How to identify the quality of wires? Identify the quality of the wire?

The coarse quality of the copper wire or copper core in the wire is a little better, and the thin one is poor, if the current is too large, it will cause the wire to heat up, that is to say, the wire copper wire or copper core is too thin! The poor quality is that there are few or thin copper wires or copper cores inside!

Measure the cross-sectional size of the wire and the energizing test. Oh.

It depends on whether there is a quality system certification; See whether the certificate is standardized; See whether there is the factory name, factory address, inspection seal, and 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, the color of the high-grade copper is bright and the color is soft, otherwise it is a defective product.

To try. You can take a wire head and bend it repeatedly by hand, where it feels soft, has good fatigue strength, plastic or rubber feels elastic and there is no crack on the wire insulator is an excellent product.

Weighing. wires, which 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 5 mm2 weighs 1 8 1 9 kg per 100 m; 2 5 mm2 plastic insulated single-strand copper core wire, weighing 2 8 3 0 kg per 100 m; 4 0 mm2 plastic insulated single-strand copper core wire, weighing 4 1 4 2 kg per 100 m, etc.

Poor quality wires are not weighted enough, either the length of the pin is not enough, or the copper core of the wire has too many impurities.

Look at the copper. Qualified copper core wire copper core should be purple-red, shiny, and soft to the touch. The shoddy copper core is purple-black, yellowish or white, with many impurities, poor mechanical strength, poor toughness, and a little force will break the world, and there is often a broken wire in the wire.

When inspecting, you only need to peel off one end of the wire 2 cm, and then use a piece of white paper to rub it slightly on the copper core, if there is a black substance on the white paper, it means that there are more impurities in the copper core. In addition, the insulation layer of shoddy wires may seem to be very thick, but in fact most of them are made of recycled plastic, and over time, the insulation layer will deteriorate and leak.

See**. Due to the low production cost of counterfeit and shoddy electric spring bucket limb wire, therefore, when sellers, they often sell at low prices under the guise of low prices and good quality, so that people are deceived.

In a simple way, the quality of the wire can be judged by the insulation! The rubber on the outside of the wire is the insulation layer of the wire. Its existence can not only prevent damage to the conductor caused by external factors (protection conductor), but also protect the external damage caused by the failure of the conductor (insulation, flame retardant).

To judge whether it is good or bad, the following three methods can generally be used:

1.Touch. Gently stroke the surface of the insulation layer with your hands, if the surface is rough, it proves that the production process of the insulation layer is poor, and it is easy to cause failures such as leakage.

If you press the insulation with your fingernails, if it can rebound quickly, it proves that the insulation layer has high thickness and good toughness.

2.Bend. Take a piece of wire, bend it back and forth several times, and then straighten the wire and observe.

If there are no traces on the surface of the wire, it proves that the wire has good toughness. If there is obvious indentation on the surface of the wire, severe whitishness, it proves that the toughness of the wire is poor. If buried in the ground for a long time, it is easy to age, brittle, and easy to leak electricity in the future.

3.Burn. Use a lighter to keep burning against the wire until it reaches the wire insulation**.

Then turn off the lighter and start the timer – if the wire can go off automatically within 5 seconds, it proves that the wire is flame retardant. Otherwise, it proves that the flame retardant capacity of the wire is not up to standard, and the circuit is overloaded or the circuit is easy to cause disasters.

Introduction: wire and cable used to transmit electric (magnetic) energy, information and realize the conversion of electromagnetic energy wire products, wire and cable in the broad sense is also referred to as cable, cable in the narrow sense refers to the insulated cable, which can be defined as: a collection composed of the following parts; One or more insulated cores, as well as their respective cladding, total and outer sheaths, which may destroy the sheath, may also have additional uninsulated conductors.

