Computer anywhere in the city we can see a variety of power cord, different thickness, length are different, different colors, people really see dazzling. In such a market is not regulated, the quality of the Power Cords is also very big difference. Similarly a power line, why the market sold above the price difference will be so big? In the end is a highly profitable manufacturer or otherwise trick it? Here let us tell you from various angles, the importance of power line safety and how to choose a good power cord.
First, the power cord core material:
National standards for 250V, 10A power cord area required to achieve 0.75mm2, the production of standard power cord is 24 shares or 42 shares of 0.20mm to 0.15mm copper wire copper wire. Sectional area = πr2 = 3.14 × (0.2 / 2) 2 × 24 = 0.7536mm2, or cross-section of the total area = 3.14 × (0.15 / 2) 2 × 42 = 0.7418mm2. 24 shares of 0.20mm copper wire using power lines that fully meet the national standard, based on leave enough margin.
But the market many manufacturers to reduce costs, can be 0.2mm or 0.15mm would need to wire power cord made of 0.14mm copper wire, and even exaggerated will be 0.12,0.13 mm, a cross-section of the original 0.75mm2 line to make a 0.65mm2. Relative to the following terms. This is a fairly generous.
Some even painted yellow aluminum chemicals to when charging wire, it is with the naked eye can not see out of. But as long as the top of a fire, get burned, you can tell the difference. Aluminum instead of copper, cutting corners is even more obvious, such as a serious threat to the power line safety of consumers.
As the conductivity of aluminum copper only 2 / 3, so any national standard for transmission of electrical energy wire and cable must not plated or gold-plated annealed copper wire as conductor genus, prohibit the use of aluminum (including copper clad aluminum wire) as a conductor. If the civil engineering field, can easily cause a fire due to heat, thereby endangering the personal and property safety.