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 Post subject: Arc flash for <125 kVA transformers
PostPosted: Tue Mar 03, 2009 12:43 pm 
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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


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PostPosted: Fri Jul 24, 2009 8:48 am 
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Location: WA State
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?


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