Fr-PVC Building Wire 450/750V BV/Bvr Copper Cable Flame Retardant Class C

Rated Voltage: The rated voltage of this Fr-PVC building wire is 450/750V, where 450V is the voltage between conductors, and 750V is the voltage between the conductor and the ground. This voltage level fully complies with the electricity standards for low-voltage equipment in building electrical systems, and can provide stable and safe power transmission guarantee for lighting, power distribution, and weak current systems in various buildings, meeting the basic electricity needs of most civil and industrial buildings.

Conductor Type and Structure: It includes two types: BV (single-core hard conductor) and Bvr (Multi-Core soft conductor). The BV type adopts a single solid Copper Conductor, and its diameter varies according to the wire gauge. For example, the conductor diameter of 0.5mm² BV Wire is about 0.8mm, and that of 2.5mm² BV wire is about 1.78mm. This single solid structure makes the BV wire hard, not easy to deform during laying, and has good tensile performance. The Bvr type is stranded by multiple fine Copper Wires. Taking 2.5mm² Bvr wire as an example, it is usually stranded by 19 fine copper wires with a diameter of about 0.41mm. The multi-strand stranded structure endows the Bvr wire with excellent Flexibility, which can be easily bent into various angles and adapt to complex wiring environments.

Wire Gauge Specifications: The product has a wide range of wire gauge specifications, covering multiple grades from 0.5mm² to 25mm². 0.5mm² wires are usually used for internal connection of small electronic devices or indicator light circuits; 1mm² and 1.5mm² wires are suitable for low-power electrical equipment such as household lighting fixtures and small switch sockets; 2.5mm² wires can meet the electricity needs of general household appliances such as TV sets, washing machines, and electric fans; 4mm² wires are often used for appliances with slightly higher power such as air conditioners and electric water heaters; wires with 6mm² and above specifications are suitable for power supply lines of high-power appliances such as central air conditioners and large commercial equipment.

Insulation Layer Parameters: The insulation layer is made of flame-retardant polyvinyl chloride (Fr-PVC) material, and its thickness varies from 0.6mm to 1.4mm according to the wire gauge. For example, the insulation layer thickness of 0.5mm² wire is about 0.6mm, that of 2.5mm² wire is about 0.8mm, and that of 10mm² wire reaches 1.2mm. The insulation layer has excellent insulation performance, with a volume resistivity of not less than 1×10¹⁴Ω·cm, which can effectively block current leakage and ensure electrical safety. At the same time, the insulation layer has passed strict voltage withstand tests, with no breakdown phenomenon when subjected to 2000V AC voltage for 5 minutes.

Flame Retardant Grade: The flame retardant grade reaches Class C, which is a more important safety indicator in Building wires. According to relevant standards, Class C Flame Retardant Wires, after being burned by an open flame for 30 seconds and then the fire source is removed, the flame can self-extinguish within 60 seconds, and no drips will be generated during combustion to ignite the combustibles below. This feature can effectively delay the spread of fire along the wires in case of a building fire, gaining valuable time for personnel evacuation and fire fighting.

Temperature Resistance Range: The temperature resistance range of Fr-PVC Insulation Material is -15℃ to 70℃. Within this temperature range, the wire can maintain stable performance without insulation layer cracking or accelerated aging due to temperature changes. Whether in cold winter or hot summer, it can adapt to the temperature environment of different areas inside the building, ensuring the stability of power transmission.

Mechanical Properties: The wire has good mechanical properties, with a tensile strength of not less than 12MPa and an elongation at break of not less than 150%. This enables the wire to withstand certain tensile and bending stresses during laying and installation, and is not prone to conductor breakage or insulation layer damage. At the same time, the wire has excellent wear resistance, which can resist friction and collision in daily use.

Standard Compliance: All specifications of Fr-PVC building wires comply with relevant domestic and foreign standards such as GB/T 5023.3 and IEC 60227. These standards make strict regulations on the Conductor Material, insulation performance, flame retardant performance, mechanical properties of the wire, ensuring the quality and safety of the product, and also enabling the wire to be widely used in various domestic and foreign construction projects.

