Details of Yjvr, Zryjv, Vvr Copper Power Cables (16, 25, 50, 35, 70mm²)
I. Product-specific Information
(1) Specifications and Parameters
Yjvr, Zryjv, and Vvr copper
Power Cables cover various cross-sectional area specifications such as 16mm², 25mm², 35mm², 50mm², and 70mm². Each specification has clear parameter settings to meet the power transmission needs of different scenarios.
In terms of conductor parameters, the conductors of these three types of cables are all made of high-purity copper, stranded with multiple strands of
Copper Wires. The conductor of the 16mm² specification is stranded with multiple copper wires with a diameter of about 0.2mm, with a total cross-sectional area of 16mm²; the conductor copper wire of the 25mm² specification is slightly thicker, with a total cross-sectional area of 25mm²; the 35mm², 50mm², and 70mm² specifications follow the same pattern. As the cross-sectional area increases, the number or diameter of the
Stranded Copper Wires increases accordingly. The current-carrying capacity of different specifications varies significantly. At an ambient temperature of 25℃, the current-carrying capacity of the 16mm² cable is about 80A, 25mm² is about 110A, 35mm² is about 140A, 50mm² is about 185A, and 70mm² is about 230A, which can be accurately matched according to the power load.
In terms of electrical performance parameters, the rated voltage of Yjvr and Zryjv cables is 0.6/1kV, and the rated voltage of Vvr cables is also 0.6/1kV, all in line with the standards for medium and
Low Voltage Power transmission. Yjvr and Zryjv use cross-linked polyethylene (XLPE) insulation, with an insulation resistance of not less than 1000MΩ·km at 20℃ and a dielectric loss tangent value of not more than 0.003, having excellent electrical insulation performance; Vvr uses polyvinyl chloride (PVC) insulation, with an insulation resistance of not less than 500MΩ·km at 20℃, which can meet the insulation requirements of general power transmission. In addition, the partial discharge of these three types of cables is controlled at a low level to ensure the stability of power transmission.
In terms of mechanical performance parameters, the tensile strength of Yjvr and Zryjv cables is not less than 12MPa, and the elongation at break is not less than 150%, having good tensile and bending resistance. The static bending radius is not less than 12 times the outer diameter of the cable, and the dynamic bending radius is not less than 20 times the outer diameter of the cable. Due to the use of multiple strands of fine copper wire stranding, Vvr cables have better
Flexibility, with a tensile strength of not less than 10MPa, an elongation at break of not less than 180%, and a minimum bending radius of not less than 6 times the outer diameter of the cable, making them more suitable for scenarios with frequent bending.
(2) Characteristic Applications
Yjvr, Zryjv, and Vvr
Copper Power Cables have characteristic applications in different scenarios due to their respective performance characteristics.
Yjvr cables are suitable for occasions requiring bending laying due to their excellent electrical performance, temperature resistance, and flexibility. In industrial plants, the layout of equipment is complex, and cables need to 穿梭 between various machines. Yjvr cables can easily adapt to the bending path and provide power support for machine tools, production lines, and other equipment. In the shaft wiring of high-rise buildings, their good flexibility is convenient for laying in limited spaces, and the long-term working temperature of 90℃ can cope with the possible high-temperature environment in the shaft. In addition, Yjvr cables can also play a stable transmission role in projects such as bridges and tunnels that require a certain degree of bending.
As a flame-retardant cable, Zryjv is indispensable in places with high fire protection requirements. High-rise buildings are densely populated. Once a fire breaks out, the fire spreads rapidly. Zryjv cables can maintain normal operation for a certain period in the flame, buying time for personnel evacuation and fire rescue. Therefore, they are widely used in the power distribution system and emergency lighting lines of high-rise buildings. Large shopping malls and supermarkets have many electrical equipment and a high risk of fire. Zryjv cables can be used for power supply lines of lighting, air conditioning, elevators, and other equipment to reduce the risk of power system failure in case of fire. In places with dense personnel and high requirements for power reliability such as hospitals and theaters, Zryjv cables are also an ideal choice.
