Fr-PVC building wire is a high-performance cable specially designed for building electrical systems, with a rated voltage of 450/750V. It includes two types: BV (single-core hard conductor) and Bvr (multi-core soft conductor), both using high-purity copper as conductors, coated with flame-retardant polyvinyl chloride (Fr-PVC) insulation material, reaching Class C flame retardant level. It is widely used in lighting, power distribution, and weak current system wiring of various buildings.​ The conductor part is made of electrolytic copper with a purity of over 99.95%, ensuring excellent electrical conductivity. The BV type adopts a single solid copper conductor, which has a hard structure and is not easy to deform during laying, suitable for fixed wiring scenarios such as wall embedding and pipe threading; the Bvr type is stranded by multiple fine copper wires, with excellent flexibility, which can be bent flexibly, suitable for wiring environments that require frequent movement or many turns, such as lamp installation and equipment connection. Both types of conductors are annealed to reduce resistance loss, reduce energy waste during long-term use, and ensure efficient power transmission.​ The insulation layer is made of polyvinyl chloride material with flame retardants (Fr-PVC), with uniform thickness in line with national standards. Depending on the wire diameter, the insulation thickness ranges from 0.6mm to 1.4mm. This material not only has good insulation performance and can effectively block current leakage, but also has passed strict flame retardant tests, reaching Class C flame retardant standards - after burning with an open flame for 30 seconds, when the fire source is removed, the flame can self-extinguish within 60 seconds without generating drips to ignite combustibles below, greatly reducing the risk of fire spread in building fires. At the same time, Fr-PVC has a temperature resistance range of -15℃ to 70℃, which can adapt to temperature changes in different areas inside the building, with excellent anti-aging performance and a service life of more than 20 years.​ The product has a wide range of wire diameter specifications, from 0.5mm² to 25mm², meeting the power demand of different power equipment: 0.5-2.5mm² is suitable for low-power equipment such as lighting fixtures and switch sockets; 4-10mm² can be used for household appliances such as air conditioners and refrigerators; 16-25mm² is suitable for high-power electrical appliances such as electric water heaters and central air conditioners. All specifications comply with domestic and foreign standards such as GB/T 5023.3 and IEC 60227, and have passed multiple index tests such as voltage withstand test (2000V/5min without breakdown), insulation resistance test, and mechanical performance test to ensure safe use.​ In building scenarios, the application of this cable is highly targeted: in residential projects, BV type is often used for main lines concealed installation in walls, and Bvr type is used for branch lines of lamps and switches; in commercial buildings such as shopping malls and office buildings, the two types can be flexibly matched, taking into account the stability of fixed wiring and the flexibility of equipment connection; in places with high safety requirements such as hospitals and schools, Class C flame retardant performance can gain valuable time for personnel evacuation and fire control. In addition, the cable has various colors, including yellow-green special for grounding, red, blue, yellow, etc., which is convenient for distinguishing phase lines, neutral lines, and ground lines, reducing the risk of construction misoperation.​ In the production process, automation control is realized from copper smelting to insulation extrusion: conductor drawing uses precision molds to ensure wire diameter accuracy, insulation extrusion uses online thickness measurement system to monitor thickness in real time, and finished products are inspected for insulation integrity by high-voltage spark testing machine meter by meter. Each batch of products is accompanied by a quality guarantee, which can trace production information, making users more assured.​ To sum up, with high-purity copper conductors, Class C flame-retardant insulation, flexible model selection, and strict quality control, Fr-PVC building wire has become an ideal choice for building electrical wiring. It can not only meet the stable transmission needs of daily electricity use, but also improve the safety protection level of buildings in emergencies such as fires, providing reliable guarantee for building electrical systems.