『Calculation method for current carrying capacity of wires』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1.2.5 square copper wire current carrying capacity
2.5 square wire can carry 3 horsepower air conditioning. According to the current carrying capacity of the wire, the allowable long-term load current for a 2.5-square copper core wire is 16A to 25A, calculated at 16 amperes. P=UI=220 × 16=3520 watts, 3 horsepower=3 × 735=2205 watts; 3520 watts>2205 watts. So a 2.5 square millimeter wire with 3 horsepower air conditioning. Additional information: Power formula for 220V50HZ AC power: P=UI; 1 horsepower equals 735 watts. According to the Chinese national standard GB/T 4706.1-2005, the allowable long-term load current for 2.5 square copper core wires is 16A to 25A; Note: The "square" mentioned above refers to "square millimeters". According to the safe current carrying capacity, the safe current carrying capacity of a pure 2.5 square millimeter wire is 19 amperes. The wiring method is related, and exposure to air is better for heat dissipation than laying in pipes. Necessary overcurrent protection devices should be installed in the circuit. Users are not allowed to extend the line or illegally use high-power electrical appliances such as electric furnaces, nor are they allowed to change the setting value of overcurrent protection devices without authorization, such as replacing fuses with copper wires. The safe current carrying capacity of wires and cables is related to factors such as the cross-sectional area of the wires, the type of insulation material, environmental temperature, and installation method. The safe current carrying capacity of the busbar is also related to the geometric shape and arrangement of the busbar. Reference source: Baidu Baike - Conductor Current Carrying Capacity Reference source: Baidu
2. How to Calculate Wire Current Carrying Capacity (Formula)
3. How to Calculate Wire Current Carrying Capacity? The current carrying capacity of a cable is related to the cross-sectional area of the conductor, as well as the material, model, laying method, and environmental temperature of the conductor, and the calculation is also cumbersome. The current carrying capacity of various wires can usually be found in the manual. But by using mnemonics combined with some simple mental calculations, the current carrying capacity of the wire can be directly calculated, which is more convenient. Closed loop current carrying capacity is the maximum current that a conductor can continuously carry without causing its stable temperature to exceed the specified value under specified conditions. The approximate multiple relationship between wire cross-sectional area (mm2) and current carrying capacity (A) is commonly used for aluminum core wires. The approximate relationship between nominal cross-sectional area and current carrying capacity is as follows: Formula and explanation of the relationship between wire cross-sectional area and current carrying capacity. The current carrying capacity with a cross-sectional area of 100mm2 or more is twice the cross-sectional area value. 2
5, 35,
For the fourth and third boundaries with cross-sectional areas of 25mm2 and 35mm2, the current carrying capacity is at the boundary of 4 times and 3 times. 70, 95, with a cross-sectional area of 70mm
2, 95mm2, the current carrying capacity is 2.5 times the cross-sectional area. For conduit installation (including trough plates, etc.), where the wires are covered with protective s
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