Vvr cables have high flexibility and convenient installation, suitable for mobile equipment connection and temporary power supply lines. On construction sites, various construction machinery such as tower cranes and concrete mixers need to move frequently. Vvr cables can move flexibly with the equipment without being easily damaged, ensuring the stability of temporary power supply. At large event venues, such as concerts and exhibitions, temporarily built power supply lines need to be installed and disassembled quickly. The flexibility and operability of Vvr cables make them the first choice. In addition, Vvr cables can also meet the needs of connecting equipment that needs to be replaced frequently, such as stage lighting equipment and mobile distribution panels.
The different specifications of these three types of cables are also widely used in industrial power distribution. The 16mm² and 25mm² specifications are often used for connecting small motors and distribution boxes; the 35mm² and 50mm² specifications are suitable for medium-sized equipment and workshop main lines; the 70mm² specification is used for larger power equipment and factory power distribution trunk lines. In building electrical engineering, these three types of cables with corresponding specifications can be found from the lines from the household distribution box to each room to the total power distribution lines of the building. Municipal engineering such as street lamp lines and underground parking lot power supply also use these cables in large quantities.
(3) Material and Style
Material
Conductor: All use high-purity oxygen-free copper with a purity of more than 99.95%. Oxygen-free copper has extremely high conductivity, which can reduce losses during power transmission and ensure efficient transmission of electrical energy. Its good ductility and flexibility make the copper wire easy to strand, and it is not easy to break when bent or stretched, ensuring the service life of the cable. At the same time, oxygen-free copper has strong corrosion resistance and can maintain stable conductivity in different environments.
Insulation layer: Yjvr and Zryjv use cross-linked polyethylene (XLPE) as the Insulation Material. After cross-linking treatment, XLPE forms a three-dimensional network structure, with excellent heat resistance. The long-term working temperature can reach 90℃, and the short-term overload temperature can reach 130℃. It has good chemical stability, resistance to acid, alkali, oil, and other corrosion, and excellent electrical insulation performance, which can effectively isolate current and prevent short circuits. The XLPE insulation of Zryjv also adds flame retardants to make it have flame-retardant properties. Vvr uses polyvinyl chloride (PVC) insulation. PVC material has low cost, certain insulation performance and mechanical strength, stable performance at room temperature, and is suitable for general environment use.
Sheath: All three types of cables use polyvinyl chloride (PVC) as the sheath material. The PVC Sheath has a good mechanical protection effect, can resist external mechanical impact, wear, and extrusion, and has certain weather resistance and corrosion resistance, protecting the internal insulation layer and conductor from damage. The sheath of Zryjv also adds flame-retardant components to enhance the overall flame-retardant effect.
Style
These three types of cables all have a
Multi-Core cabling structure, which can be divided into single-core, three-core, four-core, five-core, and other styles according to actual needs. Single-
Core Cables are mainly used for high-voltage lines, while three-core, four-core, and five-core cables are suitable for low-voltage three-phase four-wire or five-wire power distribution systems. The appearance of the cable is round, and the outer diameter of different specifications is different. The outer diameter of 16mm² cable is about 15mm, 25mm² is about 18mm, 35mm² is about 22mm, 50mm² is about 26mm, and 70mm² is about 30mm.
The sheath has various colors, commonly black, gray, etc. The black sheath has good ultraviolet resistance and is suitable for outdoor laying; the gray sheath is often used indoors. The structure of Yjvr and Zryjv cables is relatively compact. Because the conductor of Vvr cable is stranded with more fine copper wires, it is more flexible overall and looks slightly fluffy.
(4) Production Process
The production processes of Yjvr, Zryjv, and Vvr copper power cables have similarities and differences due to different performance requirements.
In terms of conductor manufacturing, the processes of the three types of cables are the same. High-purity oxygen-free copper rods are drawn into copper wires of the required diameter through a wire drawing machine, and then the copper wires are annealed to eliminate internal stress and enhance flexibility. After that, according to the cross-sectional area requirements of different specifications, multiple copper wires are stranded according to certain stranding rules to form a conductor. During the stranding process, the stranding pitch is strictly controlled to ensure the roundness and stability of the conductor.
