I. Information Related to the Product Itself
(I) Specification Parameters
The specification parameters of Nyy and Nyy-J 5-core
Power Cables are based on different cross-sections, and all indicators meet the actual needs of power transmission, providing precise power support for different scenarios.
In terms of current-carrying capacity, there are obvious differences among cables with different cross-sections. The current-carrying capacity of 5X6mm² cables in a standard environment (temperature 25°C, laid in the air) is about 25-35A; that of 5X25mm² cables can reach 60-80A; and that of 5X50mm² cables can reach 100-130A. If in a high-temperature environment (such as when the workshop temperature exceeds 30°C in summer) or laid in a pipe, the current-carrying capacity will decrease, and a correction factor of 0.85-0.9 is usually required.
The outer diameter of the cable increases with the increase of the cross-section. The outer diameter of 5X6mm² cables is about 18-22mm; that of 5X25mm² cables is about 25-28mm; and that of 5X50mm² cables is about 32-35mm. Such outer diameter sizes not only ensure the reasonable arrangement of internal cores but also can adapt to laying spaces such as walls and pipes. Their rated voltage is 0.6/1kV, which meets the needs of low-voltage power transmission. At the same time, the insulation thickness meets the standards. The insulation layer thickness of 5X6mm² cables is not less than 1.0mm, that of 5X25mm² is not less than 1.2mm, and that of 5X50mm² is not less than 1.4mm, ensuring stable insulation performance.
In addition, the DC resistance of
Copper Conductors has strict standards. At 20°C, the DC resistance per kilometer of 5X6mm² cables is not greater than 3.08Ω; that of 5X25mm² is not greater than 0.727Ω; and that of 5X50mm² is not greater than 0.387Ω, which effectively controls the loss during power transmission.
Nyy and Nyy-J 5-core power cables show distinct characteristic uses in different scenarios by virtue of their own specifications and performance advantages, accurately matching various power demands.
5X6mm² cables are suitable for low-power electricity scenarios. In the office area of an office building, they can be used to connect socket clusters to supply power to equipment such as computers, printers, and water dispensers, and their current-carrying capacity can easily meet the simultaneous operation of these equipment. The power wiring of small conference rooms also often uses this specification of cables to provide stable power for projectors, audio systems, lighting systems, etc., ensuring the smooth progress of meetings. In small shops, the equipment around the cash register and the basic lighting lines use 5X6mm² cables to ensure stable power supply and avoid affecting normal operations due to insufficient power.
5X25mm² cables are suitable for power transmission of medium-sized equipment. The power of assembly line motors in the workshop is relatively large, and 5X25mm² cables can provide continuous power for them to ensure the continuous operation of the assembly line. The central air-conditioning external units in shopping malls have high requirements for power transmission. This specification of cables can meet their power needs during startup and operation, allowing the air conditioners to cool normally in hot summer. In addition, for the lines from the outlet of small transformers to distribution boxes in small factories, choosing 5X25mm² cables can reduce power loss and improve power utilization efficiency.
5X50mm² cables are mainly used for power supply of high-power equipment. The outlet of large transformers in factories needs to convert high-voltage electricity and then transmit it to various workshops. 5X50mm² cables can undertake this task to ensure efficient power transmission. The main engine of large cold storages has extremely high power and needs stable power support during operation. This specification of cables can meet its needs and ensure the low-temperature environment in the cold storage. Some large industrial pump equipment, such as large water pumps in water supply pumping stations, also rely on 5X50mm² cables for power supply to ensure the normal operation of the equipment.
The Nyy-J model has optimized stability on the basis of Nyy, and is more suitable for scenarios with high requirements for power supply reliability. For example, in the power supply lines of precision medical equipment in hospitals, even a short-term power fluctuation may affect the operation of the equipment, and
Nyy-J Cables can provide more stable power transmission; in the server rooms of data centers, the requirements for power stability and continuity are extremely high, and Nyy-J cables can reduce the risk of power outages caused by cable problems.
