What problems are encountered when sheathed cables fail?

I. What problems will be encountered if the sheathed cable is not qualified? (1) Reduce service life. After the cable is laid, it will be energized for a long time, and the energization will generate heat energy, the conductor allows the working temperature to be 70 ℃, the long-term use of polyvinyl chloride temperature should not be more than 65 ℃, if in the summer, the working temperature will rise, these temperatures will be emitted through the outer sheath, the thickness of the sheath is increased, the heat is difficult to be emitted, which will affect the service life of the cable, because the polyvinyl chloride in the action of the heat, so that the insulating layer occurs a series of physical and chemical changes. 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) 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 standard, 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 is 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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