In the insulation layer extrusion link, Yjvr and Zryjv adopt the same process. XLPE particles are added to the extruder, heated to a molten state (temperature about 120-180℃), and uniformly extruded and coated on the surface of the conductor through a mold to form an insulation layer. For Zryjv cables, flame retardants are added to the XLPE material in advance to achieve flame-retardant effect. After extrusion, the insulation layer is cross-linked, usually by dry cross-linking, so that the XLPE molecules form a three-dimensional network structure to improve the insulation performance. For Vvr cables, PVC particles are heated and melted and then extruded and coated on the surface of the conductor to form an insulation layer. The extrusion temperature is about 150-170℃, and no cross-linking treatment is required.
In the cabling process, multiple core wires with insulation layers are cabled according to a certain stranding direction and pitch. For cables with three or more cores, suitable filling materials are filled between the core wires to make the cable round. After cabling, a layer of wrapping tape is wrapped to enhance the structural stability of the cable.
In the sheath extrusion link, all three types of cables use PVC materials. PVC particles are heated and melted, and then extruded and coated on the outside of the cabled core through an extruder to form a sheath. For Zryjv cables, flame retardants are also added to the PVC material to match the flame-retardant performance of the insulation layer. During the extrusion process, the temperature, speed, and pressure are controlled to ensure that the sheath has a uniform thickness, a smooth surface, and is closely combined with the internal structure.
During the production process, each process undergoes strict quality inspection, including the detection of conductor diameter, insulation layer thickness, sheath thickness, electrical performance, mechanical performance, and other indicators to ensure that the products meet relevant standards.
II. General Product Information
(1) Packaging
To ensure the quality of Yjvr, Zryjv, and Vvr copper power cables during transportation and storage, the packaging method is carefully designed.
For long-length cables, they are usually wound on steel cable reels. The diameter of the cable reel is determined according to the cable specification and length. Cables of 16mm² and 25mm² can use cable reels with a diameter of 1000mm, while those of 35mm², 50mm², and 70mm² use cable reels with a diameter of 1200-1600mm. Both sides of the cable reel are equipped with solid baffles with a thickness of not less than 20mm to prevent the cable from slipping during transportation. The center of the cable reel is provided with a shaft hole for easy hoisting and handling.
After the cable is wound on the cable reel, the outer layer is wrapped with a layer of plastic film to play the role of moisture-proof, dust-proof, and oil-proof. Each reel of cable is clearly marked with product name, specification model, length, weight, production date, implementation standard, manufacturer, and other information on the side of the cable reel, which is convenient for customers to identify and count. The packaging is also printed with warning signs such as "Do not invert", "Handle with care", "Moisture-proof and sun-proof" to remind relevant personnel to pay attention to protection.
For short-length cables, they are packaged in rolls, tightly wrapped with plastic film and then put into cartons. The cartons have high strength, which can effectively prevent the cables from being damaged by pressure, and the necessary product information is also marked on the outside of the cartons.
(2) Transportation
Transportation methods: Select appropriate transportation methods according to the transportation distance and order quantity. For short-distance transportation, road transportation is generally used, and trucks are used to load cable reels. The trucks need to be equipped with fixing devices to firmly fix the cable reels to prevent shaking during transportation. For long-distance transportation, railway transportation can be selected, which has good stability and is suitable for transporting large quantities of cables; for areas with ports, waterway transportation can also be used, with relatively low cost.
Transportation precautions: During transportation, the cable reel must be placed horizontally, and it is strictly forbidden to tilt or invert to prevent the cable from slipping off the cable reel. A certain distance should be kept between cable reels to prevent mutual collision and extrusion, which may cause damage to the sheath and internal structure. Transport vehicles or tools should take rain-proof, sun-proof, and dust-proof measures, such as covering with rain-proof cloth, to avoid the cable being damped, polluted, or exposed to direct sunlight. When loading and unloading the cable reel, special hoisting equipment must be used, and the hoisting point should be selected at the lifting ring of the cable reel. Hoisting at the baffle or other parts is strictly prohibited to avoid damaging the cable reel and the cable. During transportation, traffic rules must be observed, driving should be smooth, and operations such as sudden braking and sharp turns should be avoided to reduce the impact on the cable.
