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Thread: 250.118 - using emt conduit as a ground

  1. #11
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    Pulling a wire type EGC is more about a backup or assured bonding.

    Much like a safety chain installed on a perfectly supported pendant fixture.

    JAP>

  2. #12
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    Plus, dropping that one conductor when emt is used, helps somewhat for the added conductors we now have to add for MWBC's that we didn't used to have to install.

    That is for us old dogs that always used MWBC's and now don't like tying individual circuit handles together.

    JAP>

  3. #13
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    Quote Originally Posted by jap View Post
    Pulling a wire type EGC is more about a backup or assured bonding.

    Much like a safety chain installed on a perfectly supported pendant fixture.

    JAP>
    Which NEC only requires additional paths for certain art 517 applications (could be other specific sections but am not aware of any), outside of that it is a design decision.
    I live for today, I'm just a day behind.

  4. #14
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    Quote Originally Posted by kwired View Post
    Which NEC only requires additional paths for certain art 517 applications (could be other specific sections but am not aware of any), outside of that it is a design decision.
    If the raceway is so good as an EGC why is there ever a need for redundant grounding? Needs to be extra good?
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

  5. #15
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    Quote Originally Posted by infinity View Post
    If the raceway is so good as an EGC why is there ever a need for redundant grounding? Needs to be extra good?
    I didn't write the rule, apparently it knows when it is in a health care facility and gets nervous or something
    I live for today, I'm just a day behind.

  6. #16
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    Haven't seen EMT used for any installations since I was doing my apprenticeship in the 1840s....and even then we had to run a separate earth (grounding) conductor...

  7. #17
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    Quote Originally Posted by Besoeker3 View Post
    Haven't seen EMT used for any installations since I was doing my apprenticeship in the 1840s....and even then we had to run a separate earth (grounding) conductor...
    Man..... you're OLD!!!!!!!

  8. #18
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    Quote Originally Posted by 480sparky View Post
    Man..... you're OLD!!!!!!!
    What did you say????

  9. #19
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    Quote Originally Posted by infinity View Post
    If the raceway is so good as an EGC why is there ever a need for redundant grounding? Needs to be extra good?
    Pfft, not only do I run a ground on the inside, I run one on the outside as well.

  10. #20
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    Quote Originally Posted by kwired View Post
    Seen many from the time period you mentioned with poorly supported raceway contributing to broken fittings resulting in loss of EGC, also seen loose set screws or compression nuts, but that is all workmanship issues more than anything IMO. Have seen poorly made up EGC's in cable wiring methods as well - open continuity is still open continuity.

    I do a lot of grain storage bins and handling equipment. Generally all steel structures and equipment. I do run EGC's in flexible conduits or in any non metallic raceways (which is usually just underground raceways in these applications) but see running any wire EGC in most of said systems as pointless, the equipment/structures are very effective fault return path, and usually more effective than my raceways, so if a fitting didn't get tightened it doesn't really matter much from equipment grounding perspective.
    Agree, if set screws are tight then your are good to go, but Ive come across installations [done by others] with duck tape used for couplings.

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