Large Motor FLC

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dickricker

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Eugene, Oregon, USA
NEC 2011, Table 430.250 only goes to 500 HP.
I have heard that for larger 460 VAC motors, use 1.2 FLC per HP, or exterpolate. But I cannot find a reference.
Please, what is the official NEC rule for determining FLC for motors larger than 500 HP?
Thank You!
 
augie47 said:
CHeck this document, especially Pg 33

http://www.baldor.com/support/Literature/Load.ashx/BR435?LitNumber=BR435
Click to expand...

Page 33 lists the nameplate FLA of large 460 VAC motors --- Thank You!

However, NEC Article 430.6 says that Tables 430.247 - 430.250 must be used to determine the ampacity of the motor conductors, not the nameplate FLA.

It goes on to say that interpolation should be used when going from amps to HP; but interpolation is not mentioned for determining FLC.
 
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