Nyy and Nyy-J 5-core power cables, in terms of material selection and style design, fully combine the performance requirements of power transmission and the environmental characteristics of the use scenarios, achieving the unity of practicality and reliability.
In terms of materials, the conductor is made of high-purity copper with a purity of more than 99.9%. High-purity copper has excellent conductivity, which can reduce energy loss during current transmission and improve power transmission efficiency. At the same time, copper has good ductility and
Flexibility. During cable laying, even with a certain degree of bending and dragging, it is not easy to break, reducing construction difficulty.
The insulation layer uses XLPE (cross-linked polyethylene) material, which is polyethylene after cross-linking treatment, and its performance has been significantly improved. XLPE has strong temperature resistance, with a long-term working temperature of up to 90°C. In case of short-term overload, it can withstand high temperatures of 130°C and is not easy to have insulation aging. It has high insulation resistance, which can effectively prevent current leakage and ensure electricity safety. Moreover, XLPE has good chemical stability and is not easy to be eroded by corrosive gases and moisture in the air, extending the service life of the cable.
The sheath mostly uses PVC (polyvinyl chloride) material, which has good mechanical properties. The
PVC Sheath has strong impact resistance, which can resist external collisions and 挤压 during laying and use, and protect the internal cores and insulation layer. It has excellent corrosion resistance and can maintain stable performance in humid and dusty environments, such as basements and workshops. In addition, the PVC sheath also has a certain flame retardancy, which can delay combustion when encountering an open flame, buying time for personnel evacuation and fire fighting.
In terms of style, both types of cables have a 5-core design, and the core colors are clearly distinguished. Usually, the 3 phase wires are yellow, green, and red, the neutral wire is blue, and the
Ground Wire is yellow-green, which is convenient for identification and wiring during construction. The overall shape of the cable is cylindrical with a smooth surface, and the color is mostly black, which is not only resistant to dirt but also can blend with various environments. The surface is clearly printed with marks such as model, cross-section, rated voltage, and manufacturer, which is convenient for later maintenance and traceability. The Nyy-J model may have an added shielding layer or optimized core arrangement in structure to further improve stability.
(IV) Production Process
The production process of Nyy and Nyy-J 5-core power cables is rigorous and standardized, and each link is carried out to improve product performance and quality, ensuring that the cables meet relevant standards.
The first step is the production of
Copper Conductors. High-purity copper rods are selected, and the copper rods are drawn into
Copper Wires of the required diameter through a wire drawing machine. During the wire drawing process, the wire drawing speed and die precision are strictly controlled to ensure uniform diameter of the copper wires. Subsequently, multiple copper wires are stranded to form a core. During stranding, the copper wires are arranged closely with uniform tension to enhance the mechanical strength and flexibility of the conductor, facilitating subsequent processing and laying.
Next is insulation extrusion. The XLPE material is put into an extruder to be heated and melted, and then uniformly coated on the surface of the copper conductor through a mold to form an insulation layer. During the extrusion process, the temperature (usually 120-150°C), pressure, and extrusion speed are accurately controlled to ensure that the insulation layer has a uniform thickness, a smooth surface without bubbles or impurities. After that, the insulation layer is cross-linked by chemical cross-linking. Under specific temperature and pressure, the XLPE molecules form a three-dimensional network structure to improve insulation performance.
Then comes the cabling process. The 5
Insulated Cores are stranded together in a certain stranding way. During stranding, filling materials (such as polypropylene rope) are added to make the cable shape round and reduce friction between cores. After cabling, a wrapping tape may be wrapped to enhance the structural stability of the cable and prevent the cores from loosening.
After that is sheath extrusion. The PVC material is heated and melted in an extruder and coated on the outside of the cabled core to form a sheath. During extrusion, the process parameters are well controlled to ensure uniform thickness of the sheath and close combination with the internal structure. The extruded cable is cooled and shaped in a cooling water tank to make the sheath solidify quickly.
