Wire, as an indispensable electrical material in home decoration, its quality is directly related to the safety of electricity and quality of life. In the selection of wires, we often hear specifications such as 1.5 square, 2.5 square, etc., what do these numbers represent? This article will answer your questions and guide you on how to pick a high-quality wire.
First, what is the square size of the wire?

The square of the wire refers to the cross-sectional area of the conductor of the wire, in square millimeters (mm²). For example, BV 2.5 represents a copper conductor, PVC insulated, with a conductor diameter of 1.78mm and a cross-sectional area of 2.5mm². When choosing a wire, it is also necessary to pay attention to an important indicator - current carrying capacity, that is, under certain conditions, the current value that a unit of cross-sectional area of the conductor can continue to carry without heating up. In general, the safe carrying capacity of copper wire is 5~8A/mm², and aluminum wire is 3~5A/mm².

Taking 2.5mm² BV copper wire as an example, the recommended safe carrying current value is 2.5 ×8A/mm²=20A, while the BV copper wire of 4mm² is 4×8A/mm²=32A.

Second, the selection and use of wires in family decoration

1. Check the CCC authentication mark. Wire and cable products are directly related to the life and safety of consumers, therefore, the state requires such products to pass the "CCC" certification to ensure quality and safety. When purchasing, be sure to check whether the product has a "CCC" certification mark.

2. Check the insulation layer. The national standard requires that the insulation layer thickness of the wire should be uniform and tightly wrapped on the conductor to ensure the insulation effect.

3. Select high-quality core. High quality wire core should be selected high purity copper material, after strict production process treatment, the surface is bright, smooth, tightly twisted, flexible and not easy to break.

4. Appearance quality. The appearance of high-quality wires should be smooth and round, and the color is uniform, which reflects the strict control of the production enterprise in the purchase of raw materials, production equipment and technology.

5. Quality of conductor. High-quality wire conductors should have luster, DC resistance, conductor structure size, etc. should meet national standards to ensure good electrical conductivity and safety.

In practical applications, such as connecting a 1000W electrical appliance, according to I=P/U (current = power/voltage), about 5A. Under normal circumstances, a square of the wire carrying capacity is about 5~8A, so 1 square of the line is enough to use. However, if it is a national standard copper cable, the aluminum wire needs at least 1.5 square.

In home decoration, the lighting circuit usually uses 1.5 square lines, which can ensure the use of lamps of about 2500W. For devices with high power, such as bath bullion, it is recommended to use 2.5 square wires. Sockets usually use 4 square lines to meet the needs of connecting multiple appliances at the same time. It is recommended that air conditioners be routed separately to avoid running at full load and accelerate aging. Because of its large power, it is recommended to use 6 square or larger wires, and equipped with the corresponding current of anti-leakage air switch.

In terms of wire consumption estimation, the safe current of 1.5 square of the national standard line is 7.5~12A, and the carrying power is 1650W~2640W. The safe current of 2.5 square is 12.5~20A, and the carrying power is 2750W~4400W. The safe current of 4 square is 20~32A, and the carrying power is 4400W~7040W. The safe current of 6 square is 30~48A, and the carrying power is 6600W~10560W. Multi-core cords of 10 square meters and above are commonly used in household lines.

In short, in the home decoration, the selection of wires should pay attention to the brand, combined with the actual needs, select the right wire specifications, to ensure the safety of electricity and quality of life.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable.