99国产精品中文字幕在线观看_日韩精品在线一区_亚洲欧美另类在线30p_无码人妻丰满熟妇区av_理论片国产台湾在线_国产精品观看视频免费完整版_边做边爱mp3在线播放免费观看_扑克牌又疼又叫全程_伊人久久精品九九热_强壮公撩开我的裙子

The competition in the wire and cable products market is becoming more and more fierce. Many merchants choose to shoddy and have a certain degree of competitiveness in the market price. So what is the method for identifying high-quality cables? When purchasing wire and cable, the method of identification is as follows:

1. Look at the appearance first. The product has a smooth and round appearance and a uniform color. Wire and cable enterprises that meet the requirements of national standards, in order to improve product quality, to ensure that products meet the requirements of national standards, in the raw material purchase, production equipment, production processes and other aspects of strict control. Therefore, the appearance of the produced wire and cable products meets the standard requirements, smooth and round, and uniform in color. The fake and shoddy products have a rough and dull appearance. For the rubber insulated flexible cable, the appearance is required to be round, and the sheath, the insulation, and the conductor are not easily peeled off. The fake and shoddy products have a rough appearance, a large ovality, and a low insulation strength of the sheath, which can be torn by hand.

2. Look at the certificate inspection report. Wire and cable has always been listed as the focus of government supervision and inspection, and regular manufacturers are subject to inspection by the supervision department on a periodic basis. Therefore, the seller should be able to provide the inspection report of the quality inspection department. Otherwise, the quality of the wire and cable products will be lack of basis.

3. Look at the packaging. For regular enterprises that produce products that meet national standards, wire and cable are produced with great attention to product packaging. When purchasing, pay attention to the beautiful packaging, the printing should be clear, the model specifications, the factory name, and the meter standard are complete.

4. Look at the conductor. The conductor is shiny, and the DC resistance and conductor structure size meet the requirements of national standards. Wire and cable products that meet the requirements of national standards, whether it is aluminum conductor or copper conductor, are bright and oil-free. Therefore, the DC resistance of the conductor is in full compliance with national standards, with good electrical conductivity and high safety.

The above is the identification method for ordinary cables, which is not suitable for special cables. According to its performance, special cables are very different from ordinary cables in terms of appearance, packaging, conductors and other processes. The specific special cable can only be identified according to its performance.