The standard BVV cable with 3 cores, 1.5mm² solid copper wires, including red, blue and tinned wires, is a high-quality cable specially designed for in-wall conduit electrical wiring. It occupies an important position in the field of indoor electrical installation by virtue of its excellent performance.​ In terms of conductors, each core of the cable is made of solid high-purity copper wire with a purity of over 99.95%, which endows the cable with excellent conductivity. High-purity copper can effectively reduce the resistance during current transmission, reduce energy loss, and ensure efficient and stable transmission of electricity in in-wall conduit wiring. The solid structure gives the conductor high mechanical strength, which is not easy to break during pipe threading and wiring, and can withstand a certain amount of tension and pressure, adapting to the complex laying environment of in-wall conduits. Among them, the tinned wire not only has good conductivity but also has stronger oxidation resistance and corrosion resistance, which can effectively resist the erosion of possible moisture, dust and other factors in the wall, and prolong the service life of the cable.​ The insulation layer and sheath are made of high-quality polyvinyl chloride (PVC) material, forming a double-layer protection structure. The inner insulation is individually wrapped for each core wire with a uniform thickness and excellent insulation performance, which can effectively isolate the electrical interference between each core wire and prevent short-circuit accidents. The outer sheath tightly wraps the three core wires together, with tough texture and high tensile strength, which can withstand various external impacts during installation and use. At the same time, it has good moisture-proof and corrosion-resistant performance, protecting the internal core wires from water vapor, acid and alkali substances in the wall. The red and blue core wires are convenient for distinguishing the live wire and neutral wire, and the tinned wire is usually used as the ground wire. The clear color identification can reduce wiring errors in construction and improve installation efficiency and safety.​ In terms of applicable scenarios, this cable is very suitable for in-wall conduit electrical wiring. In residential buildings, it can be used for wiring of lighting lines and socket lines in living rooms, bedrooms, kitchens, bathrooms and other areas. For example, the power supply lines of chandeliers, wall lamps and other lighting equipment in the living room, as well as the socket lines near sofas and TV walls, can all use this cable. Its 1.5mm² cross-sectional area can meet the power requirements of ordinary household appliances. In commercial places, such as offices and small shops, the cable can be used for in-wall wiring of office equipment and lighting systems, providing stable power support for computers, printers, air conditioners and other equipment.​ In addition, the cable complies with relevant electrical standards, with a rated voltage of 450/750V, which can meet the voltage requirements of general indoor electrical wiring. During construction, due to its moderate outer diameter and good flexibility, it can easily pass through PVC conduits or metal conduits in the wall, adapting to different laying paths. At the same time, PVC material has good flame retardant performance, which can delay combustion when encountering an open flame, strive time for personnel evacuation and fire fighting, and improve the safety of electrical wiring.​ To sum up, the standard BVV cable 3 core 1.5mm² solid copper wire (red, blue, tinned wire), with its excellent conductivity of high-purity copper conductors, reliable protection of double-layer PVC insulation sheath, clear color identification and adapted specification design, has become an ideal choice for in-wall conduit electrical wiring, providing a solid guarantee for the safe and stable operation of indoor electrical systems.