What is the relationship between sheath thickness and power cable quality?

Product quality is good or bad, the first manifestation of the product is the appearance of the quality of this product, no matter what kind of product, in the production must pay attention to the appearance of the quality of its implementation of strict control and inspection. Sheath is the appearance of power cables, its appearance requirements are smooth and round, gloss uniformity, not partial core (shall not exceed the prescribed deviation), no mechanical damage, flattening, no visually visible debris, bubbles, trachoma, obvious particles, bamboo shape, twisted shape. Sheath in addition to meet the above quality requirements, the thickness of the sheath has an important impact on the quality of power cables. Sheath thickness is lower than the standard requirements, of course, is unqualified, but the thickness exceeds the standard requirements, is also unqualified. For example: cable model ZR-KVVP 4 * 1.5mm2, the measured average thickness of the sheath thickness of 1.6mm, such models, such as reference to the GB9330-88 standard requirements, the thickness should be 1.2mm. cable was judged to be unqualified cable. Power cable is unqualified, usually leads to the following kinds of problems, even quality problems:
1. Reduce the service life. After the cable is laid, it will be energized for a long time, the energization will generate heat, the conductor allows the working temperature of 70 ℃, PVC long-term use temperature should not exceed 65 ℃, if in summer, the working temperature will rise, these temperatures will be emitted through the outer sheath, the sheath thickness increases, the heat is difficult to emit, it will affect the service life of the cable, because of the polyvinyl chloride in the action of the heat, so that the insulating layer occurs a series of physical and chemical changes, the loss of the cable. Because of polyvinyl chloride, under the action of heat, the insulation layer undergoes a series of physical and chemical changes, losing the original good performance, resulting in a significant decline in insulation performance, and even short circuit, affecting the normal operation of the unit.
2. Material performance defects. Material performance is not reflected through the thickness, in accordance with the GB8815-2002 standard requirements, that one of its indicators do not meet the standards, flame retardant PVC materials, that its oxygen index is lower than 30.
3. Cable structure problems. If the conductor, insulation, braided density, in accordance with the standard requirements for control, select the appropriate filler to make it round.
4. Increase the difficulty of cable laying. Now cable laying to bridge or through the pipe mainly, many companies are now practicing cable requirements tight, small outer diameter, in the laying process can have a gap, radiating heat, to ensure that the cable outer sheath is not damaged, otherwise, to the construction unit and cable laying to bring certain difficulties.

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