Motor Contribution

Status
Not open for further replies.

augie47

Moderator
Staff member
Location
Tennessee
Occupation
State Electrical Inspector (Retired)
On a current inspection, sometime in the distant future I will get a set of engineered drawings but I would like some preliminary input from you knowledgeable guys.
I have a 2000kva transformer 480/277 supplying (5) 400 HP motors controlled by soft-starts.
My SCA at the transformer is 43K. Individual services to each soft-start.
.SCA at the end of each service is about 31K. Approximately what will my motor contribution be ?
(do the motors on the other services effect the SCA on the one individual service, etc.)
 

Wrd4spd

Member
Location
Los Angeles
I built a quick model of your scenario and came up with 2773A of contribution from each 400HP motor service and 12500A total. A PDF of the model is attached, assuming I uploaded it correctly.
 

Attachments

  • Test-1.pdf
    11.3 KB · Views: 0
Status
Not open for further replies.
Top