“Five to multiply by two at five, and one at a time to go down†is to say that various sections of aluminum-core insulated wire of 2.5 mm or below have a current carrying capacity of approximately 9 times the number of sections. Such as 2.5mm' wire, the current capacity of 2.5 × 9 = 22.5 (A). The multiple of the current carrying capacity and the number of cross-sections of the conductors from 4 mm' and above is the row along the line number, and the multiple is successively reduced by l, that is, 4×8, 6×7, 10×6, 16×5, and 25×4.
"Thirty-five-by-three and five points, both in groups minus five points," said 35mm" wire carrying capacity is 3.5 times the number of sections, that is, 35 × 3.5 = 122.5 (A). From 50mm' and above In the wire, the multiple relationship between the current carrying capacity and the number of cross-sections is changed into two groups of two wire numbers, and the multiple is successively decreased by 0.5, that is, the current carrying capacity of the 50 and 70 mm' wires is 3 times the number of cross-sections; 120mm" wire carrying capacity is 2.5 times its cross-sectional area, and so on.
"Conditions are subject to change, high temperature 10% copper upgrade". The above-mentioned mouthpiece is made of an aluminum core insulated wire and an open coating under the condition of an ambient temperature of 25°C. If the aluminum core insulation wire is deposited in an area where the ambient temperature is higher than 25°C for a long time, the wire carrying capacity can be calculated according to the above formula, and then it can be used for 10%. When the aluminum wire is used instead of the aluminum wire, the copper core wire is used. Its ampacity is slightly larger than that of aluminum wire of the same specification. The ampacity method can be used to calculate the ampacity of one line number more than aluminum wire. For example, the current carrying capacity of 16mm' copper wire can be calculated as 25mm2 aluminum wire.
"The number of pipe worn is 234, and the full load current is 877.6. This means that in the case of laying two, three, or four wires through a pipe, the current carrying capacity is calculated by the electrician's mouth and the ampacity (single). 80%, 70%, 60%.
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