1, look at the packaging
Look at the complete certificate in the package. The certificate should include complete information such as specifications, implementation scale, rated voltage, length, date, and factory name. Look at the "CCC" and production license number of China's national compulsory product certification; see if there is a quality system certification; see if the certificate is standardized; see if the trademark is printed on the wire, specifications, voltage, etc.
2, check the wire size
Delineation in the relevant scales, the error of the length of the wire can not exceed 2%, and the diameter of the section should not exceed 0.02%. However, there are a large number of short-and-shrinking lengths in the market, and the phenomenon of falsification on the cross-section.
3, look at the color of copper
The copper core of the qualified copper core wire should be purple, shiny and soft to the touch. The fake copper core copper core is purple, yellow or white.
4, look at the insulation rubber
The shoddy wire insulation layer looks very thick. In fact, it is mostly made of recycled plastic. As long as it is squeezed slightly, the extrusion will be white and powder will fall.
5, look at the weight of the wire
Good quality wires are generally within the defined weight range. For example, a commonly used plastic insulated single-strand copper core wire having a cross-sectional area of ​​1.5 mm 2 is 1.8 to 1.9 kg per 100 m.
6, look at the wire core size
A few cores generally refer to a cable. It refers to the presence of several insulated conductors inside the insulation sheath. Several of them are several cores. If there is no insulation between them, how many are counted as one core. Two cores refer to two insulated wires wrapped together, generally used in household electricity within 220V. There are two kinds of three cores, one is a two-phase three-wire system, one is a three-phase three-wire system, four cores are three-phase four-wire system, three fire wires, one neutral wire, and five cores are three-phase five-wire system.
7, look at the brand
Longkou Libo Insulating Material Co.,Ltd. , https://www.sdliboinsulation.com