How to distinguish between good and bad wire and cable?

I. How to distinguish between good and bad wire and cable? Can be identified from the following aspects of wire and cable 1) copper: high-quality cables using high-purity oxygen-free copper, copper core color bright, poor copper wire surface is more dull. 2) plastic: plastic using high-quality virgin plastics, bending performance is good, the cable will not produce texture, poor recycled plastic in the bending several times after the texture will be obvious, after bending a number of times after the fracture 3) foot square: copper is a Precious metal, if the loss of a little bit in the copper diameter, you can reduce the cost of a large number of raw materials, in which case you need to use a micrometer to measure the diameter of the copper wire. If there is no micrometer, then a simpler way is to take the whole roll of wire weighing to see if it is much lighter than the quality of the cable. Or you can refer to the nominal weight given by the factory. Some factories give the nominal weight is low, naturally, can not guarantee the quality of the product. 4) full meter: in the meter on the feet may be more difficult to detect, because customers generally do not have the actual measurement of the meter of the equipment, the same use of the weight method will be able to know whether the cable is full of rice. Or let the factory production time to print the meter mark is also a good way, but note that the diameter of less than 5mm line is no way to print the meter mark. 5) Accessories: In order to ensure that the cable is rounded, for the multi-core cable will be added to the line in the core of the filler, and in the thickness of the sheath to do a thicker, if you get your hands on the cable is very not rounded, indicating that the filler added very little, and the sheath to do a thin. 6) bunch of wire: the copper wire in the production of multi-stranded wire will be used in the production of the cable is a good way to know whether the meter is enough. Multi-stranded copper wire in the production will be bundled to improve the tensile properties of the copper core, roundness, electrical properties and the insulation layer with the degree of tightness, but due to the bundled wire will increase the amount of copper used, so many factories omit this step, the way to distinguish is to cut open the core of the cable, to see if the inside of the copper wire is regular stranded together. 7) braided: with copper mesh braided layer of cables, braided layer accounts for a large part of the raw material cost of the cable, and the braided layer of the cable. A large part of the raw material cost of the cable, and the coverage of the braided layer, directly affecting the electrical properties of the cable, at the same time, tightly braided layer can increase the strength of the cable to reduce the electrical properties of the cable in the bending state of the decline. So see whether the braided layer coverage is high, woven uniformly fine, is an important means of distinguishing between good and bad cables. 8) Foaming: Some cables need to foam the insulation layer to strengthen its electrical properties, foaming mainly chemical foam and physical foam, chemical does not require special production equipment, it is inexpensive, but it produces a different size of the bubbles, the electrical properties of the poor. Physical foaming requires expensive production equipment, but it produces uniform and dense bubbles, bending state, attenuation is small, there is a very good electrical properties. You can cut open the core of such a cable and observe whether its foam layer is uniform and dense bubbles.

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