Wire and cable is one of the important products involving personal property safety. Inferior wire and cable is not only a large number of consuming countries with limited energy, but also pose a threat to the safety of life and property of the people. Shenzhen as an important production base of the national electric wire electric cable, after years of regulatory quality supervision department, wire and cable quality relative to the similar products in China has been in a higher level, but there are still a small number of enterprises to reduce costs, the pursuit of profits, inferior quality of the products, wire and cable products quality level is not high. In order to further improve the quality of the wire and cable products in zhuhai level, enhance the competitiveness of the wire and cable products in our city, in the second quarter of this year, the city pledges inspect bureau organized the wire and cable products quality supervision and spot checks in the whole city, 44 selectiving examination batch products, qualified 28 batch, percent of pass is 63.6%. Unqualified 16 batch, percent of pass is 36.4%. Test results also show that the spot check of wire and cable conductor resistance rate is higher, and polyvinyl chloride (PVC) or rubber and sheath structure size or mechanical level needs to improve the quality of performance.
The spot check in accordance with the relevant national standards, involving personal safety conductor resistance, insulation thickness, insulation thickness of the thinnest point, tensile strength and so on has carried on the inspection before aging. The spot check, the city quality of wire and cable products has the following features:
Conductor resistance qualified rate is higher. Copper wires are an important part of the wire and cable, conductor resistance is a important index of the current-carrying capacity to measure wire. The relevant regulations of the state, made clear that the copper wires in wire and cable should use electrolytic copper, in the production enterprise in selectiving examination 44 batch samples, there are 40 batch qualified conductor resistance, percent of pass is 90.9%. Unqualified samples 4, expert analysis, the reason of the unqualified, sectional area reduces and the use of inferior copper. Conductor resistance is unqualified, can lead to severe fever in wire and cable in use process, accelerate the insulation aging, is a major fire hazards such as fire accident.
Polyvinyl chloride (PVC) or rubber and sheath structure size or mechanical performance of the quality level to be improved. The role of wire and cable insulation and sheath layer is insulated to prevent electric shock effect and to protect copper conductor to prevent corrosion and damage. National standards for polyvinyl chloride (PVC) or rubber and sheath should have certain thickness and the mechanical properties (tensile strength and elongation at break). The production enterprise random samples of 10 batches of samples of polyvinyl chloride (PVC) or rubber and sheath structure size or mechanical performance is unqualified, not qualified rate of nearly 23%. Lead to the project of the main causes of unqualified has the following two points: one is to use reworked material production, to reduce costs; Wire and cable the insulation material should be used to meet the requirement of national standard APS plastic, prevent leakage to ensure security role insulation, if use the recycled plastic or impurities in high material made of wire, the tensile strength and elongation at break can not meet the standard requirements. Insulator rupture, appear easily when installation, make electric conductor naked. Second, technical ability is insufficient, process control is bad. Some old wire and cable factory production equipment, production of wire and cable insulation layer thickness, with the using time or weathered, insulator rupture, conductor, easy to get an electric shock risk, short circuit, power outages, damage the worst effects of the electrical equipment. For the supervision and spot checks a result, the city pledges inspect bureau adopted different measures according to different situations, to production does not conform to safeguard human health and the national standards, industry standards of personal and property safety of the poor quality of wire and cable companies, according to "product quality law" shall be serious punishment; Unqualified shall be ordered to wire and cable manufacturing enterprise, make corrections within a time limit After rectification for unqualified cable products, arrange tracking supervision and spot check, the result of the supervision and inspection on two consecutive unqualified wire and cable manufacturing enterprises, submit to the relevant departments shall be revoked the certificate of the 3 c authentication; The electric wire electric cable quality treatment conference, to strengthen the technical support of manufacturing enterprises and stable cross of laws and regulations and relevant standards. At the same time, the city pledges inspect bureau related staff said, learned to buy wire.
Consumers to buy qualified wire and cable, should pay attention to the following questions:
A, check authentication marks. Compulsory certification of products, should be prominently labeled with certification in products, namely "CCC" logo, otherwise, is the unlicensed products.
Second, see inspection report. Wire and cable as affect personal and property safety of the product, has been listed as key government supervision and inspection, regular manufacturers according to the periodic supervision department to accept inspections. Therefore, the seller should be able to provide the quality inspection department inspection report, otherwise, the product quality is the lack of the basis.
Third, detection of insulation and sheath. Insulation and sheath thickness should be uniform without deflection, feel is should have obvious tension and elongation. At the same time, the surface of the insulation and sheath should be continuous printing marks, name of manufacturer, type of product symbol interval: insulation does not exceed 200 mm, sheath less than 500 mm.
Fourth, observation lines smooth finish and color. Wire and cable conductor of copper metallized or metallized annealed copper wire, aluminum conductor for aluminum or aluminum alloy wire, smooth surface, copper conductors are pale purple, aluminum conductor is silvery white, otherwise, the conductor may be mixed with other impurities, causing the conductive ability decline.
Five, the dc resistance measurement. To ensure that the purchased electric wire electric cable quality qualification, can be the first to buy product cut 3 ~ 5 meters to test the dc resistance measurement.
Six, length. National standard for wire and cable shall be specified delivery length, into the lap length should be 100 m, length should be greater than 100 m in coil, consumer can according to the label length is measured, its length standard error less than 0.5% of the total length, if can not meet the prescribed standards lower limit is not qualified.
