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: 亚洲精品一线二线在线播放 | 日韩中文字幕成人免费视频 | 亚洲av片毛片成人观看兔费 | 男女激情视频国产免费观看 | 免费亚洲一区二区 | 欧亚精品卡一卡二卡三 | 日日拍夜夜嗷嗷叫国产 | 春色伊人网 | 男男无码sm调教gv资源 | 亚洲国产一区精品 | 性生交大片免费看图片 | 337P日本欧洲亚洲大胆 | 日本强伦片中文字幕免费看 | 99久久综合国产精品二区 | 艳母1-6在线播放 | 国产高潮流白浆啊免费A片动态 | 久久中文av | 亚洲va在线视频 | av在现观看 | 日韩一三区| 欧美精品在线观看一区 | 亚洲成人毛片 | 一区二区三区免费观看视频 | 久久超碰极品视觉盛宴 | 欧美最猛黑人xxxx黑人猛叫黄 | www黄色免费 | 中文字幕久久精品波多野结百度 | 嗯啊久久 | 成人网中文字幕 | 国产成人精品日本亚洲网站 | 欧美人与动人物姣配XXXX | 中文字幕视频在线看 | 91欧美视频在线 | 久久久久99精品久久久久 | 91麻豆久久| 久久99影视 | 76少妇精品导航 | 日本高清网 | 国产69精品久久久久乱码韩国 | 久久精品成人免费国产 | a级片免费在线 |