·The Calculation of Wire Cross-sectional Area and Carrying Capacity
Insulated aluminum full flow, wire cross-section by multiples; 2.5 multiplied by nine the next, to go up by a cis-number;
35 multiplied by 3.5, both in groups by point 5; conditions change discount calculation, high-temperature copper nine times upgrade;
Wear a tube root number 234. 876 off full flow.
Note: The formulas for a variety of insulated wire (rubber and plastic insulated wire) of the carrying capacity (security-current) is not explicitly stated, but with the cross-section multiplied by a certain multiple of to that derived by mental arithmetic.
"Under the 2.5 multiplied by nine, and go up by a cis-number," refers to 2.5 mm2 and below, a variety of cross-sectional area of the aluminum core insulated wire, its cross-sectional area of the current carrying capacity is about 9 times. Such as 2.5 square meter wire, its carrying capacity of 2.5 × 9 = 22.5 (A). 4 mm2 or more of the wire carrying capacity and the number of cross-sectional area along the line of numbers in multiples of relationship is up row by a multiple of the value of successive, that is 4 × 8.6 × 7.10 × 6.16 × 5.25 × 4.
"35 × 3.5, both in groups by five-point" refers to 35 mm2 wire carrying capacity of 3.5 times the number of cross-sectional area, that is 35 × 3.5 = 122.5 (A). 50 mm2 and above carrying capacity and the wire cross-sectional area in multiples of the relationship between the number of numbers into two lines into one group, followed by a multiple of 0.5. i.e. 50.70 mm wire carrying capacity for the cross-sectional area of three times; 95.120 mm2 wires carrying capacity is 2.5 times the cross-sectional area, and so on.
"Conditions have changed in discount calculation of high-temperature copper nine times upgrade" is the aluminum core insulated wire for surface temperature of 25 degrees Celsius in the environment under the conditions of the set. If the aluminum core insulated wire for surface at ambient temperature above 25 degrees Celsius in areas a long time, wire current carrying capacity of the above-mentioned formulas can be calculated, and then can be multiplied by 0.9; when using copper instead of aluminum core wire is not insulated wire, the carrying capacity is slightly larger than the number of the same size aluminum, calculated according to the above formulas means a line number greater than the aluminum of the carrying capacity. For example, the 16 mm copper wire carrying capacity 25 mm2 aluminum can be calculated.
"Wearing tube root number 234.876 off full flow," said wear tube wiring is insulated wire, the wire with the tube root number increased, wires carrying capacity smaller. The specific estimation method is: first as a conductor for surface, using formulas to calculate results, and then the same number of pipe threading the number of roots, respectively, that have lent to fight off a carrying capacity. For example, a tube wear two lines, and then multiplied by 0.8; wearing a three-wire or 4 line, multiplied by 0.7 and 0.6, respectively.
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