Residential Buildings: In residential projects, BV wires are often used for main lines concealed in walls, such as main power supply lines in living rooms, bedrooms, kitchens and other areas. Due to its hard texture and stable structure, it is not easily affected by external factors when buried in walls or pipes, and can maintain good performance for a long time. Bvr wires are mostly used for branch lines such as lamp installation and switch connection. Their flexibility makes wiring in narrow spaces such as ceilings and wall gaps very convenient, and can easily cope with various turning and bending needs. For example, when installing a chandelier, Bvr wires can flexibly pass through the connection between the lamp holder and the ceiling to ensure the normal power supply of the lamp.

Commercial Buildings: The electrical systems of commercial buildings such as shopping malls and office buildings are relatively complex, requiring high performance and flexibility of wires. BV and Bvr wires can be flexibly used in combination, taking into account the stability of fixed wiring and the flexibility of equipment connection. In fixed wiring scenarios such as large shelf lighting and central air conditioning power supply in shopping malls, BV wires can provide stable and reliable power transmission; while in the connection lines of office equipment such as computers and printers in office areas, the flexibility of Bvr wires facilitates the movement of equipment and the arrangement of lines, reducing the trouble caused by line entanglement.

Public Buildings: Public buildings such as hospitals, schools, and libraries have extremely high safety requirements, and the Class C flame retardant performance of Fr-PVC building wires plays an important role here. In hospitals, the power supply lines of various medical equipment need to be highly safe and reliable. The stable performance of BV wires ensures the normal operation of the equipment, while Bvr wires facilitate the movement and maintenance of the equipment. In school classrooms, laboratories and other places, the flame retardant performance of wires is particularly important. In case of fire, the Class C flame retardant feature can effectively prevent the spread of fire along the wires, gaining time for the evacuation of teachers and students.

Industrial Buildings: In auxiliary areas of some industrial plants, such as offices, rest rooms, and warehouses, this Fr-PVC building wire is also often used. For low-power lighting equipment, ventilation fans, etc., wires with 2.5mm² and below can be selected; for temporary power supply lines of some small electric tools, the flexibility of Bvr wires allows them to be easily dragged and moved to meet temporary electricity needs.

Weak Current Systems: In addition to power distribution and lighting systems, the wire is also suitable for wiring of building weak current systems, such as auxiliary power supply lines of telephone lines and network lines, and shielding layer grounding of cable TV signal transmission lines. Due to its good insulation performance, it can effectively reduce electromagnetic interference and ensure stable transmission of weak current signals.

Conductor Material: The conductor is made of electrolytic copper with a purity of more than 99.95%. This high-purity electrolytic copper has extremely high conductivity, which can effectively reduce resistance loss during current transmission and improve power transmission efficiency. Compared with ordinary copper materials, electrolytic copper has extremely low impurity content, which greatly reduces the degradation of conductivity and heating caused by impurities. At the same time, electrolytic copper has good ductility and plasticity, which is convenient for wire drawing, stranding and other processing techniques, ensuring the quality and performance stability of the conductor.

Insulation Layer Material: The insulation layer is made of polyvinyl chloride (Fr-PVC) material with flame retardants added. Polyvinyl chloride itself has good insulation performance and chemical stability. By adding specific flame retardants, it has excellent flame retardant performance. This Fr-PVC material can not only effectively block current, but also inhibit combustion reactions and reduce smoke generation when encountering an open flame. Compared with other insulation materials, Fr-PVC material has relatively low cost and mature processing technology, which is suitable for mass production. In addition, this material also has certain chemical corrosion resistance, which can resist the erosion of some common chemical substances and prolong the service life of the wire.

Color Style: The wires have various colors, which are convenient for distinguishing different line functions. Among them, yellow-green is the special color for grounding. According to electrical specifications, the grounding line must use yellow-Green Wires, so that the grounding line can be quickly identified during construction and maintenance to avoid misoperation. Red, yellow, and green are usually used as phase lines, while blue and black are mostly used as neutral lines. Wires of different colors can clearly distinguish phase lines, neutral lines, and ground lines during wiring, making the line layout of the electrical system more standardized and orderly, and also facilitating later maintenance and repair. For example, in the distribution box of a residence, the function of each line can be quickly judged through wires of different colors, improving maintenance efficiency.

