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Thread: Spacing For Copper Busbars

  1. #1

    Spacing For Copper Busbars

    engineers,

    what is the minimum spacing for copper busbar assembly

    where in NEC can i find it?

    thanks

  2. #2
    Join Date
    May 2004
    Location
    MA
    Posts
    1,472
    Spacing from what??

    Other bussor metal parts???
    try 408.56
    Charlie

  3. #3
    Join Date
    Oct 2005
    Location
    Las Vegas, NV
    Posts
    17
    Assuming you are talking about 480V assembly in switchgear, the recent manufacturer I worked for used insulated standoffs that were about 1" thick. The nominal clearance in air we used between uninsulated bus bar and a ground plane was 1" at 480V. When this clearance was not achievable, we would use a phenolic insulating material or insulating fiberboard such as Tufnol.

    See page 26, product on center of page on the following link.
    http://www.bowitt.com/insulating-par...t_Catalog.pdf/
    Ever stop to think, and forget to start again?

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