How to distinguish the quality of cable and wire
It may be more difficult to detect whether the meter is enough, because the customer generally does not have the equipment to measure the meter. Similarly, the weight measurement method can be used to know whether the cable is enough.
It may be more difficult to detect whether the meter is enough, because the customer generally does not have the equipment to measure the meter. Similarly, the weight measurement method can be used to know whether the cable is enough. It's also a good way to print the meter mark when the factory produces, but it should be noted that there is no way to print the meter mark when the diameter is less than 5mm.
Zufang copper is a kind of precious metal. If we lose a little in copper diameter, we can reduce the cost of raw materials. In this way, we need to use a micrometer to measure the diameter of copper wire. If there is no micrometer, the easier way is to weigh the whole coil of wire to see if it is much lighter than high-quality cable. Or refer to the nominal weight given by the factory. The nominal weight given by some factories is too low to guarantee the product quality.
How to identify the internal quality of wires and cables:
High quality copper cable uses high purity oxygen free copper, copper core color is bright, poor copper wire surface is dim.
The plastic plastic uses high-quality original plastic with good bending performance. The cable bending will not produce texture. The poor recycled plastic will appear obvious texture after bending several times, and fracture after bending many times.
Auxiliary materials in order to ensure the roundness of the cable, for multi-core cables, fillers will be added to the core, and the thickness of the sheath is relatively thick. If the cable is not round, it means that the fillers are added very little, and the sheath is thin.
Bunched wire multi strand copper wire will be bunched during production to improve the tensile performance, roundness, electrical performance and tightness with the insulation layer of the copper core. However, because bunched wire will increase the usage of copper, many factories omit this step. The method to distinguish is to open the core wire of the cable to see if the copper wires inside are regularly twisted together.
Braided cable with copper mesh braided layer, braided layer accounts for a large part of the cost of cable raw materials, and the coverage of braided layer directly affects the electrical performance of the cable, at the same time, compact braided layer can increase the strength of the cable, wire and cable reduce the decline of the electrical performance of the cable in the bending state. Therefore, it is an important means to distinguish good and bad cables to see whether the braided layer has high coverage rate and uniform and fine braiding.