Answer / Vikas Trivedi

To determine the cable size for a 5MW load at 11kV over a distance of 900 feet using aluminum conductors, you can use the American Wire Gauge (AWG) chart or the tables provided in standards such as IEC 60228 or NEC. Here is an example calculation based on IEC 60228-1:

1. Determine the total current (I): I = P / U = 5000000 W / 11000 V = 454.55 A
2. Find the allowable thermal rise per unit length (αl) for aluminum conductors at the specified ambient temperature: For example, at 35°C and 900 feet, αl = 0.01687 °C/m
3. Determine the allowable current density (J): J = I / (π * d²) where d is the conductor diameter
4. Find the required cross-sectional area (A): A = I / (J * π)
5. Look up the corresponding AWG number for a cable with the calculated cross-sectional area from a table or chart

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