1. Check the shield networking

Is the number sufficient? Copper weaving net, check solderability, tinned copper computer wire scrape to see if it is copper wire, the hardness of aluminum-magnesium alloy wire is significantly greater than that of copper wire; The network is sparse, unevenly distributed, and the insulation layer is not tightly wrapped. Use a lighter to burn the core wire, if it is copper-clad aluminum, it is easy to see the inside'The color is not the same as the copper on the outside; Peel off the outer skin and look at the weaving angle of the shielding layer, if it is basically upright, then it can basically be seen that the weaving angle is larger, which is a cutting corner;

2. PVC sheath:

On the surface, you can see the regular "unevenness" of the braided mesh inside the compression, which indicates that the processing technology is good, and there will be no relative sliding, which is a good cable. The appearance is smooth, and the "unevenness" of the compressed braiding mesh can not be seen, and the sheath is loose when pinched by hand, which is a poor cable;

3. Check the adhesion force between the core wire and the insulating layer

Cut the insulating layer obliquely, pull the core wire according to the peeling direction, and see if the core wire and the insulating layer are stained with the process material; Good cables have a large sticking force, and poor cables do not have sticking;

4. Check the core:

Diameter - SYV cable, SYWV cable; Recently, there has been a kind of SYV75-5 core diameter cable, the characteristic impedance of this cable is certainly not 75 ohms, and it is not applied to 75 ohm transmission systems; Check the diameter of the inner core of the cable with vernier calipers;

5. Longitudinal tensile test:

Take one meter of security cable, peel off the core wire, insulation layer, shielding layer, and outer household cover, leaving 10 cm long each. The method is: hold the two adjacent layers of the cable with both hands and pull them in opposite directions; Good cables generally can't be pulled by force, and poor cables can be easily pulled out without much effort.

6. Open a coil of wire to measure the length, or use the method of weighing to roughly judge;

Solution

1. If the transmission distance is more than 800 meters, with SYV-75-5 cable, it turns out that there is no image or the image is jumping, you can use the visual closed car frequency amplification anti-jammer, which adopts the first segmented amplification method, which can amplify the first signal by 10 times, so that the transmission distance can be effectively extended (you can not use a simple amplifier, otherwise the signal loss is very large);

3. If you encounter the problem of cable soldering, it is recommended to buy pure tin welding wire, and use a high-power soldering iron for fast soldering, and must not be slowly tinned;

4. Finally, if you are not sure about the first cable, you can also use RF cable to transmit multi-channel signal equipment, and one RF cable can transmit 20 image and control signals at the same time. The transmission range of the fiber can reach 3 kilometers, so the cost will be more cost-effective.

Home decoration circuit transformation to buy the best wire, wire bad is directly related to the future home electricity safety, now the quality of wire products is uneven, many fake and shoddy products, pay attention to identification,So how do you look at the wire*** is not good? How to quickly distinguish the authenticity of a wire?Follow us to find out!

1. See whether there is a quality system certificate; See whether the certificate is standardized; See whether there is the factory name, factory address, inspection seal, and production date; See if there are trademarks, specifications, voltages, etc. printed on the wires. Also look at the cross-section of the copper core of the wire, the color of the high-grade copper is bright, the color is soft, and the copper core is yellow and reddish, indicating that the quality of the copper used is better, and the white in the yellow is the reaction of low-quality copper. Otherwise, it is defective.

2. You can take a wire head and bend it repeatedly by hand, where it feels soft, has good fatigue strength, plastic or rubber feels elastic and there is no crack on the wire insulator is an excellent product.

3. Intercept the insulation layer of a spring attack section to see whether its core is located in the middle of the insulation layer. 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 of Dansen orange is large, the thinner side is likely to be broken down by the current.

4. It is necessary to see whether the length and core thickness are done with hands and feet. In the relevant standards, it is stipulated that the error of the length of the wire cannot exceed 5%, and the diameter of the cross-section line cannot be exceeded.

5. In the process of purchasing, we should also pay attention to the brand, generally speaking, the big brands will also be strict about the quality of the products, resolutely do not buy three no products, and do not be lucky to be deceived by others and buy three no products, the quality of the wire is related to the safety of electricity in the future, remember not to be careless.

How do you look at the wire*** bad? How to quickly distinguish the authenticity of a wire

1. Look at the brand: brand ranking and value are the cornerstone of product quality and safety, and choosing a regular and well-known brand can avoid buying inferior products to a large extent. For example, as one of the top 500 Asian brands, one of the top 500 Chinese enterprises, and an enterprise with a brand value of 100 million yuan, Far Eastern Group has been operating with ingenuity for 38 years and has won the "National Quality Award" and has a good reputation.

