How to distinguish between "national standard" and "non-standard" wires

There are more and more kinds of wires and cables in the market. How to distinguish between "national standard" and "non-standard" of wires and cables? One look, two tests, three weighing, four price comparisons, five copper, five strokes are known.

Now, the application of wires and cables is more and more extensive. With this, there are more and more kinds of wires and cables sold in the market. So, how do we distinguish between "national standard" and "non-standard" of wires and cables? To this end, Xiaobian consulted senior people in the industry, who gave five tips to distinguish between "national standard" and "non-standard" wires and cables:

First, we should see whether the wire and cable products have quality system certification, whether the certificate is standardized, whether there is factory name, address, inspection seal and production date, and whether the wire is printed with trademark, specification, voltage, etc. It also depends on the cross section of the copper core of the wire. The superior red copper has bright color and soft color, otherwise it will be defective.

Second, a wire head can be bent repeatedly by hand. Those with soft hand feeling, good fatigue resistance, large hand elasticity of plastic or rubber and no cracks on the wire insulator are excellent products.

For wires and cables with three weights and good quality, the weight per 100m is generally within the specified weight range. For example, the commonly used plastic insulated single strand copper core wire with a cross-sectional area of 1.5mm2 has a weight of 1.8-1.9kg per 100m; 2.5mm2 plastic insulated single strand copper core wire, with a weight of 3-3.1kg per 100m; 4.0mm2 plastic insulated single strand copper core wire, with a weight of 4.4-4.6kg per 100m, etc. The wire with poor quality has insufficient weight, or insufficient length, or too many impurities in the copper core of the wire.

Four price comparison. Because the production cost of fake and shoddy wires is low, vendors often sell at low prices under the guise of low price and good quality. Therefore, when buying, be careful not to be confused by the "high quality and low price" advertised by the merchant, and finally be deceived.

Fifth, look at the copper and qualified copper core wires. The copper core should be purplish red, shiny and soft. The copper core of fake and shoddy copper core wire is purple black, yellow or white, with many impurities, poor mechanical strength and poor toughness. It will break with a little force, and there are often wire breaks in the wire. During the inspection, you just peel off one end of the wire, and then rub it on the copper core with a piece of white paper. If there are black substances on the white paper, it indicates that there are many impurities in the copper core, which can be identified as "non-standard" wires and cables.