We need to see. See whether there is a quality system certificate; See whether the certificate is standard; See whether there is a factory name, factory address, inspection seal, production date; See if the wire is printed with trademarks, specifications, voltage, etc. Also look at the cross section of the wire copper core, excellent copper color bright, soft color, otherwise it is defective.

I will try. It is advisable to bend a wire head repeatedly by hand, and those with soft feel, good fatigue strength, large plastic or rubber feel elasticity and no cracks on the wire insulator are excellent products.

Weigh yourself. Good quality wires are 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 100 meters; 2.5mm2 plastic insulated single strand copper core wire, weight of 3 ~ 3.1kg per 100 meters; Poor quality wire weight is insufficient, either the length is not enough, or the wire copper core impurities are too much.

Look at the copper. Qualified copper wire copper core should be purple, shiny, soft. The shoddy copper core wire is purplish black, yellow or white, many impurities, poor mechanical strength, poor toughness, a little force will break, and the wire is often broken. When checking, you just peel off one end of the wire 2cm, and then rub a piece of white paper on the copper core slightly, if there is black material on the white paper, it means that there are more impurities in the copper core. In addition, the insulation layer of shoddy wire seems to be very thick, in fact, most of them are made of recycled plastic, and over time, the insulation layer will age and leak electricity.

Look at the price. Because of the low production cost of fake and shoddy wires, vendors often sell at low prices under the guise of cheap and good quality, so that people are fooled.

"Non-standard/enterprise/market national standard" and "resistance national standard"?

When many sales companies are asked whether it is a national standard cable, they often hear words like "market national standard" and "resistance national standard", many people do not know enough, what do these vague words mean?

National standard: The cable is used for electrification, and the resistance value of the conductor directly affects the conductive performance. If the conductor resistance is too large, the conductive performance is poor, and a large amount of heat will be generated when a large current passes through, which will cause a fire. At the same time due to the large resistance will also generate heat and do nothing to consume electricity.

Resistance protection cable is to ensure that the resistance value of the cable is in line with national standards, but it does not guarantee that the composition of the cable is produced in full accordance with national standards, such as the square number of conductors, insulation, sheathing and so on. To put it bluntly, that is, manufacturers through a variety of technological innovation (or means) in the premise of reducing the cost of materials, so that the cable to achieve safe use conditions.

Qingdao Tianxing Cable Co., Ltd. is a technology enterprise specializing in the production of wire and cable in Shandong Province, with more than 150 sets of domestic excellent cable production equipment and testing equipment, excellent production technology, modern testing equipment, to ensure stable product quality and timely supply. The company's main products are power cable, mineral cable, high life wire and cable, radiation crosslinked cable, control cable, computer cable, photovoltaic cable, communication cable, data cable, low smoke halogen free cable, flame retardant series wire and cable.