When choosing a cable, you should choose the cable according to your own site usage, and don't try to be cheap. I thought that the cable was cheap and guaranteed to be of the national standard. Fudge users who are not professional and do not understand the industry. In order to enable users to more clearly understand the quality standards of cables and wires and self-judgment the difference between national standards and non-standards. Below we combine the actual situation that engineering users and the cable industry often encounter, let everyone do a simple understanding.
Cables and wires are generally used in engineering users and construction projects. These three types of cables appear:
1. National standard cable: The cable produced according to the technology of the relevant cable standard issued by the country is referred to as the international cable.
2. Industry standard cable: According to industry standards, there are less cutting corners, but it does not affect the performance.
3. Non-standard cables: products born to meet the needs of the city. Nowadays, wires and cables are more and more widely used, and subsequently, more and more types of wires and cables are sold on the market.
So, how to distinguish the "national standard" and "non-standard" of wires and cables?
It is recommended that you have a look, a second test, three weighings, four price comparisons, five copper quality inspections, six quality inspections, and six tricks to see the difference.
One look: It depends on whether the wire and cable product has a quality system certification, whether the certificate is standardized, whether there is a factory name, site, inspection stamp, and production date, and whether there are trademarks, specifications, voltages, etc. printed on the wires. It also depends on the cross section of the copper core of the wire. The high-quality copper is bright in color and soft in color, otherwise it is inferior.
Second test: A wire head can be repeatedly bent by hand. Anything that is soft to the touch, good in fatigue resistance, elastic in plastic or rubber, and has no cracks on the wire insulator, is an excellent product.
Three weighing: Good quality wire and cable, generally every 100m weight is 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, weight 1.8-1.9kg per 100m; 2.5mm2 plastic insulated single-strand copper core wire, weight 3-3.1kg per 100m; 4.0mm2 plastic Insulated single-strand copper core wire, weighing 4.4-4.6kg per 100m, etc. Poor quality wires have insufficient weight, either the length is not enough, or the copper core of the wires is too impurity. If it is a cable, especially a large-size cable, the method of weighing is a method that can directly reflect whether the copper content of the cable meets the standard and whether the conductor cross-section is sufficient. Generally, there are cables with small cross-sections made of copper. If the cable contains copper After the weighing fails to reach the weight range allowed by the national regulations, it can basically be regarded as non-standard.
Four-comparison price: Because of the low production cost of counterfeit and shoddy wires, vendors often sell them at low prices under the guise of low prices and good quality when selling. Therefore, when making a purchase, be careful, and don't be fooled by the merchant's advertised "good quality and low price". Five look at copper. The copper core of the qualified copper core wire should be purple-red, shiny and soft to the touch.
Five look at the copper material: Fake copper core wire The copper core is purple-black, yellowish or white, with a lot of impurities, poor mechanical strength, poor toughness, it will break with a little force, and there are often broken wires in the wire. During inspection, you only need to peel off one end of the wire, and then rub a piece of white paper on the copper core a little. If there is a black substance on the white paper, it means that there are more impurities in the copper core, which can be regarded as "non-standard" "Wire and Cable.
Sixth quality inspection: In the case of differences in cable quality, it can be sent to a third-party inspection agency for inspection. Based on whether the test report is qualified.
