In home electrical installations, it's essential to use the right type of wiring. Typically, household power cables should be BVV2×2.5 and BVV2×1.5 models. These are copper-sheathed wires, with BVV2×2.5 representing two cores of 2.5 square millimeters and BVV2×1.5 indicating two cores of 1.5 square millimeters. The main electrical lines are usually made with BVV2×2.5, while BVV2×1.5 is used for individual branch circuits or switch connections. For air conditioners, a thicker wire such as BVV2×4 is recommended, along with a dedicated ground wire for safety.
When purchasing wires, there are several things you should check. First, look for the "Great Wall Mark" on the packaging and verify the production license number from the China Electrotechnical Products Certification Committee. Next, examine the outer plastic coating — it should be smooth, bright, and not easily flammable. Non-qualified products often use recycled plastics, which tend to be dull in color, have a rough texture, and burn more easily.
Another thing to consider is the length and price. A standard roll of BVV2×2.5 should be around 100 meters, with a market price of approximately 280 yuan. However, some counterfeit products may only contain 60 to 80 meters. Some manufacturers even make the insulation thicker to hide the shortage, so you can estimate the actual length by counting the number of turns and multiplying by the radius of the roll. These fake products usually cost between 100 to 130 yuan. Additionally, ask the seller to cut a small piece so you can inspect the copper core. The copper wire in genuine BVV2×2.5 should have a diameter of 1.784 mm, which can be measured with a micrometer. High-quality copper is bright red, soft, and shiny, while inferior ones are dark, hard, and made from recycled materials, leading to higher resistance and potential overheating risks.
It’s best to buy wires from professional stores or directly from the manufacturer’s sales office. Home renovation always involves wiring, especially in older homes where aging or substandard wiring can lead to fires. Therefore, it’s crucial for consumers to be careful when selecting wires and to thoroughly inspect them before making a purchase.
The market today is flooded with various types of wires, making it challenging for buyers to choose the right one. Even for commonly used wires like 2.5mm² and 4mm² copper cables, prices can vary by up to 20% to 30% depending on the brand. Quality differences are also significant, and it's hard for consumers to tell just by looking. Industry experts say that the main reason for the price difference lies in the raw materials used. The primary components are electrolytic copper, insulation, and sheathing materials. Electrolytic copper costs around 20,000 yuan per ton, while recycled copper is only about 15,000 yuan. High-quality insulation and sheathing materials range from 8,000 to 8,500 yuan per ton, while lower quality versions can be as low as 4,000 to 5,000 yuan.
Additionally, insufficient length and poor-quality insulation also contribute to the price gap. A standard roll should be 100 meters long, but some fake products may only have 90 meters. The rubber content in good insulation is typically 35% to 40%, whereas defective ones might have as little as 15%. These differences clearly affect the final selling price. As a consumer, it's important to be informed and cautious to avoid being misled.
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