home improvement is inseparable from wires, and the selection 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 and resistant to aging and damage. Specific standards should adopt BVV2×2.5 and BVV2×1.5 wires. BVV is a national standard code, which is a copper sheath line. 2×2.5 and 2×1.5 represent 2-core 2.5 square millimeters and 2-core 1.5 square millimeters respectively. In general, 2×2.5 is used as the main line and trunk line, and 2×1.5 is used as the single electrical branch line and switch line. BVV2×4 is used for single-phase air-conditioning dedicated line, and special ground wire is also provided.

Brand Store: Panda Wire

But 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 and the way to buy

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

it's much more troublesome for people in 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 ones 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. Second, carefully test

Generally, you will buy red, blue and flowered wires for decoration, cut off a section of each of the three wires, and do the following tests

1. Absorb with a magnet to see if the wires contain iron.

2. screw micrometer to see the diameter of copper wire. 2.5 square 1.78 mm, not less than 1.762. 4 square 2.25 mm.

3. Take an ammeter and measure the resistivity.

4. Look at the copper color. First of all, look at whether the colors of these three wires are consistent. Because of poor production technology, the fake wires have various colors and different thicknesses. True wires have the same thickness and color, especially bright metallic color (because they are also alloys, which is a little different from the color of pure copper).

third move, observation indicators

1. Is there the "Great Wall Mark" and the production license number on the wire packaging label that is first regarded as a roll?

2. Look at whether the outer plastic skin of the wire is bright in color and fine in texture, and there should be no open flame when it is lit with a lighter. Informal products use recycled plastics, which are dull in color and loose in texture and can ignite open flames.

3. Secondly, look at the length and price. The length of each roll of BVV2×2.5 is 1 5 meters, and the market price is about 28 yuan. The length of informal products varies from 6 to 8 meters. Some manufacturers make the insulating sheath thick, which makes it difficult for experts to see the problem. You can count the number of turns of the wire, and then multiply it by the radius of the whole roll to roughly calculate the length. The price of this kind of products is between 1 and 13 yuan.