This article was posted 03/03/2006 and is most likely outdated.

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Grounding vs Bonding: 250.70 Grounding Electrode Conductor Termination Fitting

March 3, 2006  

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PART III. GROUNDING ELECTRODE SYSTEM AND GROUNDING ELECTRODE CONDUCTOR  

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250.70 Grounding Electrode Conductor Termination Fitting.

The grounding electrode conductor must terminate to the grounding electrode by exothermic welding, listed lugs, listed pressure connectors, listed clamps, or other listed means. In addition, termination fittings must be listed for the materials of the grounding electrode.

When the termination to a grounding electrode is encased in concrete or buried, the termination fitting must be listed and identified for this purpose. No more than one conductor can terminate on a single clamp or fitting unless the clamp or fitting is listed for multiple connections. Figure 250–121



Figure 250–121
(Click on image to enlarge)

       

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Comments

  • Need help for wrought iron bonding connectors within 5' of body water. Is there a website that can help? Thanks, Lance

    Lance Sinclair
    Reply to this comment

    • Reply from: Mike Holt   
    Post your question on the Code Forum at www.MikeHolt.com.
    Reply to Mike Holt

  • Mike, I understand the issue but, shouldn't the violation arrow be pointing to the conductor at the bolt portion of the clamp. Also, many times I see the 2 conductors are side-by-side on the opposite side of the bolt where the single conductor is supposedly to be. Would this be a violation as well? Let me know.

    David Engelhart
    Reply to this comment

    • Reply from: Mike Culbreath   
    The violation on Figure 250-121 is that the acorn pressure connector is not listed for 2 conductors and that a separate fitting would be needed for the bonding jumper to the 2nd electrode. The graphic will be updated to reflect this point. Thanks for your input.

    Mike Culbreath Mike Holt Enterprises Technical Illustrator
    Reply to Mike Culbreath

  • mike if you loop a #4cu around a ground rod is this a violation also. Thank John ledger

    john h ledger
    Reply to this comment

    • Reply from: Mike Culbreath   
    The violation on Figure 250-121 is that the acorn pressure connector is not listed for 2 conductors and that a separate fitting would be needed for the bonding jumper to the 2nd electrode. The graphic will be updated to reflect this point. Thanks for your input.

    Adding a #4cu around the ground rod is not required by the NEC but I don't think it is a violation. It would not qualify as a ufer ground (not encased in concrete) so it wouldn't need a #4cu grounding electrode conductor. In fact, the #4cu looped around the ground rod might even decrease the contact resistance.

    Mike Culbreath Mike Holt Enterprises Technical Illustrator
    Reply to Mike Culbreath

  • The narrative for the grounding does not match the picture. The picture indicates that "No more than one conductor can terminate on a single termination". The text of the notice indicates that multiple conductors can be terminated if the fitting/clamp is listed for multiple connections.

    The pictures also notes that the termination of the left is a violation. It would only be a violation if the proper clamp was not used.

    tom

    Tom Christman
    Reply to this comment

    • Reply from: Mike Culbreath   
    You are correct. The violation on Figure 250-121 is that the acorn pressure connector is not listed for 2 conductors and that a separate fitting would be needed for the bonding jumper to the 2nd electrode. The graphic will be updated to reflect this point. Thanks for your input.

    Mike Culbreath Mike Holt Enterprises Technical Illustrator
    Reply to Mike Culbreath

  • I just want to be notified

    Edward Webb
    Reply to this comment

  • Is there ever an occasion where multiple GEC's can be connected under a single acorn connector?

    I inspected a condo building today with three separate meeters and disconnects...there was one ground rod with one Acorn and 3 GEC's connected to it.

    Thanks

    Peter Drenan
    Reply to this comment

    • Reply from: Mike Holt   
    Never, see 110.14(A) and 250.70.
    Reply to Mike Holt

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