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High flexible cable is now used more and more widely, but with its popularity in the country's power supply lines, some of its security problems have gradually aroused people's attention, especially in recent years, the occurrence of cable fire is to remind people in the use of this cable should pay special attention to. So what are the reasons for the quality of the fire accident caused by high flexible cable? Let's take a look at the following.
1. The nominal section of conductor of cable core line does not meet the requirement. General provisions of the nominal interface is greater than the actual production of the cable, while the nominal value of the standard cable will have a larger unit current density, in its work in the cable is very easy because the heat can not be normal to cause a fire accident.
2, cable production process is poor. The so-called no-gang, although not every factory is the case, but there will inevitably be some businesses in the market for personal gain, in the production of cables in the process of not strictly operate in accordance with the standard. Even some businesses will use some inferior shoddy, resulting in the final production of the cable because the quality is not clearance in the use of the process caused by fire.
3. The material of cable is impure or unqualified. The core of the cable is mainly made of copper or aluminum conductive materials, and many businesses in the production process will often use unqualified or not enough material to replace, this will lead to its due to contain more impurities to reduce electricity. Therefore, the material used as cored wire must be some high-quality electrolyte materials, usually mainly copper and aluminum.
4, insulating material components do not meet the requirements or poor processing, we know that the outside of the cable is generally an insulating material to the core line package, if the insulation material quality is not qualified, it will be in use in the process of reducing its own pressure resistance, and will form an unqualified resistance value. In addition, long-term use will shorten its service life, it is easy to have some short-circuit fault caused by fire.
5. Improper transportation. Cable in the factory before the most stringent quality inspection, but in the course of transport because there is no proper protection measures to cause it to be squeezed collision, resulting in the insulation layer is damaged or the internal core line broken phenomenon.