The main factors affecting the cable quality include copper conductor, insulation and the quality of sheath. According to the conventional understanding, the thicker the materials used on the sheath, the better the cable protection. In fact, this is not the case. There is no need to be the thinnest or the thickest. The cable models and specifications are different. Only those that meet the national standards are good.

Unqualified cable sheath thickness will reduce the service life of wire and cable products: when the cable is put into use for a long time, it will be corroded by external media for a long time in the environment of direct burial, immersion, open air or easy to be corroded, and the insulation level and mechanical level of the thinnest point of the sheath will decrease. If it is very thick, the working temperature will rise in summer, and these temperatures will be emitted through the outer protective layer. The thickness of the sheath increases, and the heat energy is difficult to be emitted, which will affect the service life of the cable. Moreover, under the action of heat, PVC will cause a series of physical and chemical changes in the insulating layer, lose the original excellent performance, and lead to a significant decline in the insulating performance, Short circuit may even occur. The allowable working temperature of conductor is 70 ℃, and the long-term service temperature of PVC should not exceed 65 ℃. Therefore, wires and cables are actually in a situation of "internal and external troubles".

At present, cable laying is mainly based on bridge or through pipe. Too thick cable insulation will increase the difficulty of cable laying. Therefore, when selecting the cable, the thickness of the cable must be moderate, and the thickness of the sheath shall strictly comply with the relevant standards, otherwise it can not protect the wires and cables.

The quality of cable can be reflected from the appearance quality of products. Therefore, cable manufacturers must pay attention to the appearance quality and strictly control and inspect it in production. Then, the appearance of the cable sheath shall be smooth and round, the conductor luster shall be uniform, the core shall not deviate (no more than the specified deviation), there shall be no mechanical damage, flattening, insulation, no visible sundries, bubbles, sand holes, obvious particles, bamboo joint shape, twist shape, etc. In addition to meeting the above quality requirements, the sheath thickness also has a certain impact on the cable quality. We must produce according to national standards. Boyi cable only makes national standard products. Each product is subject to the whole process inspection according to the requirements. We can purchase at ease.