User Tag List

Results 1 to 10 of 10

Thread: LIVESTOCK EQUIPOTENTIAL PLANES

  1. #1
    Join Date
    Aug 2013
    Location
    Marion, Illinois
    Posts
    9
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    LIVESTOCK EQUIPOTENTIAL PLANES

    I am in the process of designing a veterinary building that includes separate bovine and equine buildings. The equine building has gravel stalls with concrete corridors leading to the stalls. The bovine building has concrete floors throughout.

    I have studied NEC 547 and the American Society of Agricultural and Biological Engineers standard EP473 regarding equipotential planes and cannot get a warm fuzzy feeling about veterinary use buildings needing a equipotential plane due to the temporary, transient use. We will, of course, bond all metallic equipment that the animals can come into contact with but the actual concrete slab equipotential plane and voltage gradient ramps seem excessive for this building/use type.

    Thoughts are extremely appreciated!!!

    Jeffrey
    Marion, IL

  2. #2
    Join Date
    Dec 2006
    Location
    Chapel Hill, NC
    Posts
    34,742
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Mike holt has a great video on stray voltage and agriculture equipotential plane. If you don't want to watch it all begin watching at 45 minutes

    They say I shot a man named Gray and took his wife to Italy
    She inherited a million bucks and when she died it came to me
    I can't help it if I'm lucky



  3. #3
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    6,646
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by AZJeff2013 View Post
    I am in the process of designing a veterinary building that includes separate bovine and equine buildings. The equine building has gravel stalls with concrete corridors leading to the stalls. The bovine building has concrete floors throughout.

    I have studied NEC 547 and the American Society of Agricultural and Biological Engineers standard EP473 regarding equipotential planes and cannot get a warm fuzzy feeling about veterinary use buildings needing a equipotential plane due to the temporary, transient use. We will, of course, bond all metallic equipment that the animals can come into contact with but the actual concrete slab equipotential plane and voltage gradient ramps seem excessive for this building/use type.

    Thoughts are extremely appreciated!!!

    Jeffrey
    Marion, IL
    Well, unless you can guarantee that any faults will be temporary and transient, I think the standards don't care if the animal will be there 10 hours or 10 weeks. Suppose it was your prize stud bull going in for care, how would you feel about your animal not being protected according to code, just because "it's only a little while"?

  4. #4
    Join Date
    Dec 2006
    Location
    Eastern Oregon
    Posts
    3,787
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    We've done miles of equipotential plane work in large dairy barns. It's not complicated once you start doing it. Repetitive more than anything, really.

    Just make sure they use wire mesh or rebar in a grid before pouring the concrete. We use DB/grounding rated split bolts, IK-6's if I remember right for most all of our work. Used crimps for a while, found out we like split bolts more. The barns we do are 2200' long typically, so a roll of mesh doesn't make it the whole distance. We typically split bolt the end of one mesh to the next and throw a couple split bolts down the side to the adjacent mesh. This is above and beyond what the NEC requires though.

    We bond anything isolated and metallic that is set in the slabs, metal fencing, gate posts, headlocks/stanchions, etc.

    We typically use:
    #8 bare solid CU
    DB ufer clamps
    IK-6's
    #4 DB lay in lugs

    Some combination of the above will carry us all the way through an equipotential plane project.

    Just an FYI, when our regular inspector isn't available, the replacement or substitute inspectors don't even know what they're looking at when we show them the equipotential plane. The majority of electricians don't ever come in contact with art. 547 and as such, either do most inspectors.

    Get ready to explain what you're doing so the inspector understands.

  5. #5
    Join Date
    Feb 2003
    Location
    Bremerton, Washington
    Posts
    8,177
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    2200 feet thats a lot of dairy.
    Moderator-Washington State
    Ancora Imparo

  6. #6
    Join Date
    Mar 2003
    Location
    Vermont
    Posts
    2,517
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Cow View Post

    Just an FYI, when our regular inspector isn't available, the replacement or substitute inspectors don't even know what they're looking at when we show them the equipotential plane. The majority of electricians don't ever come in contact with art. 547 and as such, either do most inspectors.

    Get ready to explain what you're doing so the inspector understands.
    My entire 'farm' career Cow

    thx

    ~RJ~

  7. #7
    Join Date
    Mar 2014
    Location
    Park Ridge, NJ
    Posts
    156
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Cow View Post
    We've done miles of equipotential plane work in large dairy barns. It's not complicated once you start doing it. Repetitive more than anything, really.

    Just make sure they use wire mesh or rebar in a grid before pouring the concrete. We use DB/grounding rated split bolts, IK-6's if I remember right for most all of our work. Used crimps for a while, found out we like split bolts more. The barns we do are 2200' long typically, so a roll of mesh doesn't make it the whole distance. We typically split bolt the end of one mesh to the next and throw a couple split bolts down the side to the adjacent mesh. This is above and beyond what the NEC requires though.

    We bond anything isolated and metallic that is set in the slabs, metal fencing, gate posts, headlocks/stanchions, etc.

    We typically use:
    #8 bare solid CU
    DB ufer clamps
    IK-6's
    #4 DB lay in lugs


    Some combination of the above will carry us all the way through an equipotential plane project.

    Just an FYI, when our regular inspector isn't available, the replacement or substitute inspectors don't even know what they're looking at when we show them the equipotential plane. The majority of electricians don't ever come in contact with art. 547 and as such, either do most inspectors.

    Get ready to explain what you're doing so the inspector understands.

    This method of bonding really is not much, if at all, different then when we pour a concrete slab in prep for a natural stone finish or a finished poured concrete patio around a pool. We'll use #4 (1/2") rebar or wire mesh-depends on project application and size.

  8. #8
    Join Date
    Dec 2006
    Location
    Eastern Oregon
    Posts
    3,787
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Mystic Pools View Post
    This method of bonding really is not much, if at all, different then when we pour a concrete slab in prep for a natural stone finish or a finished poured concrete patio around a pool. We'll use #4 (1/2") rebar or wire mesh-depends on project application and size.
    I've never done a pool, but I'll bet what you're saying is true. It can't be far off from what a pool takes.

  9. #9
    Join Date
    Jun 2003
    Location
    NE (9.06 miles @5.9 Degrees from Winged Horses)
    Posts
    11,260
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Don’t ignore the gradient ramps on both the entrance AND exits. You will have a pretty good visual of why.
    Tom
    TBLO

  10. #10
    Join Date
    Dec 2007
    Location
    NE Nebraska
    Posts
    41,338
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Mystic Pools View Post
    This method of bonding really is not much, if at all, different then when we pour a concrete slab in prep for a natural stone finish or a finished poured concrete patio around a pool. We'll use #4 (1/2") rebar or wire mesh-depends on project application and size.
    Except you don't ordinarily have gradient ramps at pools. But look at how much more surface area a large animal like a cow can span across (that much more potential voltage when there is a gradient present) compared to humans when just casually standing or walking.

    Quote Originally Posted by ptonsparky View Post
    Don’t ignore the gradient ramps on both the entrance AND exits. You will have a pretty good visual of why.
    I live for today, I'm just a day behind.

Tags for this Thread

Posting Permissions

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