The new house has been renovated. Who can tell me what brand of thread to use? Quality is strictly guaranteed. Far East, Sun Hang, Cejin and Zheng Xing can do it! Special reminder: the national standard cable 100 m, and some non-standard cables are only 60-75 m or 80-95 m (100 m/disc): BV- 1.5 105 yuan/disc bv 2.5-/kloc-0. 20 10 May Price (GB wire manufacturer: O37L-637L2L5L589O6O2776 brand: Zhengxing manufacturer: Zhengzhou Sandian Co., Ltd.) How to distinguish the advantages and disadvantages of buying wires? (How to distinguish between national standard and non-national standard wires) First, look at whether there is a quality system certificate; See if the certificate is standardized; See if there is a factory name, address, inspection stamp and production date; See if there are any trademarks, specifications, voltages, etc. Printed on the wire. It also depends on the cross section of the copper core of the wire. Superior copper is bright and soft, otherwise it is inferior. Second, try. It is recommended to bend the end of the wire repeatedly by hand. All products with soft hand feel, good fatigue strength, elasticity in plastic or rubber, and no crack on conductor insulator are excellent products. Three times as heavy. High quality welding wire is usually within the specified weight range. For example, the common plastic insulated single-stranded copper conductor with a cross-sectional area of 1.5mm2, per 100 m weight1.8 ~1.9kg; 2.5mm2 plastic insulated single-stranded copper core wire, with a weight of 3 ~ 3 100 m1kg; The weight of 4.0mm2 plastic insulated single copper core wire is 4.4 ~ 4.6kg per100mm, and the poor quality wire has insufficient weight or length, or there are too many impurities in the copper core of the wire. Look at the copper. Qualified copper core wire copper core should be purple, shiny and soft to the touch. False copper core wire is purple-black, yellow or white, with many impurities and poor mechanical strength and toughness. It will break with a little force, often breaking wires. When checking, just peel off one end of the wire by 2 cm, and then gently rub it on the copper core with a piece of white paper. If there is a black substance on the white paper, it means that there are many impurities in the copper core. In addition, the insulation of fake and inferior wires seems to be very thick. In fact, most of them are made of recycled plastics. Over time, the insulation layer will age and leak electricity. Fifth, look at the price. Because of the low production cost of fake and shoddy wires, vendors often sell them at low prices under the guise of good quality and low price, which makes people fall for it. You can identify the brand of wire by the above method. Well, you can try without taking precautions.