Recently, the Consumer Protection Committee of Chongqing Municipality on the market of 38 groups of civil wires were tested, of which there are 28 qualified group, the group of 8 failed, two groups were identified as counterfeit products, and another two groups were seriously unqualified , Due to contact the manufacturer, suspected of being counterfeit products. Xu Jing, secretary general of Chongqing Municipal Committee, said that single-core hard-copper wire is widely used in the home improvement industry and is the most common wire for fixed wiring. 2.5mm2 specifications for this kind of wire in the home decoration is mainly used for lighting and general household appliances, the price range from tens to hundreds, as mainly used for concealed projects, its safety performance is particularly important. In order to provide consumers with real information about the quality of such products, to better guide their purchase, Chongqing City Council deliberately made a comparative test. Comparison of test samples for the Chongqing Municipal Consumer Council staff as an ordinary consumer identity, respectively, in the Chen Jiaping Electrical Market and Yuzhou Trading City purchased 60227IECO1 (BV) 2.5 mm2 civilian wires, a total of 38 brands, the products involved in Chongqing, Sichuan, Tianjin, Guangdong and other 4 provinces and cities manufacturing enterprises. The two brands of "Jianye" (Jianye Cable Group Co., Ltd.) and "Diyuan" (Chongqing Tianyu Wire and Cable Co., Ltd.) were identified as counterfeit products by the manufacturers and were therefore not tested in this comparative test. In addition, the comparison test results appear serious quality problems, "Yu Lung" (Chongqing Yu Long Wire and Cable Co., Ltd.) and "Yu Lin" (Chongqing Yu Lin Wire and Cable Co., Ltd.) two brands, the city Council After many parties did not find contact with the manufacturer, suspected fake and shoddy products. The comparative test commissioned Chongqing electronic electrical goods for Quality Supervision and Inspection Station based GB / T5023-2008 "rated voltage of 450 / 750V and below PVC insulated cables" test, test items directed at 20 ℃ conductor resistance, insulation thickness, insulation The thinnest point thickness, the size, the tensile strength before insulation aging, the insulation elongation before fracture elongation six indicators. A total of 36 brands tested, of which 28 were qualified, 8 failed, a pass rate of 78%. The main issues at 20 ℃ when the conductor resistance and insulation aging before the two indicators of tensile strength. According to experts, the conductor resistance at 20 ℃ is an important indicator of national standards assessment, reflecting the strength of wire and cable conductivity, failure performance is mainly measured values ​​greater than the standard value, that is, manufacturers in order to save costs using a poor Of the copper material or greatly reduce the actual cross-sectional area, the conductor resistance failure will not only increase the current loss in the line through the time, waste of energy, while working under overload will cause the conductor exacerbated fever, accelerate the aging of the conductor insulation, resulting in power supply Line leakage, bringing the environment and personal danger. According to the standard 20 ℃ when the standard conductor resistance should be ≤ 7.41Ω / km, the test results of seven brands do not meet the standards are: "to Le" (Chongqing Jiane Cable Co., Ltd.) 7.85, "Yu Lin" (Chongqing Chongqing YuLin Wire & Cable Co., Ltd.) was 32.82, "Changhe" (Chongqing Changhe Cable Co., Ltd.) was 7.78, "YuLong" (Chongqing YuLong Wire & Cable Co., Ltd.) was 34.25, "ChiNiu" Cable Co., Ltd.) was 11.23, Guangfeng (Shaofei Guangfeng Wire Factory) was 11.6, Hongshi Tong (Chongqing Hongshi Tong Wire & Cable Co., Ltd.) was 8.15. Insulation thickness and insulation thickness of the thinnest, the main assessment of the insulation thickness of the enterprise used to meet the standard requirements, followed by the production process, if not easy to make the cable in the installation, the use of damaged, the occurrence of leakage accident. According to the standard insulation thickness should be ≥ 0.8mm, the thickness of the thinnest insulation should be ≥ 0.62mm, the two test items are tested in all brands. Dimensions, wire and cable product standards on the insulation, the thickness of the sheath and the cable outer diameter and outer dimensions are strictly regulated. During construction, wires and cables will be laid into some pipelines. The pipe diameter and the outer diameter of the wire and cable should be matched. If the outer diameter of the wire and cable is too large, it will affect the construction quality. According to the standard diameter should be between 3.2-3.9mm, all items of this test items are tested. Tensile strength before insulation aging, reflecting the business in the production process, the use of raw materials there is a problem, the potential hazard is the use of wire and cable prone to insulation or sheath rupture, conductor leakage and other hazards. According to the standard insulation aging tensile strength should be ≥ 12.5N / mm2, the test results in five brands failed, namely: Yu Lin (Chongqing Yu Lin Wire and Cable Co., Ltd.) 10.1 N / mm2, Tianjin into City Jincheng Wire & Cable Co., Ltd.) was 11.9 N / mm2, Yulu Long (Chongqing Yu Long Wire and Cable Co., Ltd.) was 7.2 N / mm2, and Zhixiu (Chongqing Jin Niu Cable Co., Ltd.) Feng (Shapingba Guangfeng Wire Factory) is 9.5 N / mm2. Insulation before aging elongation at break, reflecting the business in the production process, the use of raw materials whether there is a problem, the potential hazard is the wire and cable prone to use in the insulation or sheath rupture, conductor leakage hazards. According to the standard insulation aging before elongation at break should be ≥ 125%, the test items more brands reached 200%. The results of this comparative test show that the safety performance of most 60227IEC01 (BV) 2.5mm2 wires sold in the market is up to standard, but there is also a small number of products that have potential safety issues. Chongqing Municipal Council suggested that the competent departments should strengthen supervision and control, strengthen the internal construction of production, personnel training, standardize the production process. Technical departments to further study the standard, guide the production sector in accordance with the requirements of the standard production, and regular confirmation test, routine test. Do a good job of checking the key raw materials, such as copper wire, insulation materials.