1, first of all: look at the appearance of copper stranded wire. Copper stranded wire purchase need to start from the appearance of observation, generally good copper stranded wire it is relatively bright appearance, serves to have obvious damage and scratches, there will be no obvious oxidation reaction produced by the phenomenon of discoloration. The outer edge of the color is more uniform, serves a black spot, serves a crack, the distance is uniform and regular. Meet the above criteria is a good choice of copper stranded wire.
2, second: look at the copper stranded wire specifications. The choice of copper stranded wire need to observe the scale and specifications of the line, the general copper stranded wire drawing needs to be within the scope of the provisions of the process can not exceed the standard, or else it is regarded as invalid stranded wire. Composition of stranded single line must meet the characteristics of uniform and neat, in line with the rules of the process.
3, again: look at the composition of copper stranded wire structure. Copper stranded wire purchase but also to observe the distribution and composition of the stranded wire structure, to see if there is a short line, lack of line, loose strands, the phenomenon of overlapping strands, generally these can be observed with the naked eye, we need to carefully observe the inspection of the quality of copper stranded wire, can not choose the unqualified products used in the production of wires and cables, which will result in serious safety accidents.
4, finally: look at the copper stranded wire welding process. Copper stranded wire purchase should also pay attention to whether the welding process is secure, the welded interface part is neat, serviced by the unevenness of the line. Welded interface should be repaired neatly, repair leveling, rubbing round, can not be tied, the welding head diameter generally can not exceed zero point two millimeters; two adjacent copper stranded wire welding should be maintained at a certain distance, spaced to be uniform.
