The relationship between the current carrying capacity of aluminum insulated wire and the multiple of the section
Wire cross section
(mm 2 )
1
1.5
2.5
4
6
10
16
25
35
50
70
95
120
Current carrying is a section
multiple
9
8
7
6
5
4
3.5
3
2.5
Ampacity
(A)
9
14
twenty three
32
48
60
90
100
123
150
210
238
300
Estimated vocabulary:
Multiply by 9.5 and multiply by nine.
Thirty-five by three-five, and the two groups are reduced by five.
The conditions have been changed and converted, and the high temperature ninefold copper upgrade.
The number of tubes to be worn is two to three, and eighty-seven percent is full of current.
Description:
(1) The current carrying capacity (safety current) of various insulated wires (rubber and plastic insulated wire) in this section is not directly indicated, but is expressed by "multiplied by a certain number of sections", which is obtained by mental arithmetic. It can be seen from Table 5 3 that the multiple decreases as the cross section increases.
"Twenty-five times down to nine, go up one minus one" is said to be 2.5mm' and below various cross-section aluminum core insulated wires, the current carrying capacity is about 9 times the number of sections. For example, a 2.5 mm' wire has a current carrying capacity of 2.5 x 9 = 22.5 (A). The multiple of the current carrying capacity and the number of sections from the wire of 4 mm' and above is the upper row along the line number, and the multiple is successively decreased by 1, that is, 4 × 8, 6 × 7, 10 × 6, 16 × 5, 25 × 4.
"Thirty-five times three-five-five, double-group reduction of five points," said that the 35mm" wire current carrying capacity is 3.5 times the number of sections, that is, 35 × 3.5 = 122.5 (A). For a wire of 50 mm' and above, the multiple relationship between the current carrying capacity and the number of sections becomes a set of two two wire numbers, and the multiple is sequentially decreased by 0.5. That is, the current carrying capacity of the 50, 70 mm' wire is 3 of the number of sections. Double; 95, 120mm" wire current carrying capacity is 2.5 times the number of its cross-sectional area, and so on.
"The conditions have been changed and converted, and the high temperature ninefold copper upgrade." The above-mentioned port is determined by the aluminum core insulated wire and the bright coating at an ambient temperature of 25 ° C. If the aluminum core insulated wire is applied in an area where the ambient temperature is higher than 25 °C for a long time, the current carrying capacity of the wire can be calculated according to the above-mentioned calculation method of the mouth and then 10% off; when the copper wire is insulated, the copper core is used. Its current carrying capacity is slightly larger than that of the same specification aluminum wire. The above-mentioned port method can be used to calculate the current carrying capacity of one wire number than the aluminum wire. For example, the current carrying capacity of a 16mm' copper wire can be calculated as a 25mm2 aluminum wire.
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