Which wire is the safest?

Household power cords should use BVV2 x 2.5 and BVV2 x 1.5 models of wires. BVV is a national standard code and is a copper sheathed wire. 2x2.5 and 2x1.5 represent two cores 2.5 mm2 and two cores 1.5 mm2 respectively. Under normal circumstances, 2 × 2.5 as the main line, trunk, 2 × 1.5 as a single electrical branch, switch line. The single-phase air-conditioning line uses BVV2 × 4 and is equipped with a dedicated ground wire.

To purchase electric wires, first of all, see whether the “Great Wall Mark” and the production license number of the China Electrical Products Certification Committee are on the packaging of the wound wire; see if the outer plastic skin of the wire is of bright color and fine texture. There should be no open flame when lit with a lighter. Informal products using recycled plastics, dull color, loose texture, can ignite the open flame; followed by the length, specific price, BVV2 × 2.5 The length of each roll is 100 ± 5 meters, the market price of 280 yuan, the length of informal products 60-80 meters, some manufacturers do E-insulative skin thick, so that the experts are also difficult to see the problem, you can generally count the number of turns of the wire, and then multiply by the radius of the entire roll, you can roughly calculate the length, The price of this kind of product is between 100-130 yuan; Secondly, it can require the business to cut a head and look at the copper core material. 2×2.5 copper diameter 1.784mm, available micrometer measuring, regular product wire using red copper, outer bright and slightly soft, non-regular copper black and hard, is a regenerative copper, resistance The high rate and poor electrical conductivity can raise temperature and make it unsafe. Finally, the purchase of electrical wires should go to the electricity shop or the manufacturer's sales department.

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