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Thread: Grounding bushing?

  1. #11
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    Jul 2003
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    Quote Originally Posted by Carultch View Post
    Do you know any examples of equipment with ring KO's that are listed for 277V or 277/480V bonding? I'd like to see how this is noted on a datasheet. I understand that these will be a lot more heavy duty than ordinary knockouts, and more difficult to remove.
    There was a thread a while ago where someone posted a reference to the KO's in disconnect switches not be tested as suitable for grounding over 250 volts. Most 1900 and 4 11/16 boxes that I've seen are so listed.
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

  2. #12
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    Quote Originally Posted by infinity View Post
    There was a thread a while ago where someone posted a reference to the KO's in disconnect switches not be tested as suitable for grounding over 250 volts. Most 1900 and 4 11/16 boxes that I've seen are so listed.
    Datasheet link please.

  3. #13
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    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  4. #14
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    Jul 2005
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    If you look at Pg A-14 it notes boxes that are approved for 600v application without bonding jumpers.
    http://www.hubbell-rtb.com/literatur...ccessories.pdf
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

  5. #15
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    Quote Originally Posted by augie47 View Post
    If you look at Pg A-14 it notes boxes that are approved for 600v application without bonding jumpers.
    http://www.hubbell-rtb.com/literatur...ccessories.pdf
    Thanks Augie. I knew these existed in concept, but I wasn't really sure how I would find one in a product search, or know how to confirm it on the product markings.

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