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  1. tims924

    ETAP LV Circuit Breaker Opening Times

    Here is what I have seen in the past. The SKM Software has limitations that do not allow these delays to be entered under the following conditions. The two cases where you cannot change the breaker opening time in the arc flash evaluation: 1.) The fault current contribution is coming from an...
  2. tims924

    Does a 1200A switchboard require a separate fire rated room?

    The NEC Requires dedicated equipment space (Clearance in front of, above, etc) but it doesnt not need to be its own room. If you have oil filled transformers or dry type transformers over 112.5 KVA, they do not need to be a dedicated room but the room must have a fire rating. By making it...
  3. tims924

    Disconnect Switch Frequency Ratings

    I am looking to replace some open copper bussing and home made knife switches at an industrial site with listed and labeled equipment. The first problem I am running into is the disconnect switches that I would use to replace the knife switches are going to be exposed to 500V high frequency...

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