Hazard of unqualified wire and cable

Wire and cable is used to transmit power, transmit information and realize the electromagnetic energy conversion of a class of electrical products. In the process of spot check, found a large number of unqualified products, these inferior products to the normal operation of the power system buried many hidden dangers.

1, mark unqualified wire and cable. Mark is the main way to use wire and cable to identify the basic information of the product, according to the standard provisions of the main content of the mark is: product model, specification, standard number, factory name, origin and so on in a certain mark spacing, when the mark is unqualified, it will cause the construction personnel identification error, serious will cause electrical accidents.

2. Wires and cables with unqualified structure and size. The main problem of structure size is the sheath thickness, insulation thickness, when the sheath and insulation thickness of the cable is not up to standard, the electrical strength of wire and cable will be seriously reduced, leading to the shortened service life of wire and cable, serious can lead to wire and cable breakdown, insulation (sheath) layer can not play a normal protective role, resulting in electrical short circuit and fire phenomenon.

3, sheathed insulation before aging tensile strength, elongation of qualified wire and cable. The tensile strength and elongation of insulation sheath before aging greatly shorten the working life of wire and cable directly, and in construction or in a long time energized and high temperature environment, it is easy to break the insulator, resulting in live conductor exposed, electric short circuit risk. The main reason for its unqualified is the use of recycled material production, in order to reduce the cost of products, the second is not qualified for production of small enterprises.

4, conductor resistance is not qualified wire. Conductor resistance is an important index to check whether the conductor material and section of wire and cable meet. When the conductor resistance exceeds the standard, it increases the loss when the current passes through the wire and intensifies the heating of the wire and cable. The main reason for unqualified conductor resistance is that in order to reduce costs, enterprises shrink copper material, which accounts for 80% of the cost of raw materials. They either reduce the cross-sectional area of conductors or use recycled copper containing excessive impurities, which causes the conductor resistance of wires and cables to exceed the standard seriously. In addition to easily causing fire in the process of use, it will accelerate the aging of the insulation layer covered in wires.

In the process of buying wire and cable, consumers should pay attention to the following things

First, to observe the appearance of the wire. The insulation (sheath) layer of qualified products is soft, ductile and flexible, and the surface layer is tight, smooth and without rough feeling. If the plastic that wraps the wire is easily peeled off, there is a problem that the plastic is not strong enough.

Second, look at the section of the wire. The copper or aluminum core surface of the qualified product shall have a metallic luster. Blackened copper or white aluminum indicates that it has been oxidized.

Third, when buying wire should pay attention to check the quality certificate. If the quality of the wire is up to standard, then the quality of the wire should also be tested and there should not be too much problem.

Aichie Tech Electronic specializes in the production of wiring harness & cable assembly, wire and cable and connector, the factory is UL, CUL listed factory, the use of high quality materials strictly control product quality, is committed to provide customers with high reliability and high quality products, safety and durable.

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