670.3 Machine Nameplate Data

[Kiljoy]

This section of the NEC tells how to calculate full load amps of multi-motor equipment. I understand how this works, I know when to use the FLA tables for wire sizing etc. My question: When listing the FLA on a piece of equipment and/or wiring diagram, do you use the actual motor nameplate or the FLA tables? I am often asked the full load amps of our equipment, and I'm not sure whether I should answer with theoretical (FLA tables) or actual (calculated from motor nameplates). Thanks!

 

[waross]

If I understand the question;
Use motor nameplate FLA.
List minimum circuit ampacity from calculations.

Bill
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"Why not the best?"
Jimmy Carter

 

[Kiljoy]

That's what I've typically done in the past. But the then FLA would change if someone replaced a motor with a higher FLA one. That's why I was confused. The end user obviously uses our nameplate to size their feeder and breaker/disconnect. To add a bit into to the mix, we sometimes use part of the service factor of the motor. I'm thinking that falls under the "unusual load" clause. Thanks for the input!