Experts suggest teaching you how to buy high-quality wires.

Home improvement is inseparable from wires, and the purchase of wires is particularly important in the decoration process. When purchasing wires, you should first use copper core wires that meet the standards. Insulation materials should be reliable, aging-resistant and not easily damaged. The specific standards should be BVV2×2.5 and BVV2× 1.5 lines. BVV is a national standard code, which is a copper sheathed line. 2×2.5 and 2× 1.5 represent 2-core 2.5 mm2 and 2-core 1.5 mm2 respectively. Generally, 2×2.5 is used as the main line and trunk line, and 2× 1.5 is used as a single electrical branch line and switch line. Single-phase air conditioning special line adopts BVV2×4, and special grounding wire is provided.

Brand store: Panda Line

However, there is a difference between theory and reality. Now fakes are more real than real ones. Therefore, combined with experts' decoration experience, talk about three ways to buy wires in reality.

The first move, the way to buy

In big cities, it is actually very easy to buy genuine products. Just call the factory to buy it. Beijing directly dials Kunlun Factory, and the line of 25 is 168 yuan (the national standard line of Dachang is full scale). You can choose pandas in Shanghai, and there are places to order them online.

It is much more troublesome for small cities. Before buying, you can call the factory and ask if there is an agent in this city and whether there is delivery. If not, try not to choose these brands of wires. Most of the things bought outside are fake. When buying wires from unknown manufacturers, try to choose products from wire factories in big cities, and it is best to buy them from agents, which is cheap and reliable. The second measure is careful testing.

Generally, I will buy red, blue and flower lines for decoration, cut off and plane the three lines, and do the following tests.

1, use a magnet to see if the wire contains iron.

2. Screw micrometer (micrometer) to see the diameter of copper wire. 2.5 square1.78mm, not less than 1.762. 4 square, 2.25 mm.

3. Measure the resistivity with an ammeter.

4, look at the copper color, first of all, look at whether the colors of these three lines are consistent, because the production process is poor, the fake lines are varied in color and inconsistent in thickness; The thickness and color of real wires are the same, especially the shiny metallic color (because it is also an alloy, which is a little different from the color of pure copper).

The third measure is the observation index.

1. Is there the "Great Wall Logo" and the production license number of China Electrical Product Certification Committee on the wire packaging card that is first regarded as a roll?

2. See if the plastic skin on the outer layer of the wire is bright in color and delicate in texture. There should be no open flame when lit with a lighter. Informal products use recycled plastics, which are dull in color and loose in texture, and can ignite open flames.

3. Second, look at the length and price. BVV2×2.5 each roll length1005m, the market price is around 280 yuan. The length of informal products ranges from 60 meters to 80 meters. Some manufacturers make the insulation sheath very thick, so it is difficult for experts to see the problem. You can count the number of turns of the line and multiply it by the radius of the whole roll to roughly calculate the length. The price of such products ranges from 100 to 130 yuan.