女人张开腿让男桶喷水高潮_国内精品免费一区二区2001_日韩综合在线播放_麻豆在网站1区_欧美日韩在线视频首页_天天狠天天天天透在线

sales@zmscable.com

How to identify inferior wires and cables

2 years ago 2016 0 News

1672880416361470.png


Identification of Poor-Quality Wire and Cable Methods Introduced


Wire and cable is the main carrier of power transmission, and their use range is extremely wide, especially in the “city network, rural network” transformation, and new construction projects. 

Do the following analysis and identification of some inferior products.

According to reports, inferior wires have great harm. 

The first is the low-security performance. 

The insulation layer with many wires is not made of regular insulating plastic but is made of recycled plastic. 

The insulation layer can be peeled off by peeling off, which is easy to cause the insulation layer to be broken by the current leakage. 

Life safety poses a great threat. 


Secondly, the thickness of the conductive inner conductor determines the load of the wire on the current. 

The larger the current, the thicker the conductive core is required. 

During the inspection, it was found that the actual cross-section of the core of many wires is much smaller than the size indicated. 


For example, many wires are said to have a core section of 4 square millimeters, but only 2.5 square millimeters are measured, and some even have 1.5 square millimeters. 

When consumers use this product, it will cause excessive resistance to heat and cause an electrical fire hazard.


There are several tips for identifying inferior insulated wires:


(1) Look at the printed words on the label and the insulation skin. 

If there are typos or the printing is different in-depth and the typeface is ambiguous, attention should be paid.

(2) Using the fingers to insulate the outer skin, some inferior insulated wire sheaths are easy to fade, especially in the red line. 

This problem is caused by the color of the lines on the fingers or the words on the printed lines. 

The general is inferior quality.

(3) Using nails to cut and smash the outer skin, it is generally inferior lines that can be drawn down and smashed down.

(4) Repeatedly bending the insulated wire, the inferior wire insulation layer is generally poor in material, and the insulation layer will be broken after bending 3 to 4 times.

(5) Lgnite the insulation layer, which is inferior to spontaneous combustion after leaving the open flame.

(6) Look at the core color, the inferior line color is gray and has no metallic luster.

(7) In the length of the package, generally 100 meters per tie or circle, the national allowable error is ±0.5%, and the length of the inferior wire is only 95 meters, or even less.

Some are misleading in the package on the basis of "code".

(8) If it is still undetermined by the above seven methods, it is also possible to measure the outer diameter of the insulated wire and the core diameter. 

The measured values differ greatly, basically the inferior insulated wires.

(NOTE: There are many bad manufacturers at present, the conductors do not have enough cross-section, Increase the thickness of the insulation or sheath to reach the entire outer diameter of the wire to deceive the user).


Tags:
power wire
INQUIRY
主站蜘蛛池模板: 精品少妇一区二区三区视频免付费 | 日韩国产欧美在线观看 | 国产精品久久久久久精 | 成人国产网站 | 国产精品白浆在线观看无码专区 | 男人的天堂Aⅴ在线无码 | 久久AV无码精品人妻系列试探 | 国产成人女人在线观看 | 免费无码又爽又刺激高潮的视频 | 一区二区不卡av | 97成人资源站 | 清纯国语对白videoshdcom 超碰狠狠干 | 精品一区二区久久久久 | 亚洲成人国产综合 | 欧美一码二码三码无码 | 亚洲春色Aⅴ无码专区在线播放 | 成人黄色小说网 | 蜜桃视频成人在线观看 | 国产午夜福利片1000无码 | 亚洲人成人一区二区三区 | 日韩在线一区视频 | 国产精品无码久久AⅤ人妖 秋霞av国产精品一区 | 苍井空毛片精品久久久 | 蜜臀亚洲AV无码之国产精品 | 亚洲真人无码永久在线 | a中文字幕www| 乱人伦中文字幕无码 | 最新日韩欧美在线综合网 | 性一级片 | 成人91在线 | 一本色道久久88亚洲精品综合 | 久久99国产精品二区 | 国产成人综合视频在线 | 国产精品久久久久久久久婷婷 | 一本岛道一二三不卡区 | 色99之美女主播在线视频 | 亚洲一二三精品 | av无限看 | 亚洲AV人无码综合在线观看 | 国产一级片免费视频 | 豪放女大兵在线 |