He needed thicker cable. But how thick? Too thin, fire. Too thick, he’d waste a fortune on copper he didn’t need and couldn't fit through the conduit.
Where:
A 3-phase induction motor rated at 15 kW, 400V, located 60 meters from the distribution board. electrical cable thickness calculator
"We need #4 THHN. 185 feet. And I’m going to need to cut a new trench to the panel." He needed thicker cable
$$I_Z \geq I_B$$
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