Copper Smelting and Casting: First, electrolytic copper raw materials with a purity of more than 99.95% are put into a smelting furnace for smelting. During the smelting process, the temperature and time are strictly controlled to ensure that the copper material is completely melted and impurities are fully separated. The molten copper after smelting is subjected to purification treatments such as degassing and slag removal, and then cast into copper billets. The quality of the copper billet directly affects the performance of the subsequent conductor, so during the casting process, it is necessary to ensure that the structure of the copper billet is uniform, without pores, cracks and other defects.

Conductor Drawing: According to different wire gauge specifications, the copper billet is drawn into copper wires of the required diameter through a wire drawing machine. The wire drawing machine uses precision molds to draw the copper billet into copper wires of the required diameter through step-by-step stretching. During the drawing process, it is necessary to strictly control the drawing speed, tension and lubrication conditions to ensure that the diameter of the copper wire is uniform and the surface is smooth. For the single solid conductor of BV wire, it can be directly drawn into a copper wire of the corresponding diameter; for the multi-strand Stranded Conductor of Bvr wire, the copper wire needs to be drawn into a thinner specification to prepare for the subsequent stranding.

Conductor Annealing: The drawn copper wire has high hardness and needs to be annealed. The copper wire is put into an annealing furnace and heated under a certain temperature and protective atmosphere, so that the internal structure of the copper wire changes, reducing hardness and improving flexibility and conductivity. The annealing temperature and time are precisely controlled according to the diameter and material of the copper wire to ensure the annealing effect. The copper wire after annealing treatment has significantly improved conductivity and mechanical properties, and is more suitable for use as wire conductors.

Conductor Stranding (for Bvr Type): For Bvr wires, multiple strands of annealed fine copper wires are stranded according to a certain stranding direction and pitch. The stranding process is carried out on special stranding equipment, which can precisely control the stranding pitch and tension to ensure that each strand of copper wire is evenly stressed and tightly stranded. The stranded conductor not only has greatly enhanced flexibility, but also its conductive cross-sectional area remains stable, which can meet the requirements of power transmission.

Insulation Layer Extrusion: The Fr-PVC Insulation Material is put into the extruder, heated and melted, and then evenly coated on the surface of the conductor through a mold to form an insulation layer. During the extrusion process, it is necessary to strictly control the extrusion temperature, pressure and speed to ensure that the insulation layer has a uniform thickness, a smooth surface, and is closely combined with the conductor. The online thickness measurement system monitors the thickness of the insulation layer in real time to ensure that it meets the design requirements. For wires of different wire gauge specifications, corresponding molds need to be replaced to ensure the matching between the insulation layer and the conductor.

Cooling and Solidification: The wire with the extruded insulation layer enters the cooling water tank for cooling and solidification. During the cooling process, water is evenly sprayed on the surface of the wire to make the Fr-PVC material cool and shape quickly, ensuring the dimensional stability and mechanical properties of the insulation layer. The cooling water temperature needs to be strictly controlled to avoid cracks or internal stress in the insulation layer due to excessive cooling speed.

Spark Test: The cooled wire is tested meter by meter through a high-voltage spark tester to check the integrity of the insulation layer. The tester applies a certain high voltage on the surface of the wire. If there are pinholes, cracks and other defects in the insulation layer, spark discharge will occur. The equipment will immediately alarm and mark the defect location for subsequent processing. This link ensures the quality of the wire insulation layer and effectively prevents electric leakage accidents caused by insulation defects.

Printing Identification: On the surface of the wire's insulation layer, product information is printed by a printing machine, including product name, specification model, rated voltage, production batch number, execution standard, manufacturer, etc. The printing should be clear and firm, not easy to fall off, so that users can identify and trace product information.

Take-up and Packaging: Qualified wires are taken up according to the specified length, usually using reels or coiled packaging. During the take-up process, the take-up tension should be controlled to avoid excessive stretching or twisting of the wire. During packaging, necessary protection is provided for the wire, such as wrapping with plastic film, to prevent the wire from being polluted and damaged during storage and transportation.

