How to tell if the wire is made of high quality copper?

1.Look at the appearance of the wires.

This includes the packaging of the wire, as well as the appearance of the wire insulation.

The wire is packaged with all the parameters of the wire, the certificate of conformity and the standards implemented. Then look at the insulation logo of the wire, there should be a clear mark on the outside of the insulation layer, including the manufacturer's marking, the model of the wire diameter and so on.

All wires with vague logos are certainly not a qualified product.

2.Look at the wire diameter of the wire.

Check the copper core of the wire, which is the core. Because there are actually two points in the bad of a wire, one is the insulation layer, and the other is the core of the wire.

We can strip the wire out a section until the copper inside is exposed. If we find that this copper wire is purple, the quality is good;In addition, we can also bend the copper wire with our hands, if it feels soft, it means that it is a good wire. In turn, we found that the copper wire was yellow, then it was brass, and there were other impurities in it, and the quality was not good;

In addition, when we bend the copper wire, if we feel that the copper wire is very hard, then it means that this wire is an inferior wire.

3.Detect the resistance performance.

This kind of wire is required to be flame retardant, the fire performance is very high, take a piece of wire, and then we use a lighter to light it, and then extinguish the lighter. At this time, let's observe whether the insulation layer of the wire will automatically extinguish, if it is extinguished, then it means that it is flame retardant and qualified;If it is not extinguished, then it is a substandard product.

It mainly depends on the color of the copper core, and the copper content of the real red copper (red copper) is as high as above, and the color is red and rose-red. Wire copper core ranking: copper, brass, aluminum-clad copper.

If you don't know how to distinguish, you can directly buy your own brand of wire, such as the pigeon brand wire core material is very high-quality.

Manually distinguish whether the wire is made of high-quality copper, you can use the color of the copper core, the more purple-red it tends to be high-quality.

As long as you look at the surface of the copper layer, and the luster, brightness, and durability, that is, the high-quality copper content of Lanzhou is broken.

I can make some answers to this question.

Weighing instructions: *** wires, generally within the specified weight range. For example, the commonly used plastic insulated single-strand copper core wire with a cross-sectional area is worth ;The plastic insulated single-strand copper core wire weighs 3 per 100m;of plastic absolutely.

To see: to see whether there is a quality system certificate; See whether the certificate is standardized; See whether there is a factory name, a factory address, a sacred mountain, an inspection seal, and a production date; See if there are trademarks, specifications, voltages, etc. printed on the wires. It is also necessary to look at the cross-section of the copper core of the wire, and the color of the copper is bright and soft, otherwise it is a defective product.

First, it is necessary to see whether there is a quality system certification; See whether the certificate is standardized; See whether there is a factory name, factory address, inspection virtual core section, production date; See if there are trademarks, specifications, voltages, etc. printed on the wire. The family also has to look at the cross-section of the copper core of the wire, which is an excellent product.

Generally, the wire is made of brass, but there is also a kind of copper, but the copper impurities are not suitable for the inner core of the cable.

To identify what kind of copper wire is made, the method will also file the gallbladder is not impressed by the color, and the identification method is very simple:

1. Take a section of wire core (single wire) and knead it in your hand to see if it is soft (this method depends on the ductility of copper).

2. Take a piece of white paper and wipe the core vigorously to see if there are black marks or stains on the white paper (this method sees whether there are too many impurities, and if it is dirty, it is too much impurities).

3. If you are too lazy to look at it yourself, or if you really have no conditions to identify it yourself, there is another trick: ask the manufacturer to sign a quality assurance certificate to ensure the quality of the wire core (resistivity and square number) It doesn't matter if you don't know what the resistivity should be, just say "national standard". Stamped with their official seal.

The conditions for unqualified quality are harsh. Generally, those who do not meet the quality standards dare not make such promises.

It's copper, it's aluminum, it's burned, it's iron, it doesn't change color, it turns red!

The best way: cut 1 meter of wire, use a resistance meter to determine the resistance value, the lower the resistance, the better, the resistance greater than a certain value of the wire is counterfeit and shoddy products. If the resistance is seriously exceeded, there will be a very big danger.

Resistivity at 20 degrees: copper ohm2mm², aluminum ohm2mm². The resistance value of the copper core wire is related to the ambient temperature, and the resistance value = resistivity * wire length and wire cross-sectional area.

3. Wire length and cross-section identification method.

Be sure to see if the length and core thickness are done with hands and feet. In the relevant standards, the error of the length of the wire can not exceed 5%, and the cross-sectional wire diameter can not be exceeded, but there are a large number of short catties in the market, and there is fraud in the cross-section (such as the line with a cross-section of 6 square millimeters, but in fact it is only 4 5 square millimeters thick). There is a minimum value for the diameter of the copper core of each specification of the wire, if it is too small, it may be a counterfeit product, especially some wires with a large diameter of outer plastic and a small copper core, which are most likely to be counterfeit and shoddy products.

Fourth, the color identification method of copper core.

The quality of the copper wire depends on the color, the good copper wire is purple, and the copper wire can be scraped with a knife. The copper core is reddish in yellow, indicating that the quality of the copper used is good, while the whitish yellowing in the yellow is a reaction of low-quality copper. For aluminum core wires, the regular ones must be shiny, flashing silver-white light in the light, while those that are dark and look dark are not of good quality.

5. Toughness identification method.

Bend the wire by hand to test its toughness. Good wire toughness is good, can be bent well, some unqualified wires bend a few times and its insulation layer has been broken, and even some can be peeled off directly by hand. The softer ones are better, and the ones that will rebound are of inferior quality.

6. Insulating layer identification method.

Intercept a section of insulation to see if the core is in the middle of the insulation. Not centered is due to the process is not high caused by the core phenomenon, in the use of small power can also be peaceful, once the power consumption, the thinner side is likely to be broken down by the current. Look at the quality of the insulation layer, break it by hand, if it is easy to break the skin, this quality is poor.

The copper content is determined by measuring the resistivity. Specifically, make or buy a tooling, snap the line on, and measure its resistance with a double-ratio bridge. By means of the length and cross-section, its resistivity is calculated.

In the case of copper plates, the resistivity can be measured directly with a conductivity tester.

It can be judged from the following aspects:

Appearance: The high-quality wire is well-manufactured, the thickness of the outer insulation layer is uniform and moderate, the flammability is poor when ignited with an open flame, and it will self-extinguish without spontaneous combustion after leaving the open flame.

Material: The core of the high-quality wire is made of electrical oxygen-free copper, the color is similar to bronze, the quality is soft and has good winding, the color is bright and solderable.

Specifications: The cross-section of high-quality wire should meet the national standard, the calculation formula for the cross-section of a single-core wire is r (the square of the radius of the radius), and the cross-section of a multi-core wire is the number of cores of a single-core cross-section.