source:Industry News Popular:adapter release time:2021-05-18 13:54:52 Article author:sznbone
It is often said that a few square wires are not added with a unit, that is, square millimeters. The square of the wire actually refers to the cross-sectional area of the wire, that is, the area of the circular cross-section of the wire, in square millimeters. There is a simple calculation method: if we use a caliper to measure the diameter of the copper wire core is 1mm, and then multiply by the coefficient of 0.7854, 1 X 1 X 0.7854=0.7854mm2, then this wire is 0.7854 square wire, with the American standard 18AWG Take the No. 18 wire as an example, the standard of No. 18 wire is 0.824mm2, then the diameter of the copper core measured with a caliper should be between 1.02mm and 1.1mm.
Generally speaking, when the power grid voltage is 220V, the empirical power carrying capacity per square wire is about one kilowatt. Each square of copper wire can carry 1-1.5 kilowatts of electricity, and each square of aluminum wire can carry 0.6-1 kilowatts of electricity. Therefore, only one square of copper wire is sufficient for an electrical appliance with a power of 1 kilowatt. When it comes to current, the copper wire can carry 3A to 5A per square meter during short-distance power transmission. The heat dissipation condition is better to take 5A/square millimeter, and it is not good to take 3A/square millimeter.
Here is a warm reminder for power cord manufacturers: The European Commission confirmed that the CE certification Low Voltage Directive (LVD) standard EN 62368-1:2014 will be implemented on December 20, 2020, and the United States has announced the same mandatory implementation of the corresponding UL standard. date. Whether it is a well-known brand enterprise or a manufacturer of electronic and electrical products, it should be implemented as soon as possible to enable products to enter various markets safely and quickly, improve product competitiveness, and minimize the impact of standard conversion cycles on people, costs and time. influences.
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