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  1. mshSnow

    Ground ring installation

    Waross...this is correct. Both buildings are owned by one party, and all power sources are in existing buildings. It just would save time/cost to not have to trench and locate existing ground ring. From answers here, it seems like there is no reason why we can't use other means of grounding such...
  2. mshSnow

    Ground ring installation

    The engineer who designed the electrical system for a new facility we'really building had new grounding ring connected to near by building ground grid. Is there any code requirement for this? Can we just have that connected to a different grounding source such as a column? I do not see anything...
  3. mshSnow

    VFD/Motor speed reduction

    Thanks jraef...that makes sense!
  4. mshSnow

    VFD/Motor speed reduction

    Hello all! We have a situation where a 200HP, 480v motor controlled by VFD needs to have it's max speed limited to 54Hz. This is a fan motor (variable HP and Torque), so as I understand, if speed is reduced to 90%, the HP is reduced to (90%*90%*90%) = 72.9%, and Torque to 81%. But this is what...

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