There are good and bad cables and wires on the market, so how to choose? Today I will teach you how to choose a good cable scientifically. After all, it is impossible for each of us to be proficient in everything. Sometimes when we go shopping, we hope to find an expert to go with us, but the life circle is limited, and we may not be able to find such a person every time. At that time, we have to try it ourselves. We also blame this society for too much competition and a lot of fake and inferior products. How can we not be fooled? For example, we buy wires and cables.
The Pearl River Legend Cable tells you that the first method is to look at the outer covering of the wire; the outer covering of the standard temperature resistance of 80 degrees and 105 degrees generally uses semi-rigid PVC sheath (except for special wires), and the surface is smooth and soft. Moderate hardness, toughness, bending resistance (there should be no cracks after being bent at 90 degrees), and the nasal odor of the outer covering is weak; on the contrary, the wire covering made of secondary or tertiary material has a dark surface with bubbles and toughness It does not have the bending resistance (whitening and micro cracks will appear after 90 degree bending), and the outer nasal scent is strong.
The second is to look at the color and texture of the conductor copper wire; the standard conductor copper wire generally uses multiple strands of bare copper or multiple strands of tinned copper wire, with a bright surface (bright copper color), and good toughness. , Conductor resistance is small (take a sheathed wire of 2*0.5 square millimeters as an example, the resistance per kilometer is not more than 39 ohms); on the contrary, the copper-clad aluminum conductor is dark in color and easy to break (ignition with a lighter to melt) , Resistance and copper conductor are more difficult to distinguish.
It is understood that the conductor color of copper clad steel is golden flash yellow, high toughness (it is not easy to burn with a lighter), and the conductor resistance is large. The conductor color of copper clad iron is gray brass, with poor toughness, easy to break and high conductor resistance. The conductor of copper-clad mud is dark in color, poor in toughness, easy to break (it is ignited with a lighter and falls off as a powder), and the conductor resistance is unstable.