Formula for calculating the current carrying capacity of a wire | How to calculate the current carrying capacity of a wire?

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How to calculate the current carrying capacity of a wire?

1. According to the national standard GB4706.1-1992/1998, the calculation method for the load current value of wires is as follows: - For 1.

5, 2.

5,

4,

6, and 10mm ² wires, the load current value is calculated by multiplying the cross-sectional area of the wire by five times. -For wires with 1

6 and 25mm ², the load current threshold is 4 times the cross-sectional area of the wire. -For wires with 3

5 and 50mm ², the load current value is multiplied by three times the cross-sectional area of the wire. -For wires of 70 and 95mm ², the load current value is 2.5 times the cross-sectional area of the wire. -For wires of 120, 150, and 185mm ², the load current value is twice the cross-sectional area of the wire. At a working temperature of 30 ℃ and a long-term continuous load of 90%, the current carrying capacity of wires with different cross-sectional areas is as follows: -1.5mm ² wire has a current carrying capacity of 18A, -2.5mm ² wire has a current carrying capacity of 26A, -4mm ² wire has a current carrying capacity of 26A, -6mm ² wire has a current carrying capacity of 47A, -10mm ² wire has a current carrying capacity of 66A, -16mm ² wire has a current carrying capacity of 92A, -25mm ² wire has a current carrying capacity of 120A, and -35mm ² wire has a current carrying capacity of 150A. Taking power P as an example, the calculation formula is P=voltage U × current I. Assuming a voltage of 220 volts and a current of 18 amperes, the power P is 3960 watts

4. Standard GB4706.1-1992/1998 It also stipulates the allowable long-term current values for copper core wires and aluminum core wires: - Copper core wires:

2. How to calculate the current carrying capacity of a wire?

The recommended formula for calculating the current carrying capacity of a conductor in the International Electrotechnical Commission standard IEC 60287 is as follows: In the formula: I: Current carrying capacity (A) Δθ: Difference between conductor temperature and ambient temperature (℃) R: AC resistance of the conductor at 90 ℃ (Ω/m) N: Number of current carrying conductors in the cable Wd: Insulation medium loss λ 1: Sheath and shielding loss factor λ 2: Metal armor loss factor T1: Thermal resistance of the insulation layer between the conductor cage and the metal sheath (K · m/W) T2: Thermal resistance of the inner lining layer between the metal sheath and the armor layer (K · m/W) T3: Thermal resistance of the outer sheath layer of the cable (K · m/W) T4: Surface and surrounding of the cable Thermal resistance between media (K · m/W)

3. How to calculate the current carrying capacity of wires? The calculation formula is as follows:; Calculation formula, Q=ρ*I*I/A(W/m)。 The value of

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