It may be more difficult to detect the foot and foot on the meter, because customers generally do not have the equipment to actually measure the meter, and the same weight measurement method can be used to know whether the cable is full or not. Or it is a good method to print the rice mark when the factory produces it, but it should be noted that there is no way to print the rice mark for lines with a diameter of less than 5mm.
Cubic copper is a precious metal. If you lose a little on the copper diameter, you can reduce a lot of raw material costs. In this case, you need to use a micrometer to measure the diameter of the copper wire. If there is no micrometer, then the easier way is to weigh the whole coil of wire and see if it is much lighter than a good quality cable. Or refer to the nominal weight given by the factory. The nominal weight given by some factories is low, so it is naturally impossible to guarantee the quality of the product.
How to distinguish the internal quality of wire and cable:
The high-quality copper cable uses high-purity oxygen-free copper, the copper core has a bright color, and the surface of the poor copper wire is dull.
Plastics use high-quality native plastics, which have good bending performance. Bending the cable will not produce texture. Poor recycled plastics will have obvious textures after being bent a few times, and will break after being bent many times.
Accessories In order to ensure the roundness of the cable, for multi-core cables, filler will be added to the core, and the thickness of the sheath is relatively thick. If the cable you get is not very round, it means that the filler is rarely added. And the sheath is thinned.
Bundles of multi-strand copper wires are bundled during production to improve the tensile properties, roundness, electrical properties, and tightness of the insulation layer of the copper core, but because the bundles increase the amount of copper used, many The factory omitted this step, and the way to distinguish was to cut open the core of the cable to see if the copper wires inside were twisted regularly.
Braided cables with copper mesh braided layer, the braided layer accounts for a large portion of the cable raw material cost, and the coverage of the braided layer directly affects the electrical performance of the cable. At the same time, the tight braided layer can increase the strength of the cable and reduce the wire and cable The electrical performance of the cable decreases when it is bent. Therefore, it is an important means to distinguish the superior and inferior cables by seeing whether the braid covers a high coverage rate and the braid is uniform and fine.