Vid wire sizes

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benmin

Senior Member
Location
Maine
Occupation
Master Electrician
Just checking to make sure I am doing this right. 69fla VFD powering a 7.5hp motor. Feeding the VFD with #3 CU single phase and the 3 phase 7.5 motor output in #8. Is my conductor sizing correct?
 

kwired

Electron manager
Location
NE Nebraska
Seems to be about right to comply with NEC as the supply to the drive must be sized to the input rating of the drive, but here is where I question the requirements - the reality of this install is the supply side likely only sees about 40 amps max, I myself have no issue with smaller supply conductors if they are properly protected.

Your output conductors possibly can be 10 AWG.
 
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