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Thread: Ground Lug hardware

  1. #1
    Join Date
    May 2010
    Posts
    111

    Ground Lug hardware

    If I am using a mechanical lug, to attach my ground wire to a metal enclosure. Is it legal to attach the lug to the metal enclosure using a course thread Tek screw? Or is a 32 thread per inch machine screw always required?

  2. #2
    Join Date
    Mar 2013
    Location
    Camarillo, CA
    Posts
    73
    250.8(5) Machine screw-type fasteners that engage not less than two threads or are secured with a nut.

    The fasteners should be of the material and type that will not corrode in contact with the enclosure for the Location and atmosphere.

  3. #3
    Join Date
    Jul 2003
    Location
    New Jersey
    Posts
    19,255
    Here's the list from 250.8 that MT posted. You could use a thread forming machine screw but not a standard TEK screw.

    250.8 Connection of Grounding and Bonding Equip-
    ment.
    (A) Permitted Methods. Equipment grounding conduc-
    tors, grounding electrode conductors, and bonding jumpers
    shall be connected by one of the following means:
    (1) Listed pressure connectors
    (2) Terminal bars
    (3) Pressure connectors listed as grounding and bonding
    equipment
    (4) Exothermic welding process
    (5) Machine screw-type fasteners that engage not less than
    two threads or are secured with a nut
    (6) Thread-forming machine screws that engage not less
    than two threads in the enclosure
    (7) Connections that are part of a listed assembly
    (8) Other listed means
    Rob

    Chief Moderator

    All responses based on the 2011 NEC unless otherwise noted

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