(3) Delivery
Delivery time: After the customer confirms the order and makes payment, we will arrange delivery as soon as possible. For specifications in stock, they can be shipped within 1-3 working days; for customized specifications or large quantities of orders, the production cycle will be extended according to the actual situation. We will communicate with the customer in advance to clarify the delivery time to ensure that the customer can reasonably arrange subsequent work.
Delivery process: Warehouse personnel accurately pick cables of corresponding specifications and lengths according to the order information and conduct strict checks to ensure that the product information is consistent with the order. Conduct appearance and performance sampling inspection on the cable, and after confirming that there is no quality problem, package it according to the packaging standards. Contact the cooperative logistics company, arrange transport vehicles, safely load and fix the cable firmly. After delivery, timely inform the customer of the logistics information (logistics company name, waybill number, contact information, etc.) via SMS, email, etc., to facilitate the customer to track the transportation status of the goods. At the same time, maintain close communication with the logistics company to keep abreast of the transportation situation of the goods and ensure timely and safe delivery.
(4) Samples
To allow customers to fully understand the product quality and performance before mass purchase, we provide sample services.
Customers can apply for samples through telephone, email, or online customer service, stating the model, specification, quantity, and other information of the required cable. We will prepare the samples within 1-3 working days after receiving the application. The length of the samples is generally 1-2 meters, which can meet the customer's testing needs for the product's appearance, structure, and basic performance.
The quality of the samples is consistent with that of mass-produced products, and they strictly follow the same production process and quality standards. In terms of sample fees, ordinary customers need to pay a certain sample fee and freight, and the sample fee can be deducted during subsequent mass purchases; for long-term cooperative old customers or large customers with clear intention of mass purchase, free samples can be provided, and the freight is borne by the customer or negotiated by both parties.
After the sample is sent, the customer will be informed of the express information in a timely manner. After the customer receives the sample, if there are any questions, our technical personnel will provide professional answers and technical support.
(5) After-sales Service
We have a complete after-sales service system to provide customers with comprehensive after-sales guarantee.
Quality assurance: Yjvr, Zryjv, and Vvr copper power cables provide a 15-year warranty period. During the warranty period, if the cable cannot be used normally due to its own quality problems (such as conductor breakage, insulation layer damage, sheath cracking, etc.), we will replace the new cable for the customer free of charge. For damage caused by non-product quality reasons such as improper installation and wrong use by the customer, repair services are provided, and corresponding repair fees and material fees are charged.
Technical support: Customers can contact our technical personnel at any time if they encounter any technical problems during installation, laying, use, and maintenance. Technical personnel provide professional guidance through telephone, email, video, etc., such as installation methods, fault diagnosis, daily maintenance, etc. When necessary, technical personnel can be dispatched to provide on-site support.
Complaint handling: If customers are dissatisfied with products or services, they can complain through customer service hotlines, emails, and other channels We will record the details of the complaint in a timely manner and assign a dedicated person to follow up. The handler will communicate with the customer to understand the specific situation in detail, conduct an in-depth investigation and analysis, and put forward a solution within 7 working days. We will keep the customer informed of the progress of the complaint handling in a timely manner and adjust the solution according to the customer's feedback until the customer is satisfied.
Regular return visits: We will conduct regular return visits to customers who have purchased our products. The return visit cycle is usually once every 3 months in the first year after purchase, and once every 6 months in the following years. During the return visit, we will understand the use status of the cables, including whether there are problems such as heating, insulation aging, and sheath damage, and collect customers' opinions and suggestions on product quality, performance, and service. For the problems reflected by customers, we will arrange professional personnel to solve them in a timely manner. At the same time, we will sort out and summarize the return visit information, and use it as an important basis for improving product quality and service level, so as to continuously enhance customer satisfaction and loyalty.
In summary, Yjvr, Zryjv, and Vvr copper power cables (16, 25, 50, 35, 70mm²) have become ideal choices in the field of medium and low voltage power transmission with their excellent specifications and parameters, extensive characteristic applications, high-quality materials and styles, advanced production processes, as well as perfect packaging, transportation, delivery, sample, and after-sales services. They can provide safe, stable, and efficient power transmission support for various power systems in industrial production, building construction, municipal engineering, and other fields, contributing to the smooth operation of various industries.