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  1. harbee

    Transformer Overloading-Inrush

    I have a 7.5 MVA, 46kV-4.16 kV transformer that feeds (2)-1200 HP motor and 1500 kVA worth of auxiliary loads (Overall load~3900 kVA). I am upgrading one of the 1200 HP motor to 1600 HP. At worst case condition, having 1200 HP running and 1600 HP starting the kVA at inrush is around 11000 kVA...
  2. harbee

    Designing a 480 V panel

    Thanks all for your comments. Appreciate your help.
  3. harbee

    Designing a 480 V panel

    Exactly. Well, I would go with MLO panel and have a 200 A fused disconnect. Thanks for your help DrWeig.
  4. harbee

    Designing a 480 V panel

    DRWeig, Thanks for your feedback. I cannot use a main lug only panel since the 200 A breaker is 225 feet away. Locking out the equipment will be hard in this case.
  5. harbee

    Designing a 480 V panel

    I designed a 480 V panel that will have total connected load of 160 A. The main breaker I specified for this panel was 250 A. But my supplier for the panel replied to me saying the minimum size of the main breaker in that panel that he can give is 400 A. On the other side, this 480 V panel will...

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