Results 1 to 4 of 4

Thread: Where to connect Grounding Electrode Conductor in transformer?

  1. #1
    Join Date
    Dec 2016
    Location
    New York
    Posts
    4

    Where to connect Grounding Electrode Conductor in transformer?

    Hello,

    The Grounding Electrode Conductor connects to building steel or water main at one end. Does the other end connect to "X0" of transformer or ground bar of the transformer?

    Thank you.

  2. #2
    Join Date
    Aug 2004
    Location
    Northern illinois
    Posts
    15,650
    Quote Originally Posted by AungYe View Post
    Hello,

    The Grounding Electrode Conductor connects to building steel or water main at one end. Does the other end connect to "X0" of transformer or ground bar of the transformer?

    Thank you.
    If the xfmr is NOT creating an SDS it has to go to the ground bar and cannot be connected to X0. However, if it is not an SDS, a GEC may not be required.

    If the xfmr is creating an SDS it would probably be simplest to run it to X0 but the code allows a bar (within certain parameters) to be part of the GEC so it could go to the ground bar first and than to X0.
    Bob

  3. #3
    Join Date
    Feb 2009
    Location
    Durango, CO, 10 h 20 min without traffic from winged horses.
    Posts
    8,747
    Quote Originally Posted by AungYe View Post
    Hello,

    The Grounding Electrode Conductor connects to building steel or water main at one end. Does the other end connect to "X0" of transformer or ground bar of the transformer?

    Thank you.
    Code allows the XO to be bonded in the transformer case or in the first disconnect, the grounding electrode conductor goes to the same location as the bond.
    Once in a while you get shown the light
    In the strangest of places if you look at it right. Robert Hunter

  4. #4
    Join Date
    Jul 2003
    Location
    New Jersey
    Posts
    23,764
    The GEC can terminate to the ground bar within the transformer if the system bonding jumper (wire or bus bar) from the X0 also is terminated there. {250.30(A)(5)Ex#1}

    This graphic is old but still relevant:

    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •