PVC insulated copper cables (4mm², 6mm², 16mm², 25mm²) are core wires designed specifically for residential electrical wiring. With high-purity electrolytic copper as conductors and polyvinyl chloride (PVC) as insulation layers, they are widely used in household lighting, socket power supply, and high-power appliance connections due to their complete specifications, stable performance, and moderate cost, providing safe and reliable transmission guarantees for residential power systems.​ In terms of specification design, this series of cables covers common cross-sections from 4mm² to 25mm², accurately matching different power load requirements: 4mm² cables are suitable for medium-power equipment such as wall-mounted air conditioners and electric water heaters, with a continuous current-carrying capacity of up to 25A (at an ambient temperature of 30℃); 6mm² cables can carry 32A current, adapting to high-power appliances such as cabinet air conditioners and ovens; 16mm² and 25mm² cables are used for residential main incoming lines and main trunk lines of distribution boxes, with current-carrying capacities of 70A and 90A respectively, which can meet the load requirements of simultaneous power consumption in multiple areas. This stepped specification design not only avoids material waste in low-load scenarios but also ensures the power supply safety of high-power equipment.​ In terms of materials, the conductors are made of high-purity stranded copper with a conductivity of over 98%, which not only reduces current transmission loss but also improves flexibility through multi-strand copper wire stranding, facilitating bending and laying in narrow spaces such as wall embedding and floor pipe wear，reducing construction difficulty. The insulation layer is made of rigid PVC material with a temperature resistance of 60-70℃, which has good insulation resistance (≥100MΩ) and voltage resistance performance (can withstand 2000V AC voltage for 1 minute without breakdown). It can effectively isolate current, resist daily wear and minor chemical corrosion, and has a flame retardant rating of UL94 V-0, which is not easy to spread when exposed to fire, adding a line of defense for residential fire safety.​ In residential wiring, the application scenarios of this series of cables have clear divisions of labor: 4mm² and 6mm² cables are mostly used in branch circuits, such as bedroom sockets and dedicated lines for kitchen appliances; 16mm² cables are often used for main trunk lines from the main distribution box to the distribution boxes on each floor; 25mm² cables are adapted to the main incoming lines of villas and large-sized residences, ensuring stable distribution of incoming power. The color of its PVC insulation layer follows international specifications: phase wires are brown/black, neutral wires are blue, and ground wires are yellow-green two-color. The intuitive color distinction can reduce wiring misoperations and improve construction efficiency.​ The product strictly complies with standards such as GB 5023.3-2008 "Polyvinyl Chloride Insulated Cables with Rated Voltage up to 450/750V" and has passed multiple tests such as insulation thickness, conductor resistance, and aging resistance to ensure the quality consistency of each meter of cable. Whether it is pre-embedded wiring in new residences or line renovation of old houses, this series of cables can be an ideal choice for residential electrical systems with the advantages of strong adaptability, convenient installation, and a service life of more than 15 years.