Packaging Methods: There are mainly two packaging methods for Fr-PVC building wires: reel packaging and coiled packaging. For wires with larger wire diameters (such as 10mm² and above) or longer lengths (such as 100 meters, 200 meters), reel packaging is usually adopted. The reel is made of high-strength wood or steel, which has good bearing capacity and can ensure that the wire is not damaged during winding. The size of the reel is designed according to the wire diameter and length of the wire, and the general diameter is between 30cm and 100cm. For wires with smaller wire diameters (such as 6mm² and below) and relatively short lengths (such as 50 meters, 100 meters), coiled packaging is mostly used, in which the wires are neatly wound into a disc shape and packaged with plastic film or cartons.

Packaging Materials: In reel packaging, the wood for the reel is selected from hard and not easily deformable pine or fir, which is processed after drying to prevent the reel from being damp and deformed during storage and transportation. The steel reel is made of high-quality low-carbon steel, which has high strength and corrosion resistance after welding, spraying and other processes. In coiled packaging, the plastic film is made of polyethylene material, which has good moisture-proof and dust-proof performance and can effectively protect the wire from the external environment. The carton is made of corrugated cardboard, which is tough and has a certain compressive strength, which can better protect the wire.

Packaging Marking: Both reel packaging and coiled packaging have clear product marks printed on the packaging surface. The marking content includes product name (Fr-PVC building wire), specification model (such as BV-450/750V-2.5mm², Bvr-450/750V-4mm²), rated voltage, length, flame retardant grade (Class C), execution standard, production batch number, production date, shelf life, manufacturer's name, address, contact information, etc. These marks not only facilitate users to quickly understand the basic situation of the product, but also are conducive to product quality traceability and after-sales service.

Packaging Protection: In order to further protect the wire, some protective measures are taken during the packaging process. For reel-packaged wires, a layer of soft material, such as cotton cloth or foam, is placed between the wire and the reel to prevent the insulation layer from being damaged due to direct friction between the wire and the reel. Coiled wires maintain appropriate tension during winding to avoid loosening or excessive stretching of the wire. In addition, all packages must be well sealed to prevent moisture, dust, etc. from entering the package and polluting the wire.

Transportation Methods: Different transportation methods can be selected according to the transportation distance, order quantity and customer needs. For short-distance (such as within 100 kilometers) and small-batch transportation, road transportation is usually adopted, using trucks to directly deliver the wires to the customer's designated location. This transportation method is flexible and convenient, and can quickly respond to customer needs. For medium and long-distance (such as 100 kilometers to 1000 kilometers) and medium-batch transportation, road transportation is also the main method, and large freight vehicles can be selected for transportation to improve transportation efficiency. For long-distance (such as more than 1000 kilometers) and large-batch transportation, railway transportation is an ideal choice. Railway transportation has the advantages of large carrying capacity, good stability and relatively low cost, and is suitable for large-scale cargo transportation. For exported products, sea or air transportation is adopted. Sea transportation is suitable for large quantities of goods that do not require high transportation time, while air transportation is suitable for small quantities of goods with urgent needs.

Transportation Precautions: During transportation, the wire should be protected from severe collision, extrusion, exposure to the sun and rain. When loading wires, reels or coiled wires should be placed neatly with a certain gap between them to avoid mutual extrusion and deformation. For reel-packaged wires, the reels should be firmly fixed on the transport vehicle with ropes or fixing devices to prevent the reels from rolling or shifting during transportation

Transportation Time: The transportation time varies according to the transportation method and distance. Road transportation can usually be delivered within 1-2 days for short distances (within 100 kilometers); medium and long-distance (100-1000 kilometers) road transportation generally takes 3-5 days; railway transportation takes a relatively long time, and long-distance transportation (more than 1000 kilometers) usually takes 5-10 days; sea transportation takes even longer, which may take 15-30 days or more depending on the destination; air transportation is the fastest, with domestic transportation generally taking 1-2 days and international transportation taking 3-7 days. Before shipment, the manufacturer will estimate the transportation time to the customer according to the transportation method and distance, so that the customer can prepare for receipt.

