430.24 + 621.14 - elevator motor feeder sizing

Location
TX, USA
I hope this is a simple question on the approach to elevator motor feeder sizing.

Does one combine the effects of 430.24 (motor feeder circuit = 125% of the largest motor current + sum of other motor currents) with 621.14 (demand factor for elevators).

E.g., so if I have 5 elevators that have currents 20, 10, 5, 5, 3... I'd end up with : 82% * (20 * 125% + 10 + 5 + 5 + 3).

Thx
 

Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
That is my understanding on how it is done. 125% of the largest plus the sum of the other motors. Then, of course, there is a demand factor for 5 elevators of 82%.

Looks like you have it right.
 
Top