For the Nyy-J model, a shielding layer production link may be added during the production process. A layer of metal shielding tape is wrapped outside the insulation layer to further reduce external electromagnetic interference and improve the stability of the cable. During the production process, each process is subject to quality inspection, such as insulation layer thickness inspection, voltage withstand test, and conductor resistance test. Only qualified products can enter the next process.
Finally, the cable is printed with information such as model, cross-section, and rated voltage on the surface of the sheath, and then cut and wound according to the specified length to complete the production.
II. General Product Information
(I) Packaging
The packaging of Nyy and Nyy-J 5-core power cables focuses on protecting the cables and takes into account the convenience of transportation and storage. Different packaging methods are adopted according to the cable length and specifications.
For long-length cables (usually 100 meters and above), wooden reels are used for packaging. The wooden reels are made of hard pine or fir and have strong load-bearing capacity. The cables are neatly wound on the wooden reels, and the tension is controlled during winding to avoid loose or over-stretched cables. Baffles are installed on both sides of the wooden reels, and their height is higher than the winding height of the cables to prevent the cables from slipping during transportation and handling. The outer layer of the cable is wrapped with a plastic film to prevent moisture and dust and avoid contamination and corrosion of the cable surface. The wooden reels are marked with eye-catching words and symbols such as cable model, cross-section, length, weight, manufacturer, and production date, which is convenient for identification and counting.
Short-length cables (such as 10 meters and 20 meters) are packaged in cartons. The cartons are made of high-strength corrugated paper, and foam boards or soft fillers are placed inside to fix the cables in the cartons to prevent the cables from colliding with each other due to shaking during transportation, resulting in sheath wear. The surface of the carton is printed with product-related information and warning signs such as "Handle with Care" and "Moisture-proof" to remind transporters and handlers.
During the packaging process, ensure that the packaging is firm and reliable and can withstand bumps and squeezes during transportation. At the same time, the packaging materials meet environmental protection requirements and are recyclable to reduce the impact on the environment.
(II) Transportation
The transportation of Nyy and Nyy-J 5-core power cables requires reasonable selection of transportation methods and good protective measures during transportation to ensure that the cables are safely delivered to the destination.
The transportation method is determined according to the transportation distance and quantity. For short-distance transportation (such as in the city and surrounding areas), truck transportation is adopted. Trucks have high flexibility and can directly deliver the cables to the customer's designated location, reducing handling in intermediate links. For long-distance transportation with a large number of cables, railway transportation is chosen. Railway transportation has good stability, is less affected by the weather, has a large transportation volume, and can reduce transportation costs. For exported cables, sea transportation is adopted. Sea transportation is suitable for transporting long-length and large-section cables, but the transportation time is relatively long, so the transportation schedule needs to be planned in advance.
Protective measures during transportation are crucial. When loading cables, cables packaged with wooden reels should be placed horizontally to avoid tilting or inverting to prevent the cables from slipping off the wooden reels. Fix the wooden reels on the transport vehicle with steel wire ropes or fastening belts, and select the fixed points at the special fixed positions of the wooden reels to ensure that the wooden reels do not shake or collide during transportation. The transport vehicle should drive smoothly, avoiding sudden braking and sharp turns to reduce the impact on the cables.
When transporting in rainy days, the cables must be completely covered with rainproof cloth to ensure that no rainwater seeps into the packaging to prevent the cables from getting damp. When transporting in high-temperature weather, try to avoid the cables being exposed to the sun for a long time. Transportation can be chosen in the morning or evening, or the cables can be covered with a sunshade net to prevent the sheath from aging due to high temperature.
When loading and unloading cables, use special equipment such as forklifts and cranes, and manual dragging is strictly prohibited. During loading and unloading, pay attention to protecting the cables and packaging to avoid collision and extrusion. When hoisting, the spreader should be hung on the special lifting points of the wooden reels to prevent damage to the wooden reels.
