PVC insulated flexible copper wires of 1.5mm² and 2.5mm² (IEC 60227-5) are two types of general-purpose electrical cables that comply with the International Electrotechnical Commission (IEC) 60227-5 standard. With their flexible characteristics and reliable performance, they play an important role in various electrical connection scenarios.​ The conductors of both cables are made of multiple strands of fine copper wires twisted together. This structure endows them with excellent flexibility, enabling them to easily cope with complex laying environments such as frequent bending and twisting. They are especially suitable for connecting electrical equipment that needs to be moved or adjusted frequently, such as household appliances, office equipment, and small power tools. The cross-sectional specifications of 1.5mm² and 2.5mm² correspond to different current-carrying capacities. The rated current-carrying capacity of the 1.5mm² cable is about 14-20A, which is suitable for power supply of lighting circuits and small household appliances (such as table lamps and laptop chargers). The rated current-carrying capacity of the 2.5mm² cable is about 20-25A, which can meet the electricity demand of medium-power appliances such as microwave ovens and vacuum cleaners.​ The insulation layer is made of high-quality polyvinyl chloride (PVC) material, which has good electrical insulation performance, wear resistance, and chemical corrosion resistance. Its insulation thickness is strictly controlled. The insulation thickness of the 1.5mm² cable is about 0.6mm, and that of the 2.5mm² cable is about 0.7mm, which can effectively isolate the current and prevent leakage and short-circuit accidents. At the same time, the PVC insulation layer also has certain temperature resistance, with a normal operating temperature range of -15℃ to 70℃, which can adapt to temperature changes in most indoor environments.​ Complying with the IEC 60227-5 standard is one of the core advantages of this cable. This means that it has passed strict tests in terms of conductor material, insulation performance, mechanical strength, and aging resistance, ensuring the safety and consistency of the product. The standard clearly specifies the structure, dimensional deviation, voltage test, mechanical performance test, etc. of the cable. For example, in the voltage test, the cable must be able to withstand an AC voltage of 1500V for 5 minutes without breakdown, which fully ensures electrical safety during use.​ In terms of application scenarios, 1.5mm² and 2.5mm² PVC insulated flexible copper wires are widely used in fixed or mobile electrical installations in civil and industrial fields. In homes, they can be used to connect lighting equipment such as chandeliers and wall lamps, as well as power lines for office appliances such as TVs and printers. In commercial places, such as offices and shopping malls, they are often used for temporary power supply lines and internal wiring of equipment. In industrial environments, they are suitable for wiring of small motors and instruments. In addition, their flexible characteristics make them easy to lay in narrow spaces or complex paths, reducing installation difficulty.​ The appearance of the two cables is usually a single-color insulation layer, with common colors such as white, black, and gray, which is convenient for distinguishing different circuits. The packaging form is mostly supplied in rolls, with lengths generally 100 meters or 500 meters, which is convenient for cutting according to actual needs. Overall, PVC insulated flexible copper wires 1.5mm² and 2.5mm² (IEC 60227-5) have become indispensable basic cable products in electrical connections due to their high flexibility, strong safety, and wide application range.