2. Look at the product:

Packing: neat disc shape, good packaging, complete items on the certificate, including but not limited to trademark, factory name, factory address, **, specifications, cross-section, inspectors, etc.;

Inner core: choose copper material core with longer service life and safer, pure copper core is preferred, and the color is purple-red; In addition, it is also necessary to see whether the inner core is in the middle of the insulation wrap. Inferior wire rods have a large degree of eccentricity problems.

The eccentricity rate is high, and the thin part is easy to be broken down, which has the risk of causing a short circuit and causing fire;

Smoke: Use a lighter to burn the wire, the ordinary wire will release a toxic gas when it encounters an open flame, which will further increase the risk of short circuit and fire. When the flame retardant wire encounters an open flame, it will break off from the fire, and no toxic gas will be generated.

Therefore, it is more recommended that you install and use low-smoke halogen-free flame retardant wires, which are safer and more environmentally friendly;

Weight: The length of the national standard line, the general number of packages is marked as 100m, and the actual measurement is also full of meters and copper, with a certain weight.

The property right of general residential housing is 70 years, and the Far Eastern's "good core and high safety and environmental protection wire" can be used for 70 years, truly achieving a wiring and lifelong worry-free. In terms of appearance, the Far Eastern Group's "good series" wires are beautifully packaged, and the product certification information is complete; The raw material of the inner core is pure copper core, which has low resistivity, strong conductivity, energy saving and power saving, and achieves low eccentricity, high concentricity, anti-breakdown, and safer electricity consumption. The insulation layer is made of high-quality environmentally friendly PVC material insulation layer, which is more wear-resistant, corrosion-resistant, and age-resistant, and at the same time adds flame retardant, which has the characteristics of high-performance flame retardant, low smoke and halogen-free, non-toxic and harmless; The length of the national standard line standard is marked with 100 meters, and the actual length is 95-100 meters, and the Far East can ensure the length of 100 meters in this regard, which is better than the national standard, 3. Look at the strength, whether there are any buildings we are familiar with in the decoration of these materials, the choice of the Far East is the common choice with the Hong Kong-Zhuhai-Macao Bridge, China Zun and so on.

4. Looking at after-sales, one of the important factors that distinguish big brand wires from miscellaneous brands on the market is that there is a first-class guarantee that can be traced back to the whole process, which can effectively prevent consumers from buying counterfeit wires. Far Eastern Wire has a double after-sales guarantee, not only Pacific Insurance underwriting, 30 days no reason to return and exchange, each coil of wire packaging also has *** anti-counterfeiting protection, the whole process of traceability training, peace of mind.

1. Judge by weight. Good wire products, the weight is relatively uniform, that is, in a state of this fixed range. If the cross-sectional area of the line is flat, the weight of 100 meters is about kilograms.

A flat wire weighs about kilograms for 100 meters. For example, if the weight of 4 flat wires is about 100 meters, on the contrary, if the weight of the wire is insufficient, it means that the length is insufficient, and the impurity content may be too much.

2. Observe the quality of the conductor. Metal conductors are an important cost for wires, so some manufacturers will cut corners in this regard. A good wire uses a good copper core, which is purple-red, and the traces of defeat are bright and soft.

On the contrary, if the core of the wire is purple and black, yellowish, it is said that there are many impurities, the strength is insufficient, and it is easy to break if it is broken.

3. Observe product information. Then you can distinguish from the packaging of the wire, the good wire packaging is perfect, and the packaging has detailed product information. Such as the name of the manufacturer, the date of production, product specifications, trademark and voltage and other information, and the handwriting is legible.

On the contrary, if the wire is packaged casually and the product information is less, it is judged to be an inferior wire.

4. Observe the eccentricity of the wire. You can cut a section of the wire to see if the wire core is centered, a good wire core is centered, on the contrary, if the wire is eccentric, it means that the production level is low, once the power consumption is large, the thin surface is easy to breakdown.

5. The length of the wire and the thickness of the core. Finally, it is judged from the length of the wire and the thickness of the wire diameter. Good wire length and wire diameter are in line with national standards.

The length difference is not more than 2%, and the cross-section error is not more than 2%. On the contrary, if the wire package shows 100 meters, squared, and the actual measurement is only 90 meters, 2 square, it means that it is an inferior wire.