The quality of the general product is good or bad, and […]
The quality of the general product is good or bad, and its first characteristic is reflected from the quality of the product appearance.
No matter what kind of products, or semi-finished products, in production must pay attention to the quality of appearance, strict control and inspection of the actual. Cable sheath is appearance, its appearance is smooth, shiny uniform, not partial core (not to exceed the specified deviation), no mechanical damage, compressed, without visual debris, bubbles, blisters, clear particles, bamboo shaped, twist shape etc.. In addition to the above quality requirements, the sheath thickness also has some influence on the quality of the cable.
Sheath thickness is lower than the standard requirements, of course not qualified, but the thickness exceeds the standard requirements, is also unqualified.
For example: the cable model is ZR-KVVP 4*1.5mm2, and the average thickness of the sheath is 1.6mm. If the model is in accordance with the GB9330-88 standard, the thickness should be 1.2mm.
There are several reasons for disqualification:
1. reduce service life.
After a long time of cable laying, electricity, electricity will generate heat conductor allowable working temperature is 70 DEG C, PVC long-term use temperature should not exceed 65 degrees, if in the summer, the temperature will rise, the temperature will be through the outer layer emitted, sheath thickness increases, heat is difficult to send out, will affect the cable service life for PVC, under the action of heat insulating layer, make a series of physical and chemical changes, the loss of the excellent performance of the original, the insulation properties decreased, or even short circuit, affect the normal operation of machine group.
2. material performance defects.
The material performance is not reflected by the thickness. According to the GB8815-2002 standard, one of its indexes is not up to standard. The flame retardant PVC material has an oxygen index below 30.
3. cable structure problems.
If the conductor, insulating layer and weaving density are controlled according to the standard, choose the proper filling material to make it round. How can the sheath be so thick?
4. increase the difficulty of cable laying.
Now the cable laying to bridge or wear tube, now many enterprises in the implementation of the cable tight, small diameter, can the gap in laying in the process of sending out heat, ensure the cable outer sheath is not damaged, otherwise, bring some difficulties to the construction unit and cable laying.
In summary, sheath thickness is not as thick as possible, should be in accordance with the standard control, which not only for enterprises to save resources, reduce material consumption, increase profits, and can guarantee the quality of the cable, creating high quality and low price products.log on to our official website for more details :http://www.fuucable.com/