Calculating Motor Operating Costs

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JUSTEINEE

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Springfield
When coverting HP to KW does phase take account?

I have a situation where i was asked to calculate the running cost of having a 75 HP motor run for 80 hours.

I used KW=480VAC*100A*1.732/1000 to calculate my answer but when I asked my coworker if I was right he calculated cost using the equation 1 HP=746 W.

Which way is the right way to go about finding the solution, and why?
 
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