Industrial machine supply conductor sizing

[deetz]

Looking at 670.4 in the NEC. It states that; The Nameplate provides the necessary information to size the branch circuit or feeder conductors, the machine disconnecting means,and overcurrent protection. The computation of motor and nonmotor loads is reflected on the nameplate as full load amperes, and no further calculation is necessary. Do I still need to add the 125% for supply conductor sizing?

 

[dpc]

Yes. 125% for largest motor and all other continuous loads. Duty cycle can be applied to other motor loads per Article 430 (if applicable).

 

[waross]

The Nameplate provides the necessary information to size the branch circuit or feeder conductors,

Typical wording;
"Use supply conductors suitable for xxx Amps". No calculation needed.
If this is not included on the name plate and only;
"full load amperes" is shown, then use 125% for motorized equipment.



Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[deetz]

Good point waross. Yeah the book and it's wording get's me alot. I either read too much into it or not enough. Thanks and Happy New Year.