Cables and wires are generally used in the use of engin […]
Cables and wires are generally used in the use of engineering users and construction projects:
1. National standard cable: The cable produced according to the relevant cable standard technology issued by the country is abbreviated as international line.
2. Line Labeling: According to industry standards, there is mainly less cutting and cutting, but it does not affect the large performance.
3, non-standard cables: products that should be born to meet the needs of the city. Nowadays, the application of wire and cable is more and more extensive. Along with it, there are more and more types of wires and cables sold on the market. Then, how to distinguish the "national standard" and "non-standard" of the wire and cable? It is recommended that you look at it, try it out, try it out, get it weighing it, compare it with the price, look at it with the bronze, and check it with six quality.
A look: to see whether the wire and cable products quality system certification, see whether the certificate is standardized, see if there is a factory name, site, inspection seal, production date, see if the wire is printed with trademarks, specifications, voltage and so on. Also look at the cross section of the wire copper core, superior product copper color bright, soft color, otherwise it is defective.
Second test: It is desirable to repeatedly bend a wire head by hand. All products are soft and have good fatigue resistance, plastic or rubber feel elasticity, and no crack on the wire insulation.
Three weighs: good quality wire and cable, generally within the specified weight range per 100m weight. For example, a commonly used plastic insulated single strand copper core wire with a cross-sectional area of 1.5mm2 is 1.8-1.9kg per 100m; 2.5mm2 plastic insulated single strand copper wire is 3-3.1kg per 100m; 4.0mm2 plastic Insulated single-stranded copper wire weight is 4.4-4.6kg per 100m. Poor quality wires have insufficient weight or are either of insufficient length or have too many impurities in the wire copper core. If it is a cable, especially a large-sized cable, the method of weighing the soil is the easiest way to show whether the cable contains copper and whether the cross section of the conductor is sufficient. Generally, there is a cable with a small cross-section if the cable is stealing copper. The weight of copper can not be within the range of the weight allowed by the national regulations, and it can basically be considered as non-standard.
Four-price ratio: Because of the low production cost of counterfeit and shoddy wires, when selling, traders often sell cheap goods at low prices, making people fooled. Therefore, when buying, be careful not to dazzle your mind for the “high quality and low price” advertised by the business and finally be deceived. Five to see the copper. Qualified copper core wire copper core should be purple, shiny and soft to the touch.
Five to see the copper material: shoddy copper wire copper core is purple black, yellow or white, impurities, mechanical strength, poor toughness, it will break a little hard, and often within the wire breakage phenomenon. In the inspection, you just strip the wire for a while and then use a piece of white paper to make a slight twist on the copper core. If there is black material on the white paper, it means that there are more impurities in the copper core and you can identify it as "non-standard. "Wire and Cable.
Six quality inspection: In the case of disagreement on the quality of the cable, it can be sent to a third-party testing agency for testing. The authoritative test report is based on whether or not it is qualified.