Manual three-phase cable sizing check

Calculates theoretical line current from active power, line voltage and power factor.

Calculates simplified voltage drop in a balanced three-phase system from per-length parameters.

Helper calculation for simplified three-phase voltage drop from resistivity and area; it does not replace standards-based calculations.

Converts voltage drop to a percentage of nominal voltage.

Calculates theoretical wire resistance from resistivity, length and cross-sectional area.

Multiplies the manually provided base ampacity Iz by a correction factor.