A friend asked about the current carrying capacity of wires and cables. As we mentioned before, it is troublesome to calculate through reflection. There is a verdict here, let's summarize it together.
First, the current situation
The 1 amp millimeter copper wire has different amperages at different currents. The theoretical maximum value is 15A, which can be calculated according to 9A-13A when we use it normally.
1 square millimeter copper wire:
Overhead line 15A, applied to the wall 11-12A, around the sheath line 9A, through the tube 5-7A.
In this case, a square copper wire, a stable current carrying capacity of 6A is no problem.
Therefore, in terms of the current carrying capacity of the wire, it is more controversial. It is difficult to calculate a very specific current carrying capacity. Because the environment is different, we generally estimate the value for reference, so that we have a bottom in the actual project application center.
Second, the estimated mouth
Cable current carrying capacity estimate:
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.
Explanation: The multiple decreases as the cross section increases.
"Two to five times multiplied by nine, go up one minus one." It is said that the aluminum core insulated wires of various sections of 2.5mm' and below have a current carrying capacity of 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 decremented by 1, that is, 4 × 8, 6 × 7, 10 × 6, 16 × 5, 25 × 4.
"Thirty-five times by three-five, two pairs of points minus five", said that the 35mm" wire current carrying capacity is 3.5 times the number of sections, that is, 35 × 3.5 = 122.5 (A).
From 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 multiples are successively reduced by 0.5. That is, the current carrying capacity of the 50 mm wire is three times the number of sections, that is, 50 × 3 = 150 A; the current carrying capacity of the 70, 95, 120 mm wire is 2.5 times the number of sectional areas thereof, and so on.
"The conditions have been changed and converted, and the high temperature ninefold copper upgrade." The above-mentioned port is determined by an aluminum core insulated wire and a plain 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 used instead of the aluminum wire, the current carrying capacity is slightly larger than that of the aluminum wire of the same specification. The current capacity of the wire number can be calculated by the above-mentioned port method. For example, the current carrying capacity of a 16mm' copper wire can be calculated as a 25mm2 aluminum wire.
"The number of tubes to be worn is two to three four, and eighty-seven percent is full of current." When two are worn, the current carrying capacity should be calculated at 8 percent, three for seven, and four for six.
The general copper wire safety current estimate is:
The safe current carrying capacity of the 2.5 square millimeter copper power cord is around -28A.
The safe current carrying capacity of the 4 square millimeter copper power cord is about 35A.
The safe current carrying capacity of the 6 square millimeter copper power cord is about 48A.
The safe current carrying capacity of the 10 square millimeter copper power cord is about 65A.
The safe current carrying capacity of the 16 square millimeter copper power cord is about 91A.
The safe current carrying capacity of the 25 square millimeter copper power cord - about 120A.
Aluminum wire, the same current carrying capacity, the wire diameter should be 1.5 times of the copper wire.
Third, examples
The general application is as follows:
1, 1.5mm2---spotlights;
2, 2.5mm2---socket, such as air conditioning (1.0p or 1.5P air conditioning), main lighting, electric water heaters, etc.;
3, 4.0mm2---Specially large appliances, household lines, or special occasions, such as cabinet air conditioners. air conditioning. The 2.5mm2 wire has a safe power of at least 3.2 kW.
If the on-hook air conditioner is 1.5p, the number of horses refers to the power consumption of the appliance, 1 horse = 1 horsepower = 735W, and the total power = 1.5 * 735 = 1102W. Some friends mentioned that it is enough to use a 2.5mm2 wire, but we still recommend using a 4.0mm2 wire.
The other is the kitchen, which meets: lighting, hood, gas water heater, disinfection cabinet, refrigerator, microwave oven.
If the home bathroom uses electric water heaters, it is also recommended to use a separate 4.0mm2 circuit for the bathroom, which can meet the needs of the bathroom: electric water heater, Yuba, heater, lighting, etc.
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