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Thread: Grounding temporary panels

  1. #11
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    Illinois
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    Quote Originally Posted by petersonra View Post
    I agree the equipment is not"structure" but the stand they build to mount in on certainly is.
    I see the support for the panel as part of the equipment. I think the change in 2017 was aimed straight at things like this.
    Don, Illinois
    (All code citations are 2017 unless otherwise noted)

  2. #12
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    Quote Originally Posted by don_resqcapt19 View Post
    I see the support for the panel as part of the equipment. I think the change in 2017 was aimed straight at things like this.
    I agree, we're talking about a portable panel on a portable stand which is the support for the panel.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  3. #13
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    Quote Originally Posted by infinity View Post
    I agree, we're talking about a portable panel on a portable stand which is the support for the panel.
    Yep and said equipment is only going to be used in a limited capacity and for a short duration.
    "Electricity is really just organized lightning." George Carlin


    Derek

  4. #14
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    Quote Originally Posted by petersonra View Post
    Is a feeder allowed to be fed from a receptacle? Just curious.

    I agree it is a structure. You are probably going to have to create a grounding electrode system for each one. It will probably need to be two ground rods 6 feet apart. The irreversible connection requirement is going to make it messy.
    What irreversible connection are you talking about?
    A panel, ground rod and GEC doesn't require irreversible connections.
    If you aim at nothing, you will hit it every time!

  5. #15
    Join Date
    Dec 2004
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    Windsor, CO NEC: 2017
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    Quote Originally Posted by don_resqcapt19 View Post
    I see the support for the panel as part of the equipment. I think the change in 2017 was aimed straight at things like this.
    Agreed. The one good that came from the change.

  6. #16
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    Feb 2007
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    N/E Indiana
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    The change in definition would definitely be a bonus, however I am in one of those states that is still under the 2008 NEC. Since this is preliminary at this point for electrical demands, I am taking these comments to heart when reviewing the project. Have always appreciated the support from this site. Thank you.

  7. #17
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    Quote Originally Posted by petersonra View Post
    Is a feeder allowed to be fed from a receptacle? Just curious.
    Isn't that what you have with a mobile home (where allowed) or RV plugged into a 50 amp 120/240 volt receptacle

    Quote Originally Posted by infinity View Post
    I would call a panel on a stand equipment not a structure. The 2017 NEC clarified what classifies as a structure.
    I agree.

    Another thing I have run into is at the small community hospitals that haven't shelled out the $$$$ for MRI equipment around these parts, there are companies that have MRI equipment in a semi-trailer. I have hooked up an outlet to plug these into - the one's I have been involved with were a 200 amp 5 wire pin and sleeve device and carrying 480/277 to that trailer. IIRC we only had 150 amp OCPD on it, still didn't look all that fun to be the truck driver and pull out that heavy cable assembly to plug it in when he arrives.

  8. #18
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    Quote Originally Posted by kwired View Post

    Another thing I have run into is at the small community hospitals that haven't shelled out the $$$$ for MRI equipment around these parts, there are companies that have MRI equipment in a semi-trailer. I have hooked up an outlet to plug these into - the one's I have been involved with were a 200 amp 5 wire pin and sleeve device and carrying 480/277 to that trailer. IIRC we only had 150 amp OCPD on it, still didn't look all that fun to be the truck driver and pull out that heavy cable assembly to plug it in when he arrives.
    It would depend on the duration that trailor was planted there for me.

    The ones around my old medical place were there for awhile, talking 6-18 months during remodel.

    If it 30 days or more, I would be putting in a GES in that case.



    a
    "Electricity is really just organized lightning." George Carlin


    Derek

  9. #19
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    Quote Originally Posted by jumper View Post
    It would depend on the duration that trailor was planted there for me.

    The ones around my old medical place were there for awhile, talking 6-18 months during remodel.

    If it 30 days or more, I would be putting in a GES in that case.



    a
    These are only there for a few hours and then leave. May be there a couple times a week or so.

    Used to be a mobile CT scanner that came around and used the same outlet, but most the hospitals now have their own CT equipment.

    I never been inside trailer to know what is in there, and hope I never am - that probably means I'm the patient.

  10. #20
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    Quote Originally Posted by kwired View Post
    These are only there for a few hours and then leave. May be there a couple times a week or so.

    Used to be a mobile CT scanner that came around and used the same outlet, but most the hospitals now have their own CT equipment.

    I never been inside trailer to know what is in there, and hope I never am - that probably means I'm the patient.
    I have a vested interest. I am a patient.
    "Electricity is really just organized lightning." George Carlin


    Derek

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