Delivery Time: For in-stock Fr-PVC building wires, the manufacturer will arrange delivery within 24-48 hours after the customer places an order. If the wire specifications required by the customer are special or the quantity is large, production scheduling is required, and the delivery time will be determined according to the production cycle. Generally speaking, the production cycle of wires with conventional specifications is 3-5 days, and the production cycle of wires with special specifications may be extended to 7-10 days. After the order is confirmed, the manufacturer will timely communicate the production progress and estimated delivery time with the customer to ensure that the customer is informed of the delivery status of the product.

Delivery Process: After the customer places an order, the sales staff will enter the order information into the company's ERP system, which automatically transmits the order information to the warehouse and production department. The warehouse department first reviews the order to confirm whether there is stock. If there is stock, the warehouse manager will prepare the goods according to the order requirements, check the specifications, models, quantities and other information of the wires to ensure they are consistent with the order. After the goods are prepared, an outgoing inspection is carried out to check whether the packaging of the wires is intact, the marks are clear, and the products are in good condition. After passing the inspection, arrange transport vehicles for loading and go through relevant transportation procedures such as waybills and insurance policies. At the same time, a logistics tracking number is generated and fed back to the customer in a timely manner by the sales staff to facilitate the customer to check the transportation status of the goods.

Delivery Notification: After the goods are shipped, the manufacturer will send a delivery notification to the customer via SMS, email or phone call, which includes information such as the logistics tracking number, transportation method, estimated arrival time, and contact information of the carrier. This allows the customer to prepare for receipt in advance, such as arranging personnel to receive the goods and preparing a storage site, to ensure that the goods can be delivered and signed for smoothly.

Sample Provision: To enable customers to fully understand the quality and performance of the product before mass purchase, the manufacturer can provide free samples. The length of the sample is usually 1-5 meters, which can meet the customer's testing needs for the appearance, size, flexibility, insulation layer thickness, etc. of the wire. Customers only need to bear the transportation cost of the samples. For long-term cooperative customers or potential customers with large orders, the manufacturer can also bear the transportation cost of the samples.

Sample Application Process: Customers can apply for samples from the manufacturer by phone, email, online customer service, etc., stating the specifications, quantity, purpose and other information of the required samples. After receiving the application, the manufacturer will review the application within 2-3 working days, and arrange the preparation and delivery of samples after approval. After sending the samples, the express tracking number of the samples will be informed to the customer to facilitate the customer to check the transportation status of the samples.

Sample Feedback: After receiving the samples, customers can conduct various performance tests and evaluations on the samples. If satisfied with the samples, they can further negotiate with the manufacturer on mass purchase matters, and the manufacturer will provide detailed quotations and supply plans according to the customer's needs. If the customer has any questions or suggestions about the samples, the manufacturer will arrange professional technical personnel to communicate with the customer, answer the customer's questions, and make improvements and optimizations according to the customer's feedback to meet the customer's needs.

Quality Assurance: The manufacturer promises that the produced Fr-PVC building wires meet relevant industry standards and international standards, with a product warranty period of 20 years. Within the warranty period, if the wire fails to function normally due to its own quality problems (such as conductor breakage, insulation layer damage, substandard flame retardant performance, etc.), the manufacturer will provide free repair or replacement services. For faults caused by non-product quality issues, such as man-made damage, improper installation or use beyond the rated parameters, the manufacturer can also provide repair services but will charge corresponding cost fees.

After-Sales Service Process: If customers encounter any problems during use, they can call the manufacturer's after-sales service hotline or contact the after-sales service department via email, online customer service, etc. at any time. After-sales service personnel will respond to customers' needs within 24 hours and understand the specific situation of the problem. For simple problems, they will provide customers with technical guidance and solutions via phone or email; for complex problems that require on-site maintenance, the manufacturer will arrange professional technical personnel to arrive at the site for handling within 48 hours (except for remote areas) to ensure that the problem is solved in a timely manner.

Customer Feedback Handling: The manufacturer attaches great importance to customers' feedback and has established special customer feedback channels and handling mechanisms. Customers can put forward their opinions and suggestions through the after-sales service hotline, email, online messages, etc. The manufacturer will classify, sort out, analyze and study customers' feedback. For reasonable opinions and suggestions, they will be promptly adopted and applied to product production and services to continuously improve product quality and service levels. At the same time, the manufacturer will conduct regular return visits to customers to understand the use of products and customer satisfaction, and establish long-term and stable cooperative relationships.