The electrician chooses the line, there are mouths, 10, 5, and 3, meaning 5 electric currents per square meter of copper wire below 10 square meters, 3 currents per square meter of copper wire above 100 square meters, half of aluminum wire
China's household voltage is generally 220V
1.5 square millimeters of line current = 10A (ampere); carrying power = current 10A * 220V = 2200 watts
2.5 square millimeter line current = 16A (ampere) minimum; carrying power = current 16A * 220V = 3520 watts
4 square millimeters of line current = 25A (ampere); carrying power = current 25A * 220V = 5500 watts
6 square millimeters of line current = 32A (ampere); carrying power = current 32A * 220V = 7064
1. The relationship between the current carrying capacity of the aluminum-silicon insulated wire and the cross-section of the cross-section is 10, 5, 100, 2, 25, 35, 4, 3, 70, 95, twice and a half, through the tube, temperature, eight or nine fold. Half of the bare wire is added, and the copper wire is upgraded.
2. It is indicated that the current carrying capacity (A) of various cross-sections is not directly indicated, but is multiplied by a certain multiple of the cross-section. To this end, the nominal cross-section (square mm) of common conductors in China is arranged as follows:
1, 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185...
(1) The first sentence indicates that the aluminum core insulated wire current carrying capacity (A) can be calculated as a multiple of the cross section. The Arabic numerals in the mouth indicate the wire cross section (square millimeters), and the Chinese character numbers indicate multiples. Arrange the cross section of the mouth and the multiple relationship as follows:
1 ~ 10 16 , 25 35 , 50 70 , 95 120 or more } } } } } five times four times three times two and a half times two times
Now it is more clear to compare with the mouth. The mouth of the mouth is “10 to 5â€, which means that the cross section is below 10 and the current carrying capacity is five times the cross-sectional value. "100 upper two" (reading two hundred and two) means that the current carrying capacity of 100 or more in cross section is twice the cross-sectional value. Sections 25 and 35 are four and three times the boundary. This is the mouth of "25, 35, four or three circles." The cross-sections 70 and 95 are two and a half times. It can be seen from the above arrangement that, except for 10 or less and 100 or more, the cross section of the middle wire is the same multiple for each of the two specifications.
For example, aluminum core insulated wire, the calculation of the current carrying capacity when the ambient temperature is not more than 25 ° C:
When the cross-section is 6 mm 2 , the current carrying capacity is 30 amps; when the cross-section is 150 mm 2 , the current carrying capacity is 300 amps; when the cross-section is 70 mm 2 , the current carrying capacity is 175 amps.
It can also be seen from the above arrangement that the multiple decreases as the cross section increases, and the error is slightly larger at the boundary of the multiple transition. For example, sections 25 and 35 are four times and three times the boundary, 25 is four times the range, which is calculated as 100 amps by mouth, but 97 amps according to the manual; and 35 is opposite, 105 amps by mouth, but Check the table for 117 amps. However, this has little effect on the use. Of course, if you can "have a number in the chest", when you select the cross section of the wire, 25 does not let it fill 100 amps, and 35 can be slightly more than 105 amps more accurate. Similarly, the 2.5 mm square wire is at the beginning of five times, and the actual time is more than five times (up to 20 amps or more). However, in order to reduce the power loss in the wire, the current is usually not used so much. 12 amps.
(2) The last three sentences are the treatment of conditional changes. "Pipe, temperature, eight or nine fold" means: if the pipe is laid (including the laying of the trough plate, that is, the wire is covered with a protective cover layer, it is not exposed), and then the calculation is repeated after 20%; if the ambient temperature exceeds 25 °C, after the calculation, then make a 10% discount. If the pipe is laid, the temperature will exceed 25 °C, then hit a 20% discount and then make a 10% discount, or simply press once to make a 30% discount. Regarding the ambient temperature, the average maximum temperature of the hottest month in summer is specified. In fact, the temperature is variable. In general, it affects the wire current carrying capacity is not very large. Therefore, discounts are only considered when there are more than 25 °C in some high temperature workshops or hotter areas.
For example, the calculation of the download flow rate of the aluminum core insulated wire under different conditions:
When the cross section is 10 mm 2 , the current carrying capacity is 10 × 5 × 0.8 = 40 amps; if it is high temperature, the current carrying capacity is 10 × 5 × 0.9 = 45 amps; if the tube is high temperature, the current carrying capacity is 10 ×5 × 0.7 = 35 amps.
(3) For the current carrying capacity of the bare aluminum wire, the mouth indicates “half the bare wireâ€, that is, add half after the calculation. This means that the same cross-section bare aluminum wire is compared with the aluminum core insulated wire, and the current carrying capacity can be increased by half. For example, the calculation of the carrying capacity of bare aluminum wire:
When the cross section is 16 mm 2 , the current carrying capacity is 16 × 4 × 1.5 = 96 amps. If the temperature is high, the current carrying capacity is 16 × 4 × 1.5 × 0.9 = 86.4 amps and 6 mm 2
Current = 32A (A); Carrying power = current 32A * 220V = 7064
Copper wire below 10 square millimeters 5A per square millimeter. Copper wire of 11-99 square millimeters per square millimeter. 4A 100 square millimeters or more of copper wire per square millimeter. 3A aluminum wire per square millimeter is divided by 2, that is, half of the above value.
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