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Thread: Fence gate 24' no underground bond

  1. #1
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    Fence gate 24' no underground bond



    Would Spring Retractable Grounding Reel

    Be legal in this case?


    Sent from my iPhone using Tapatalk

  2. #2
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    Can you provide more info as to why the fence needs to be bonded?
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  3. #3
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    I'm curious as well. Is the gate isolated from the fence by the rollers? If you wanted to bond the gate to the fence, what you have pictured should work if permanently attached.

    How do you know the sections arent bonded underground? Are people getting shocked when touching the gate? Is there potential between fence sections?
    Electricians do it until it Hertz!

  4. #4
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    Is a Gemasolar Plant and on the specs show that the fence should be bonded by substation fence requirements... And We receive a claim from the client that it was no done at the entrance gates.


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  5. #5
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    Are you talking about a jumper or bond across the gate opening from post to post on each side of the opening?

    -Hal

  6. #6
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    To be clear- this is not an NEC requirement this is a client requirement unless the system is defined as having 'exposed, energized parts' which I doubt a bunch of mirrors have. If this is actually a substation it's important to state that.

    If the requirement is to ground each corner do that, if the requirement is to bond the gate to the fence, doing that with the product you showed will probably do the job. If you need to bond the fence posts together, well I think you ought to revisit the reason someone is asking you for a bonding jumper. If it's not stated on contract documents I would expect a change order for that work because it is not an electrical code requirement and you're going to have to dig up that road probably. See if you can lump that change order in with a loop detector system or something... just an idea

  7. #7
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    It's not necessary to dig up the road.
    https://www.borit.com/

    As for bonding the gate, it all depends on what the client requirement is. If the requirement is that the bonding system be able to carry fault current and open a breaker, a spring-retractable grounding reel (with carbon brushes) probably isn't adequate. They're most often used on aircraft-fueling trucks, where it's only necessary to dissipate a static-electricity charge. You might need a bond wire in a cable carrier, and it will need to be more flexible than a 7- or 19-strand.
    http://www.dynatect.com/cable-hose-c...ation-examples

  8. #8
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    Hypothetically, could you go aerial with a bonding jumper here?

    [QUOTE=drcampbell;1854591]It's not necessary to dig up the road.
    https://www.borit.com/

    With my luck I'd hit a piece of lv, irrigation, or telephony cable in that 20'. But neat device.
    Last edited by JFletcher; 08-26-17 at 10:29 PM.
    Electricians do it until it Hertz!

  9. #9
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    Quote Originally Posted by JFletcher View Post
    Hypothetically, could you go aerial with a bonding jumper here? ...
    If it's adequately supported and adequately protected from physical damage & lightning strikes, I don't see why not, even if "overhead ground wire" is a bit of a non sequitur.

  10. #10
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    Quote Originally Posted by drcampbell View Post
    If it's adequately supported and adequately protected from physical damage & lightning strikes, I don't see why not, even if "overhead ground wire" is a bit of a non sequitur.
    Well it's a bonding wire, not a ground.

    Aside from contractual obligations, I'm failing to see why the gate would need to be grounded or bonded at all. If there's a fault in the drive motor, its EGC should provide protection. If you happen to be touching any of it during a lightning strike, if all that metal post in the ground isnt sufficient for protection, neither is bonding. Is someone going to manually operate it using one of the fence sections as leverage (i.e., potential between two conductive objects?) Are there some kind of inductive currents/voltage present at a substation or solar farm or special hazards of fences of which I am unaware?
    Electricians do it until it Hertz!

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