How does sheath thickness relate to cable quality?

I. How is the relationship between sheath thickness and cable quality? Product quality is good or bad, good or bad, one of the characteristics is reflected from the appearance of the product quality, no matter what kind of product, or semi-finished products, 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 the cable, its appearance requirements are smooth and round, glossy and uniform, 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, sheath thickness of the cable quality also has a certain impact. 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 GB9330-88 standard requirements, the thickness should be 1.2mm.

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