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Thread: 400 amp service grounding

  1. #11
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    Quote Originally Posted by electrofelon View Post
    Why can't I use an approved raceway as the fault path at a service? Bonding to the neutral is one option but I believe bonding jumpers or raceways are acceptable as well. Consider a metal pull box, them RGS raceway, then bonded panelboard. Couldn't the RGS bond the box?
    On supply side of service disconnect, every enclosure will have a bond to the grounded conductor - any raceways between them just need something more then standard locknut to assure they are bonded, and only need bonded in one place. You could even put a pipe bonding clamp on it outside the box and bond it via that if you wanted - many seem to think bonding bushings are the only way to do this.
    I live for today, I'm just a day behind.

  2. #12
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    Quote Originally Posted by kwired View Post
    On supply side of service disconnect, every enclosure will have a bond to the grounded conductor
    But not necessarily "directly" to the grounded conductor. Wire binding Jumpers and raceways are allowed. If I use a raceway, I need service bonding on both ends, IMO.
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

  3. #13
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    Quote Originally Posted by electrofelon View Post
    But not necessarily "directly" to the grounded conductor
    Service equipment has to have a direct connection to the grounded conductor.
    Wire binding Jumpers and raceways are allowed. If I use a raceway, I need service bonding on both ends, IMO.
    That is not correct, one end of the raceway is all that needs an extra connection beyond a lock ring.
    If you don't think too good, don't think too much.

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    Quote Originally Posted by rojay View Post
    So then the only time the NEC would require bonding at both ends of a service raceway would be in the case of concentric/eccentric ko’s at both ends?
    Only required if the service raceway contains a grounding electrode conductor, to be bonded at each end.
    For con/ecc KOs only one end of the raceway is bonded, to provide a fault current return path to the source.
    Moderator-Washington State
    Ancora Imparo

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    Quote Originally Posted by ActionDave View Post
    Service equipment has to have a direct connection to the grounded conductor.
    I am not seeing such a requirement anywhere. Could you cite a code section that prohibits use of bonding jumpers and raceways to bond a service enclosure?
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

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    Quote Originally Posted by electrofelon View Post
    I am not seeing such a requirement anywhere. Could you cite a code section that prohibits use of bonding jumpers and raceways to bond a service enclosure?
    250.80 is vague enough I guess one can interpret it that way.
    I live for today, I'm just a day behind.

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    Quote Originally Posted by electrofelon View Post
    I am not seeing such a requirement anywhere. Could you cite a code section that prohibits use of bonding jumpers and raceways to bond a service enclosure?
    It's all part of that suitable for use as service equipment thing.
    If you don't think too good, don't think too much.

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    Quote Originally Posted by ActionDave View Post
    It's all part of that suitable for use as service equipment thing.
    I think what you are thinking of has to do with equipment where there is a service disconnect which would require a MBJ, grounded conductor brought to service equipment, etc. Consider a metal pull box or wireway.
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

  9. #19
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    Quote Originally Posted by electrofelon View Post
    I think what you are thinking of has to do with equipment where there is a service disconnect which would require a MBJ, grounded conductor brought to service equipment, etc. Consider a metal pull box or wireway.
    I have always bonded them to the grounded conductor when it is service conductors - but I suppose you could rely on a metal raceway as long as it isn't solely depending on a standard locknut for that bonding path.
    I live for today, I'm just a day behind.

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