Power cable quality is related to the thickness of the jacket

Product quality is good or bad, good or bad, its characteristics are 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 power cables, its appearance requirements are smooth and rounded, 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, and so on. Sheath in addition to meet the above quality requirements, the thickness of the sheath on the quality of power cables also have 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 the GB9330-88 standard requirements, the thickness should be 1.2mm. ruled that it fails for the following reasons: 1. to reduce the service life. After laying the cable, long time power, power will produce heat, conductor allowable operating temperature of 70 ℃, PVC long-term use temperature should not exceed 65 ℃, if in the 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 role of the heat to make the insulating layer undergoes a series of physical and chemical changes, the loss of service life, the insulation layer will be affected by the heat. Because 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. Defects in material performance. 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, according to standard requirements for control, select the appropriate filler material 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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