Forums » Electrical Engineering

Neutral grounding

    • 3 posts
    August 29, 2019 12:47 PM PDT

    We have a system needing neutral grounding, and lead times are way out. Can an existing pad mount transformer be reconfigured for Zig-Zag or grounding neutral configuration?

    • 75 posts
    August 29, 2019 1:34 PM PDT

    Is the existing transformer secondary Ungrounded-Wye or Delta?  Likely a dumb question.  If it were not Delta, you wouldn't be asking.


    Assuming it is ungrounded Delta, and the system is not something screwie, like corner grounded, then yes.


    Unless there is a rest-of-the-story.  In which case you need to enlighten us



    • 75 posts
    August 29, 2019 1:44 PM PDT

    Just thinking:

    If the issue is needing 40/277, grounded wye for lighting, heat trace or the like.

    One common method is to scatter 75KVA 480Dd/480Y transformers around the plant and feed a 100A 480/277 panel.  Those small xfm are not usually long lead

    And I'm thinking you probably already knew this.