How to choose the right wire and cable?

Manufacturers of counterfeit and inferior wires and cables are disregarding the interests of consumers in order to obtain profits, and mass production of inferior wire and cable products, disrupting the wire and cable market, and damaging the interests of customers. Therefore, the correct choice of wire and cable is very important, what kind of product is in line with national standards?

First, the characteristics of wire and cable products that meet the requirements of national standards

First, there is the "CCC" certification mark. Wire and cable products have a close relationship with the lives of consumers. Its quality, safety and safety directly affect the safety of people and property of consumers. Therefore, wire and cable products are national compulsory safety certification products. All production enterprises must obtain the "CCC" certification from the China Electrotechnical Products Certification Committee, obtain the "CCC" certification mark, and have the "CCC" certification mark on the certificate or product.

Second, the packaging is beautiful. The packaging of wire and cable products is the same as other products. All large and medium-sized formal enterprises that produce products that meet the requirements of the national standards, the production of wire and cable is very focused on product packaging.

Third, the product has a smooth, round appearance with uniform color. The wire and cable enterprises whose products meet the requirements of the national standards shall strictly control the purchase of raw materials, production equipment, and production techniques in order to improve product quality and ensure that the products meet the requirements of the national standards. Therefore, the appearance of the wire and cable products produced meets the requirements of the standard: smooth and round, uniform in color. The appearance of counterfeit and inferior products is rough and dull. For the rubber-insulated flexible cable, the appearance is required to be round and the sheath, insulation, and conductor are not easily peeled off. The counterfeit and inferior products have rough appearance, large ovality, and low insulation strength of the sheath, and can be removed by hand. Fourth, the conductor is shiny, and the DC resistance and the conductor structure size meet the requirements of the national standards. The products of wire and cable that meet the requirements of national standards, whether aluminum conductors or copper conductors, are brighter and free of oil. The DC resistance of conductors is in full compliance with national standards, and it has good electrical conductivity and high safety.

Fifth, the length is accurate. The length is the main intuitive method of distinguishing between the requirements of national standards and counterfeiting of inferior products. The length of wire and cable products complying with the requirements of the national standards is in line with the national standard of 100±0.5m (that is, 100m as the standard, with an allowable error of 0.5m) to protect the interests of consumers.

Sixth, the certification mark is clear. The wire and cable product certificate that meets the requirements of the national standard is printed clearly. The “CCC” certification mark, trademark, model specification, rated voltage, length, inspection, manufacturing date, certification number, implementation standard, factory name, site, telephone, etc. Clearly, and in line with the product, there are other companies on the certificate marked "to warn the user" and other content, so that the majority of consumers to purchase and install correctly.

Second, the correct selection of wire and cable products in line with national standards

First of all, recognize the certification mark. When purchasing, be sure to check whether there is a "CCC" certification mark on the certificate, and if the specifications of the model, rated voltage, length, manufacturing date, certification number, inspection, implementation standards, factory name, and site address are clear.

Second, pay attention to packaging. When purchasing, please pay attention to the exquisite packaging, the printing should be clear, and the model specifications, the name of the factory, and the site should be complete. Third, check the appearance of the product. When purchasing, pay attention to look smooth, round, uniform color, feel good. In the case of rubber-type wire and cable, the sheath and insulation may be burned with a cigarette butt and the surface is completely free of damage.

Fourth, check the conductor. The conductor must have a certain degree of gloss and moderate flexibility, and the size of the conductor structure must meet the requirements of the national standard.

Fifth, check the length. When purchasing, do not try to cheap, buy 90m or 80m, or even no length of the wire and cable, the length must meet the 100 ± 0.5m standard requirements.

At present, in the wire and cable sales market, some manufacturers have misdirected consumers in order to attract users. They have disregarded products of the national standard product standard at 100 meters per turn, and manufactured products (especially plastic wires) at 90 meters, damaging the interests of consumers. , disrupted the wire and cable sales market. Why do these manufacturers make the product 90 meters in sales? The reason is that it is 10 meters less, lowering prices and misleading consumers. For example, PVC insulated copper core plastic wire BV2.5 produced by a wire factory

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NSK manufacture a full range of deep groove ball bearings. These bearings are the most common type and are used in a wide variety of applications.

Single-Row Deep Groove Ball Bearings
Pressed Steel Cages
Single-row deep groove ball bearings are the most common type of rolling bearings. Their use is very widespread.
In addition to open type bearings, these bearings often have steel shields or rubber seals installed on one or both sides and are prelubricated with grease. Also, snap rings are sometimes used on the periphery. As to cages, pressed steel ones are the most common.
For big deep groove ball bearings, machined brass cages are used.
Machined cages are also used for high speed applications.

Extra Small Ball Bearings and Miniature Ball Bearings
Miniature and instrument ball bearings can be divided into two basic types, deep groove and angular contact. The first (deep groove) can be further divided into the following five classes depending on their design details:

Standard type
Flanged outer ring
Extended inner ring
Expanded type in which one ring has a radial thickness that is larger than normal compared with the bearing width.
Thin section type in which both rings are extra thin in the radial direction. They can also be classified as: open, shielded, or sealed.
Maximum-Type Ball Bearings
Maximum-Type ball Bearings contain a larger number of balls than normal deep groove ball bearings because of filling slots in the inner and outer rings. Because of their filling slots, they are not suitable for applications with high axial loads. types of bearings have boundary dimensions equal to those of single-row deep groove ball bearings of Series 6200 and 6300 respectively. Besides the open type, ZZ type shielded bearings are also available. When using these bearings, it is important for the filling slot in the outer ring to be outside of the loaded zone as much as possible. Their cages are pressed steel.

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