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You would need to know how FAR the load is from the service point. Then use an online calculator or the voltage-drop formula to determine the minimum diameter of the conductors necessary to provide 95 percent of the supply voltage to the device at the other end.

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If distance is not a factor, the wire size is determined by the amperage the wire has to carry. Using the formula I = W/E, Amps = Watts/Volts = 3000/380 = 7.98 amps.

A #14 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 15 amps. This size wire has nearly double the capacity that you need.

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Q: How do you figure wire size for a 3kW 380 volt?
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