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2018-12-09
A major breakthrough in the application of domestic high-end CNC machine tools
The formula in this section does not directly point out the current carrying capacity (safe current) of various insulated wires (rubber and plastic insulated wires), but "the cross section is multiplied by a certain multiple" to show that it is obtained by mental calculation. It can be seen that the multiple decreases with increasing cross-section.
"multiply 2.5 by nine, go up minus one number" refers to aluminum core insulated wires with various cross sections of 2.5mm' and below, and its current carrying capacity is about 9 times of the number of cross sections. For example, for a 2.5 mm' wire, the current carrying capacity is 2.5 × 9=22.5(A). From 4mm' and above, the multiple connection between the current carrying capacity and the number of cross sections is arranged up along the line number, and the multiple is successively reduced by L, I .e. 4 × 8, 6 × 7, 10 × 6, 16 × 5, 25 × 4.
"Thirty-five times 3.5, double groups minus five points" means that the current carrying capacity of a 35mm conductor is 3.5 times the number of cross sections, I .e. 35 × 3.5=122.5(A). For wires of 50mm' and above, the multiple connection between the current carrying capacity and the number of cross sections becomes a group of two wire numbers, and the multiple is reduced by 0.5 in turn. That is, the current carrying capacity of 50 and 70mm 'wires is 3 times of the number of cross sections; The current carrying capacity of 95 and 120mm conductors is 2.5 times of their cross-sectional areas, and so on.
"Conditions change plus conversion, high temperature 10% copper promotion". The above formula is aluminum core insulated wire, exposed to the ambient temperature of 25 degrees Celsius under the conditions. If the aluminum core insulating wire is exposed to an area where the ambient temperature is higher than 25 ℃ for a long time, the current carrying capacity of the wire can be calculated according to the above formula calculation method, and then 10% discount can be made. When not aluminum wire but copper core insulated wire is used, its current carrying capacity is slightly larger than that of the same standard aluminum wire, and the current carrying capacity of one line number larger than that of aluminum wire can be calculated according to the above formula. For example, the current carrying capacity of 16mm' copper wire can be calculated according to 25mm2 aluminum wire.
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