June 23, 2023
On March 23, a house surnamed Zhang in Xingming Zhang Village, Xiangcheng City caught fire due to a short circuit in wires. The roof collapsed, and furniture and household appliances turned into ashes;
On May 26, a house in Yangwang Village, Tianhe Township, Gaotai Township, Meitang County caught fire due to a short circuit in wires, and house burned to ground;
On June 10, a fire broke out in house of a resident of Chenzhuang Village, Zhancheng Township, due to a short circuit in wires. Fortunately, there were no casualties;
According to available information, in recent years, more than half of electric fires in our country were caused by power lines, and most of them were caused by installation of fake and low-quality wires.
Fake and low-quality wires not only violate rights of ordinary manufacturers, but also cause damage to power lines, electricity leaks, fires and other undesirable phenomena that threaten our personal safety.
How to distinguish authenticity of wire?
1. Look at packaging
There are marks on insulating layer of real wires, such as wire specifications and models, 3C certification, etc., and writing is clear. The electric coil has a certificate of conformity, which indicates address and phone number of manufacturer, 3C logo, quality system certification, voltage, characteristics of wire model, etc. On false line, none or absent. When buying, it is recommended to go to a regular shopping center.
2,burn with fire
Fake wires burn quickly from open flames and smoke when exposed to fire. Real wire burns slowly, with virtually no smoke and no open flames.
3. Notice color of copper core
The higher brightness of copper, better quality of copper, and brightness is uniform, shiny and no layers. The copper core of qualified wire should be fuchsia, shiny and soft to touch.
If you can cut off a small section of plastic sheath, carefully examine copper wire inside and lightly touch top of copper wire with your palm.
The copper core of fake and poor quality copper core is purple-black, yellowish or white, with many impurities, low mechanical strength and poor toughness. It will break with little force, and there are often breaks in wire.
When inspecting, you only need to remove wire 2 cm from one end, and then rub a piece of white paper on copper strand. If there is a black substance on white paper, it means that it has more impurities. copper core. Additional, insulation layer of false and defective electric wire looks very thick, mainly made of recycled plastic, time is growing, insulation layer meets aging and electricity leakage.
There is no requirement to grind rice in country, but many producers also grind rice, and milled rice is not necessarily national standard. Irregular rice chop is just a remedy, and length of national standard line is usually 100 meters.
Good quality wires and cables are usually within specified weight range per 100m.
Remove sheath, shield, insulation and other materials, remove any of wires, measure length with a tape measure and weigh it on an electronic scale with an accuracy of 0.01 g. According to density of various materials. (copper 8.92g/cm3, aluminum 2.70g/cm3) Calculate wire cross-sectional area, if negative deviation between calculated area and marked area exceeds 10%, it can be initially judged as a poor quality product.
It is recommended to repeatedly bend wire head by hand. The best are those that have soft hands, good resistance to fatigue, high elasticity of plastic or rubber, and no cracks in wire insulator.
When buying wires, keep your eyes peeled and don't be greedy on cheap, because safety is no small matter. If you find that someone is selling fake and low quality wires, please call police as soon as possible so that there is nowhere for fakes to hide.