Electric motor calc

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augie47

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Staff member
Location
Tennessee
Occupation
State Electrical Inspector (Retired)
I would think for a test question, the answer would lie in Table 430.250
 

kwired

Electron manager
Location
NE Nebraska
Really need to know exactly what the wording of the question is. Most likely for the test they were looking for what minimum ampacity of feeder conductor is needed for those three motors.

As far as a reality of what the three motors would actually draw - it depends on the load being driven. Just because they are 10 HP motors doesn't mean they are loaded to 10HP. They are likely loaded more then 7.5 at least some of the time though otherwise 7.5 HP motors may have been selected for the application.
 
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