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It showed the resistance per thousand feet for #4 copper: 0.248 ohms.

A 3-phase induction motor rated at 15 kW, 400V, located 60 meters from the distribution board.

Voltage drop: 2.8% Maximum capacity: 70 Amps Upgrade to 2 AWG for 1% drop.

$$I_B \approx \frac{15000}{\sqrt{3} \times 400 \times 0.85 \times 0.9} \approx 28.3 \text{ Amps}$$

The thickness of an electrical cable, also known as its cross-sectional area, plays a significant role in determining its ability to carry current safely. A cable that is too thin can overheat, leading to energy losses, reduced system performance, and even pose a fire hazard. On the other hand, a cable that is too thick can be unnecessary, adding bulk and cost to the installation.