Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Weird questions about short circuit current capacity

  1. Feb 19, 2016 #1
    Hi friends ,

    today we are just general talking with my boss. and he asked me a question . and that is,

    if we have equipment that is rated short circuit current is 40kA. for 1 sec. and if we must have to use that same equipment for 3 sec time. that how much short circuit current they can sustain for 03 sec time, definitely below than 40kA. but how much with respect to time ie 3 sec. let say 10kA , 20kA , 30kA, or 39.8kA. ..

    this is completely just discussion not practically by any mean please.

  2. jcsd
  3. Feb 19, 2016 #2


    User Avatar
    Gold Member

    Completely indeterminate given the information you have provided. It's going to depend on the specifics of the particular equipment.
  4. Feb 19, 2016 #3

    jim hardy

    User Avatar
    Science Advisor
    Gold Member

  5. Feb 20, 2016 #4
    For something that burns, heat is developed by I2R. Lots of equipment will fail in this mode, but it's not the only failure mode.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Weird questions about short circuit current capacity