Back feeding a 480 v / 208v 3 phase step down transformer what about the neutral

Discussion in 'The Projects Forum' started by MGMimsimssr, Aug 4, 2016.

  1. MGMimsimssr

    Thread Starter New Member

    Aug 4, 2016
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    When back feeding a Step Down Transformer to achieve a higher voltage how should the neutral and grounding and bonding be addressed since the neutrals ls on the secondary side originally but now will be on the primary side
     
  2. nsaspook

    AAC Fanatic!

    Aug 27, 2009
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  3. MGMimsimssr

    Thread Starter New Member

    Aug 4, 2016
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    I was referring to the standard 480-volt Delta to 120 208 y Dry type Transformers normally used in commercial facilities to step down power
    After reading the information you suggested I do understand we need a 480-volt Wye 120 208 y or Delta so that when we feed the Transformer with the 208v 3p power we will have a 480v neutral on the secondary side to refeed the existing 480-volt electrical panel.
    Thanks
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    What are you feeding from the 480 secondary that requires a neutral?
    Do you actually need a neutral?
    Max.
     
  5. MGMimsimssr

    Thread Starter New Member

    Aug 4, 2016
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    Yes there are some 277 lighting circuits being feed from the existing 480-volt panel.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Last edited: Aug 5, 2016
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