User Tag List

Results 1 to 6 of 6

Thread: ground fault study

  1. #1
    Join Date
    Dec 2008
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    ground fault study

    where would I be able to find information about a "ground fault study" for electrical gear. I am trying to understand how this works as well as how to properly determine the corrective "cal for PPE" thanks in advance

  2. #2
    Join Date
    Feb 2009
    Location
    Allentown, PA
    Posts
    401
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You mean Arc Flash study. You need to hire an engineering company to perform the study. It isn't a simple lookup table. The engineering company with determine the incident energy after doing a plantwide survey. From there you can look at NFPA 70E 2009 section 130 to determine what you should wear based on the voltage and incident energy.

    Read over Section 130 it is available online for free below.

    NFPA 70E
    http://nfpaweb3.gvpi.net/rrserver/br.../NFPASTD/70E09

  3. #3
    Join Date
    Jun 2009
    Location
    North Florida
    Posts
    119
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    There are tables available to use if your facility meets certain requirements. In order to determine if you meet those requirements, you will need information from the utility and information about your distribution system to do a basic calculation. If you fall into the requirements, you can use the tables found in 70E and label your equipment accordingly. If not, you will need to do a full arc flash study and then apply labels based on that. In either case, you will probably need to employ an outiside engineer to do the basic calculation. Just make sure you understand that an option is available if you fit, and the high cost of an arc flash study may not be necessary.

    TxEngr

  4. #4
    Join Date
    Jun 2009
    Location
    New Paris, OH
    Posts
    6
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Might need short circuit & coordination study's

    Depending on your location and what you are doing, OSHA requires a documented short circuit & coordination study.
    1910.303(b)(4) & (5)
    Then you will know if you can follow the tables or need a complete Arc Flash study completed. Granted, OSHA put in several exceptions but most of the commerical / industrial facilities will need this.

  5. #5
    Join Date
    May 2003
    Location
    Leesburg, VA
    Posts
    7,108
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If you want to know more about Ground Fault ryou can read this,


    http://www.electriciantalk.com/f2/ad...lt-issues-483/
    Brian John
    Leesburg, VA

  6. #6
    Join Date
    Dec 2008
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    arc flash

    thanks for your help all, appreciate it

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •