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Use this formula to find amperage when kW is shown. Amps = kW x 1000/1.73 x Volts x pf. Use a power factor of .85 for the formula. Once the current is calculated re-ask the question for cable size for the calculated current.

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12y ago
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13y ago

A single conductor per phase will use a 3/0 copper conductor supplying 180 amps for 80 meters on a 400 volt three phase system. A 3/0 copper wire with an insulation rating of 75 and 90 degrees C is rated at 200 and 210 amps respectively.

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Q: What size power cable is needed for 30KW 440V 3phase 50Hz induction motor?
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