes a reel shaft, baffles and spokes. The diameter of the reel shaft is 300mm-400mm, the thickness of the baffle is 25mm-30mm, and there are 8 spokes, evenly distributed to enhance stability. The outer layer of the cable is wrapped with a layer of polyethylene film to prevent dust and moisture contamination during transportation and storage. Plastic protective caps are installed at both ends of the cable to protect the end insulation and conductors from damage.

The cable is neatly coiled on the cable reel. During coiling, the tension is kept uniform to avoid loose or excessive stretching of the cable. Each circle is closely arranged without crossing or overlapping. After coiling, 50mm wide steel strips are used to fix both sides of the cable reel, with 4-6 steel strips evenly distributed on each side. The joints of the steel strips are locked with buckles to prevent the cable from slipping during transportation. Two iron lifting rings are installed on the edge of the cable reel for easy loading and unloading, with a lifting ring strength of ≥50kN. A product label is fixed on the side of the cable reel, made of waterproof and wear-resistant materials, clearly marking product information.

The product label includes: product name "Na2xy-J 4×95mm² (or 4×50mm²) 0.6/1kv XLPE Insulated Cable", model specification, length, weight, production batch number, implementation standard "GB/T 12706.1-2020", production date, manufacturer's name and address, contact information. Warning signs such as "Do not invert", "Handle with care", "Fire and moisture proof", "Avoid sun exposure" are also pasted on the cable reel, reminding operators to handle correctly with a combination of diagrams and text.

Choose an appropriate transportation method according to the transportation distance and quantity. For short-distance transportation (within 500km), road transportation is adopted, using 栏板式 trucks with a carriage length of ≥6m, which can load multiple reels of cables at the same time. The trucks are equipped with fixing devices such as steel wire ropes and tighteners. For long-distance transportation (over 500km), railway transportation can be selected, fixing the cable reels on railway boxcars or flatcars, using the stability of the railway to reduce transportation losses. For export or cross-water transportation, water transportation is adopted, loading the cable reels into containers or fixing them on cargo ships, with moisture-proof and anti-corrosion measures taken.

During transportation, the cable reel must be kept in an upright state, and it is strictly forbidden to lay it flat or upside down to avoid deformation or damage caused by the cable bearing pressure. When loading, wooden pads are placed between the cable reels to prevent mutual collision, and both sides of the carriage are fixed with baffles to limit lateral movement. When loading and unloading the cable reel, cranes or forklifts are used. When lifting, special lifting straps are used to hook the lifting rings, and direct binding of the cable reel with steel wire ropes is avoided to prevent damage to the wooden boards and cables. During transportation, sudden braking and sharp turns should be avoided, and the speed should be kept stable. In case of severe weather such as heavy rain and strong winds, the vehicle should stop to take shelter and check the fixing condition of the cable reel. For long-distance transportation, it is necessary to regularly check whether the cable reel is loose and whether the sheath is damaged, and deal with problems in a timely manner.

After the customer places an order, the sales department confirms the order information, including model specifications, quantity, delivery date, delivery location, etc., and generates a delivery notice to be transmitted to the warehouse and production department. The warehouse verifies the inventory. If there is stock, it notifies the quality inspection department to conduct outgoing inspection; if production is required, the production department arranges a production plan to ensure timely completion. The inspected qualified products are packaged by the warehouse. After packaging, the warehouse contacts the transportation company, signs a transportation contract, and clarifies the responsibilities of both parties. When the transportation company picks up the goods, the warehouse and the driver jointly check the product information and quantity and go through the handover procedures. After delivery, the sales department sends a delivery notice to the customer, including transportation method, license plate number, waybill number, estimated arrival time and other information, to facilitate the customer's receipt of goods.

For conventional specification cables in stock, delivery will be completed within 1-3 working days after receiving the customer's payment or advance payment. For customized products or large quantities of orders, the delivery time is determined according to the production cycle, usually 7-15 working days, and the specific time is communicated with the customer in advance. If there is a delay due to force majeure such as raw material shortage and equipment failure, the new delivery time will be negotiated with the customer in a timely manner, and corresponding certificates will be provided.

Customers can apply for samples through phone calls, emails, online platforms, etc., indicating the required model specifications (4×95mm² or 4×50mm²), quantity and purpose. The company will prepare the samples within 2-3 working days after receiving the application. The sample length is usually 1m-3m, which can meet the customer's needs for testing the appearance, size, material and performance. For special testing needs, longer samples or slices of specific parts can be provided.

Regular samples are provided free of charge, and the customer bears the transportation cost, which can be paid by cash on delivery or in advance. For specially customized samples (such as samples with special lengths and joints), a certain fee is charged, which is calculated according to the processing cost of the samples, usually 2-3 times the unit price of normal products. The sample fee can be deducted from the payment after the customer places an order.

Samples are packaged in hard cartons, with foam padding inside to prevent damage during transportation. They are sent by SF Express, DHL and other couriers. The fastest transportation method is selected according to the customer's location. Domestic samples usually arrive within 1-3 days, and international samples within 5-7 days. After delivery, the courier number is provided to facilitate the customer to track the logistics information. After receiving the samples, the technical personnel can provide testing guidance and parameter explanations.

The product warranty period is 2 years from the date of delivery. Within the warranty period, if the product cannot be used normally due to its own quality problems (such as insulation breakdown, sheath cracking, conductor failure, etc.), the company will provide free repair or replacement services. Customers need to provide purchase vouchers, product photos and fault descriptions, and technical personnel will determine the solution after verification.

The company is equipped with a professional technical team to provide customers with full technical support, including cable selection suggestions, laying scheme design, installation guidance, etc. Technical questions can be answered through phone calls, video conferences, etc. For large-scale projects, technical personnel can be dispatched to the site to guide the installation and assist in solving problems encountered during laying. At the same time, product technical manuals, test reports and other materials are provided to help customers better understand and use the products.

If a fault occurs during the use of the cable, the customer can contact the company's after-sales service hotline. The after-sales staff will record the fault situation in detail and respond within 2 hours. For simple faults, technical personnel can guide the customer to solve them through phone calls or video calls; for complex faults that require on-site processing, the company will dispatch technical personnel to the site within 24-48 hours (depending on the distance) to carry out fault diagnosis and maintenance. If the fault is caused by product quality problems within the warranty period, the maintenance is free of charge; if the fault is caused by improper use, man-made damage or beyond the warranty period, the company will charge reasonable maintenance fees and material fees.

The company attaches great importance to customer feedback and has established a sound customer feedback mechanism. Customers can put forward opinions and suggestions on product quality, service attitude, delivery time, etc. through the company's official website, customer service hotline, email and other channels. The company arranges special personnel to sort out and summarize customer feedback, and holds regular meetings to discuss and study improvement measures. For reasonable suggestions, the company will adopt them in a timely manner and feedback the handling results to the customer within 5 working days. The company takes customer feedback as an important basis for improving products and services, and is committed to providing customers with more satisfactory products and services.