(III) Shipment
The shipment process of Nyy and Nyy-J 5-core power cables is standardized and orderly to ensure that the cables are delivered to customers in a timely and accurate manner. The specific steps are as follows:
Order confirmation: After receiving the customer's order, the sales staff shall timely check the cable model, cross-section, quantity, delivery address, delivery time and other information with the customer to ensure consistency with the customer's needs. At the same time, confirm the customer's payment status and collect the payment or advance payment in accordance with the contract agreement.
Stock preparation: Warehouse managers retrieve the corresponding cables from the inventory according to the order information and check whether the packaging of the cables is intact, the marks are clear, and the length meets the order requirements. If the inventory is insufficient, immediately notify the production department to arrange production, clarify the production progress, and ensure that the stock preparation is completed within the agreed delivery time.
Outgoing inspection: Quality inspectors conduct sampling inspection on the prepared cables. The inspection items include appearance (whether the sheath is damaged or scratched), insulation layer thickness, conductor DC resistance, voltage withstand performance, etc. Only cables that pass the inspection can be delivered, and a product quality inspection report is issued after passing the inspection.
Arranging transportation: Select an appropriate transportation method according to the delivery address, quantity and specifications of the cables, contact a reputable transporter, and sign a transportation agreement to clarify the rights and obligations of both parties. After loading the cables into the transport vehicle, inform the customer of the license plate number of the transport vehicle, the driver's contact information, the estimated arrival time and other information.
Cargo tracking: After shipment, track the transportation status of the cables in real time through the logistics information provided by the transporter. Regularly feed back the transportation progress to the customer. In case of possible delays such as traffic jams and bad weather, communicate with the customer in a timely manner, explain the reasons and adjust the delivery time.
(IV) Samples
To help customers understand the performance and quality of Nyy and Nyy-J 5-core power cables, the company provides sample services with a simple and efficient process, as follows:
Sample application: Customers can apply for samples by phone, email, online customer service, etc., stating the required cable model (Nyy or Nyy-J), cross-section (5X6mm², 5X25mm² or 5X50mm²), quantity, and receiving address, contact person, contact number and other information.
Sample preparation: The company prepares samples within 1-2 working days after receiving the sample application. The length of the sample is generally 1-2 meters, which is cut from qualified finished cables to ensure that the quality of the sample is consistent with that of mass-produced cables. The sample is marked with model, cross-section and other information, and is accompanied by a product manual, which contains the performance parameters and precautions for use of the cable.
Sample delivery: Samples are sent by express. To prevent damage to the samples during transportation, the samples are packaged with hard cartons or envelopes. Samples are provided free of charge, and the express fee is borne by the customer.
Sample tracking: After sending the samples, the express waybill number is promptly informed to the customer to facilitate the customer's query of logistics information. After receiving the samples, if the customer has any questions (such as material, performance, use method, etc.), they can contact the company at any time, and professional and technical personnel will give answers within 24 hours.
(V) After-sales Service
The company attaches great importance to the after-sales service of Nyy and Nyy-J 5-core power cables and provides customers with comprehensive support and guarantees to ensure that customers have no worries during use.
Quality assurance: The product warranty period is 1 year, calculated from the date the customer receives the goods. Within the warranty period, if the cable fails due to its own quality problems (such as insulation layer breakdown, conductor breakage, etc.), the customer can apply for after-sales service with the purchase certificate and fault photos. After receiving the application, the company will arrange technical personnel to verify the fault situation. If it is confirmed to be a quality problem, the company will replace the cable with a new one or repair it for the customer free of charge.
Technical support: The company has a professional technical team to provide customers with full-process technical support. In the cable selection stage, according to factors such as the power of the customer's electrical equipment and the laying environment, recommend appropriate cable models and cross-sections; during the laying process, provide guidance on laying methods, such as bending radius requirements and
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