How can I really recognize the good and bad quality of cables and wires?

Foot rice in the meter on the hands of the foot may be more difficult to be detected, because customers generally do not have the actual measurement of the meter of the equipment, the same use of the weight measurement method will be able to know whether the cable is full meter. 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. Foot square copper is a precious metal, if the copper diameter in the loss of a little, you can reduce the cost of raw materials a lot, in which case you need to use a micrometer to measure the diameter of copper wire. If you don't have a micrometer, then a simpler way is to take a whole roll of wire and weigh it to see if it's much lighter than a good quality cable. Or you can refer to the nominal weight given by the factory. Some factories give a low nominal weight, naturally, can not guarantee the quality of the product. How to identify the quality of wire and cable internal: copper quality cable using high purity oxygen-free copper, copper core color bright, poor copper wire surface is more dull. Extruder plastic plastic using high-quality virgin plastic, bending performance is good, bending the cable will not produce texture, poor recycled plastic in the bending a few times there will be obvious texture, bending many times after the fracture. Cable equipment accessories in order to ensure the roundness of the cable, for multi-core cable will be added to the core of the line filler, and in the thickness of the sheath to do a thicker, if you get your hands on the cable is very not round, indicating that the filler added very little, and the sheath to do a thin. Cable equipment bundle wire multi-stranded copper wire in the production will be bundled to improve the tensile properties of the copper core, roundness, electrical properties and the degree of tightness of the insulation layer, but due to the bundle will increase the amount of copper used, so many factories omit this step, the method of distinguishing is to cut open the core of the cable, to see if the copper inside the regular stranded together. Braided with a copper mesh braided layer of cable, braided layer accounts for a large part of the cost of raw materials for 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, wire and cable to reduce the cable in the state of the decline in electrical properties in the bending. So see whether the braided layer coverage is high, uniform and dense weave, is an important means of distinguishing between good and bad cable.

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