1. Create Your User Profile and Status Updates

    Arc Flash Forum members are invited to create a user profile. Let others know who you are, what you do and even add a picture or avatar of yourself. What are you up to? Let people in the arc flash and electrical safety community know with "status updates"!
  2. Welcome to the All New Arc Flash Forum

    Arc Flash Forum is a community where we help each other learn about arc flash and electrical safety. There is still much to be learned about arc flash, standards, PPE, studies and more and We need your HELP!

    If you have good information about Arc Flash - Post It! If you have a question about Arc Flash - Post It! If you can provide answers to Arc Flash questions - Post it!

    Sign up as a today member! Feel free to link to this site www.arcflashforum.com. Tell your friends. We want to help everyone be safe in the workplace!
  3. Bigger and Better!

    As you have no doubt noticed, the forum has been through quite an upgraded and looks and feels very nice! There are loads of new features and ways in which this site can now be even more useful to the community in learning about Arc Flash and Electrical Safety.

    Create your detailed user profile
    Add a profile photo of yourself
    Like the forum on Facebook
    "Like" users' posts
    Publish your articles in the library
    ...and much, much more!

    Learn More About the New Features Here
Create Your User Profile and Status Updates Welcome Message Arc Flash Forum has been Upgraded!

Arc flash for <125 kVA transformers

Discussion in 'IEEE 1584 - IEEE Guide for Performing Arc-Flash Ha' started by Aestrick, Mar 3, 2009.

  1. Aestrick New Member

    In IEEE 1584, dated 2002, on page 6, fourth paragraph, last sentence – “Equipment below 240 V need not be considered unless it involves at least one 125 kVA or larger low impedance transformer in its immediate power supply.â€

    Also on page 25, third paragraph, last sentence within the model and testing discussion – “The arc-flash hazard need only be considered for large 208 V systems: systems fed by transformers smaller than 125 kVA should not be a concern.â€

    I am working on Arc flash study for a small electric cooperative. Majority of our transformers are below 125 kVA size. I was wondering if anybody is using this as an option for not considering the arc flash study results for transformer less than 125 kVA.

    Any input would be appreciated.

    Thanks
    Aestrick, Mar 3, 2009
    #1

  2. ekalbs4 New Member

    I'm also wondering the same thing. If you have a bank of three single phase overhead 100 kVA transformers at 208Y/120, is this to be excluded by IEEE 1584 because it is <240V and no single unit is >125 kVA, or is it to be included in analysis, even though <240V, because the bank is 300 kVA, which is greater than the 125 kVA threshold?
    ekalbs4, Jul 24, 2009
    #2

Share This Page