How to distinguish between high quality and poor quality of power cables
How to distinguish between high quality and poor quality of power cables
- Look at the label. The conductor certificate produced by regular manufacturers shall include: 3C certification mark, certification number, model and specification, executive standard, rated voltage, conductor length, production date, manufacturer, inspector, factory name, address and fixed telephone. Anti counterfeiting signs, etc. Labels of counterfeit products are often printed unclear or incomplete. Qingzhou cable manufacturer is a regular manufacturer with qualified quality.
2. Look at the surface. The plastic skin of ordinary wires is soft and smooth with uniform color. Several items on the product certificate shall also be printed on its surface, such as 3C certification mark, certification number, model, rated voltage, executive standard, factory name, etc. at the same time, the handwriting must be clear and not easy to erase.
3. Look at the burning flame. According to the regulations, the insulation layer of the wire has certain flame retardancy. Peel off the insulation and light it with a lighter. This is a poor quality wire. It can continue to ignite after leaving the open fire.
4. The resistance value does not meet the national standard
Under the same current, the temperature of the conductor with excessive resistance may be too high, which will accelerate the aging of the external insulation layer and cause short-circuit fire. Moreover, the excessive resistance will greatly increase the energy consumption in the transmission process and increase the power cost.
5. Poor raw materials
(1) It is the concept of copper conductor, which accounts for 80% of the conductor cost. One of the bad conductor manufacturers is to reduce the quality of copper. The use of much lower priced impurity copper, recycling copper, and even local copper smelting, the copper content is extremely unstable, resulting in a significant increase in the resistivity of copper conductor.
(2) In order to reduce the actual cross-sectional area of the copper core, the direct consequence of these two methods is that the conductor is overheated during use, damaging the plastic of the insulating layer, causing short circuit and fire.
