How to choose home improvement wires?

1, look at the appearance. The insulation (sheath) layer of qualified products is soft, tough and elastic, and the surface layer is dense, smooth, without roughness and pure luster. The surface of insulation (sheath) layer should be clearly marked with wear resistance. For the products produced by informal insulation materials, the insulation layer feels transparent, fragile and inflexible. See if the plastic skin outside the wire is bright in color and delicate in texture, and 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.

2. Look at the insulation. The national standard stipulates that the uniformity of wire insulation should be finer, and the average thickness has clear data. The insulation layer thickness of the regular conductor is uniform, the core wire is not eccentric, and it is tightly wrapped on the conductor.

3. look at the certificate. First of all, whether there is the "Great Wall logo" and the production license number of China Electrical Product Certification Committee on the wire packaging card. The standard product certificate shall indicate the manufacturer's name, address, after-sales service telephone number, model, specification structure and nominal cross section (i.e. 2.5 square and 4 square wires, etc.). ), rated voltage (single core wire 450/750V, double core sheath line 300/500V) and length (the length specified in the national standard is1100m0.5m). In particular, it is pointed out that the model of ordinary single-core copper-core plastic wire marked on regular products is 227 IEC0 1(BV), not BV. Please pay attention.

4. Look at the core. The wire core is made of pure copper, which has undergone strict drawing, annealing (softening) and twisting. Its surface should be bright, smooth, burr-free, smooth, soft and tough, and not easy to break. You can ask the merchant to cut a broken head and look at the copper core material. The diameter of 2×2.5 copper core is 1.784 mm, which can be measured by micrometer. The regular product line is made of pure copper, and the outer layer is bright and slightly soft. Informal product copper is dark and hard, belonging to recycled copper, with high resistivity and poor conductivity, which will increase the temperature and be unsafe.

5. Look at the length and price. BVV2×2.5 each roll length1005m, the market price is around 280 yuan. The length of each roll 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 turns of the wire and multiply it by the radius of the whole coil, and then you can roughly calculate the length. The price of such products ranges from 100 to 130 yuan.

According to the actual needs of the family, in terms of specific specifications and models, what kind of wires should be chosen for family decoration?

For fire prevention, maintenance and safety, it is best to choose the "national standard" copper core with the Great Wall logo. When decorating, the cross-sectional areas of different wires are as follows: lighting wire 1.5mm, socket wire 2.5mm, air conditioning wire not less than 2.5mm, green and yellow double-color wires for wiring, and any one of red, white, black and purple for connecting switch wires (live wires).

The household power cord should be BVV2×2.5, BVV2× 1.5. 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. In general, 2×2.5 lines are used as main lines and trunk lines, and 2× 1.5 lines are used as electrical branch lines and switch lines. Single-phase air conditioning special line adopts BVV2×4, and special grounding wire is provided.

Selection of threading pipe: the threading pipe should be flame-retardant PVC pipe, with smooth wall and thickness that can't be broken by fingers, with certificate of approval, or a galvanized pipe special for national standard should be used as threading pipe.