It also depends on the cross section of the copper core of the wire. Superior copper is bright and soft, otherwise it is inferior.
In fact, it is relatively simple to identify the brand of wires and cables, because generally, the wires and cables of better brands are beautifully packaged.
The packaging of wire and cable products is the same as other products. All large and medium-sized formal enterprises that produce products that meet the requirements of national standards attach great importance to product packaging.
Second, bend the end of the wire repeatedly by hand. Those with soft hand feel, good fatigue strength, elastic plastic or rubber hand feel and no cracks in conductor insulators are excellent products.
In order to make huge profits, producers of fake and inferior wires and cables disregard the interests of consumers, producing a large number of inferior wire and cable products, disrupting the wire and cable market and harming the interests of users.
Third, it is important to choose products with national standards. It is very important to choose wires and cables correctly. What kind of products meet the national standards? Wire and cable enterprises that meet the requirements of national standards will strictly control the procurement of raw materials, production equipment and production technology in order to improve product quality and ensure that products meet the requirements of national standards.
First, the appearance of wire and cable products produced by good wire and cable brands meets the standard requirements: smooth, round and even in color.
The appearance of fake and inferior products is rough and dull.
Secondly, for rubber-insulated flexible cables, the appearance should be round, and the sheath, insulation and conductor should be tight and not easy to fall off.
Fake and shoddy products have rough appearance, large ellipticity and low insulation strength of the sheath, which can be torn off by hand.
Third, the conductor is shiny, and the DC resistance and conductor structure size meet the requirements of national standards.
Wire and cable products that meet the requirements of national standards, whether aluminum conductors or copper conductors, are bright and oil-free, so the DC resistance of conductors completely meets the national standards, with good conductivity and high safety.
Fourth, the length is accurate.
Length is the main intuitive method to distinguish products that meet the requirements of national standards from counterfeit and shoddy products.
The length of wire and cable products that meet the requirements of national standards meets the national standard100 0.5m (i.e. 100m as the standard, with an allowable error of 0.5m), thus protecting the interests of consumers.
Four. Standard length of wire and cable At present, in the wire and cable sales market, some manufacturers, in order to attract users, mislead consumers, and even ignore the national standard product of 100 meters per lap, turn products (especially plastic wires) into 90 meters, which harms the interests of consumers and disrupts the wire and cable sales market.
Why do these manufacturers sell their products at 90 meters? The reason is that 10 meter is missing, which lowers the price and misleads consumers.
For example, the PVC insulated copper core plastic wire BV2.5_2 produced by a wire factory has a length of 90 meters printed on the certificate and an actual length of 82 meters; The sales price of such a circle of BV2.5_2 is higher than that of 50 yuan, which is 70-20-30 yuan less than the qualified BV2.5_2 product of a circle 100 meter produced according to the standard.
Violating national standards, seriously damaging consumers' interests and disrupting the wire and cable sales market.
Therefore, consumers must be cautious when buying wires and cables to prevent them from entering the misunderstanding of wire and cable purchase.
5. Don't be greedy for cheap. This is a common misunderstanding that quite a few users and even some enterprises use wires and cables.
In order to save money and ignore safety, some users specially select inferior wires and cables with low price, unreliable quality and great accident potential.
We know that due to the safety of wires and cables, the price of wires and cables can not meet the requirements of some users.
However, some individual and private enterprises can not meet the requirements of national standards in material selection, production technology and testing methods, and their safety will not be guaranteed. In addition, making a fuss about short feet and short meters will flood the market with its low price and cater to some users.
So please don't covet cheap wires and cables.
Electricity safety has always been a topic of concern in people's lives, so the purchase of wires and cables can not be ignored.