Determining motor ampacity for motors greater than 500 Horespower

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Electron_Sam78

Senior Member
Location
Palm Bay, FL
Hey all,

The tables specified in section 430.6 to determine motor ampacity only go to 500 horsepower (T430.250 in my case). If have a 657 HP motor I assume I use the data plate amperage? I can't find anything in the book that addresses this.
 
So if this disconnect needed to be between the VFD and the motor am I to understand the NEC doesn't have guidance for this as far as determing motor ampacity? So revert to data plate ratings?
 
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