Electrical cable sizing is the process of selecting the optimal conductor cross-sectional area (e.g., 1.5 mm², 4 mm², 70 mm²) for a given load and installation condition. Undersizing leads to overheating, insulation failure, fire, or excessive voltage drop. Oversizing wastes copper, increases material cost, and complicates installation.
Maximum allowable voltage drop is typically: electrical cable sizing
: 6 mm² for ampacity, but 16 mm² for fault → final size = 16 mm². Electrical cable sizing is the process of selecting