25% of largest motor load contribution

[anbm]

when we calculate total building load and submit to city plan examiner to review the drawings, under building load summary page, we have to include 25% of largest motor load.

I am wondering if this 25% of largest motor load only applies once at the total building load
or we have to apply this rule to all branch panels which has motor load? Thank you.

 

[suemarkp]

It applies once to the Service.
It applies once to each Feeder.
It applies to each Branch Circuit.

May be a different "largest motor" on the feeders and branch circuits though, and feeders and branch circuits with no motors can have a 0 here.

 

[Smart $]

Applies to every circuit conductor individually, whether service, feeder, or branch circuit... using whichever motor is the largest supplied by the circuit. Largest motor on a circuit conductor is determined using its FLC value, not HP or kW rating.