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How to identify fake and inferior wires and cables?


As an important carrier of power transmission, wires and cables are widely used in industrial production. If inferior wires and cables are used, it may cause short circuit and electric shock if it is light, and may cause fire and cause casualties if it is serious. The quality of wires and cables can be directly related to To the quality of engineering construction and the safety of people's life and property. So, how to distinguish inferior wire and cable?

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As a special necessity, wires exist in our lives, which are related to the safety of our lives and properties, as well as the normal operation of other industries. It has a wide range of applications, especially in the use of temporary wires and indoor wires for home decoration. If fake and shoddy wires and cables are used, it may cause short circuit and electric shock, and cause fire accidents, causing casualties and property losses. Therefore, we must refuse to use fake and shoddy cables and accurately identify fake and shoddy wires and cables products.

The main characteristics of inferior wires and cables:

1. The cable length is not up to standard

The most typical is cloth silk packaged in rolls. The national standard stipulates that the length of each roll is 100 meters, and the measurement error is not more than 0.5%, and the length of each roll is 100±0.5 meters. , but some manufacturers mark 100±20 meters on the qualified card, but in fact the product length is only 80 meters. This is relatively easy to identify. You can control the quality of the wire and cable by looking at the qualified card and the length of the random inspection, because the electric wire is relatively soft and easy to detect.

2. The resistance value does not meet the national standard

The temperature of the wire with the resistance value exceeding the standard may be too high under the same current, which will accelerate the aging of the outer insulation layer, cause a short circuit, and cause a fire; and because the resistance value exceeds the standard, it will greatly increase the energy consumption of the power transmission process and increase the cost of electricity.

3. Poor quality raw materials

(1) Poor raw materials are mainly found in wire and cable products with copper as the conductor, and are the most common. Copper conductors account for 80% of the cost of wires. Unscrupulous manufacturers will also use methods such as reducing the quality of copper materials, purchasing impurity copper, recycling copper, and even copper smelting by local methods, resulting in unstable copper content and poor resistivity of copper conductors. increase. Another more direct way is to reduce the amount of copper material, reduce the actual cross-sectional area of the copper core, so that the production standards of wire and cable are not up to standard, and become what everyone calls inferior wire and cable. The consequences of these two methods will be As a result, the temperature of the wire is too high during use, the insulation heats up, damages the insulation layer, causes a short circuit and causes a fire.

(2) Reduce the product quality of the plastic used in the cable insulation materials, and use recycled insulation materials with high impurity content, low mechanical strength, low aging resistance and electrical insulation performance. This practice will lead to leakage of electric wire and cable insulation layer is not up to standard.

Identification of inferior wires and cables

1. Look at the label: the content of the wire certificate produced by a regular manufacturer should include: 3C certification mark, certification number, model specification, implementation standard, rated voltage, wire length, production date, producer, inspector, factory name, factory address, Fixed telephone, anti-counterfeiting label, etc.

2. Look at the surface: the plastic sheath of regular wires is soft and smooth, and the color is uniform. On its surface, the content on the product certificate should also be printed.

3. Trial bending: It is advisable to bend a wire head repeatedly by hand. Those with soft hand feeling, good fatigue resistance, high elasticity of plastic or rubber and no cracks on the wire insulation layer are superior products. The insulation layer of fake and inferior wires seems to be very thick, but in fact, most of them are supported by recycled plastics. After repeated bending, they will appear white when extruded, and even disconnected.

4. Tear insulation: The insulation layer of high-quality products has certain mechanical strength and flexibility, and cannot be easily torn.

5. Look at the burning: according to the regulations, the insulating layer of the wire has a certain flame retardancy. Peel off a section of insulation and ignite it with fire. It is the inferior wire that can continue to ignite spontaneously after leaving the open flame.

6. Look at the copper wire: the color of the high-quality copper wire is bright and reddish, while the poor-quality copper core wire is purple-black, blackish, yellowish or white, with high hardness, many impurities, poor mechanical strength and poor toughness. , It will break with a little force, and there are often disconnections in the wire.