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 Post subject: IEEE1584 ver 2018 limited to bolted fault levels 65kA
PostPosted: Tue Sep 20, 2022 2:26 am 

Joined: Fri Sep 26, 2014 1:06 am
Posts: 3
Hi all
I just realize a limitation in the Arc flash tool, it was not capable calculating arc flash levels. I investigated and found that IEEE 1584 2018 edition doesn't cover bolted fault levels above 65kA rms.
The previous edition went to 106kA rms.
Are where other methods than IEEE 1584 equations to fulfill NFPA 70E arc flash hazard evaluation, which allow higher fault level?
Are there any recommended workaround with IEEE 1584 based software to get reliable results above 65kA?


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 Post subject: Re: IEEE1584 ver 2018 limited to bolted fault levels 65kA
PostPosted: Tue Sep 20, 2022 3:38 am 
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1682
Location: Scottsdale, Arizona
KEGHA wrote:
Hi all
I just realize a limitation in the Arc flash tool, it was not capable calculating arc flash levels. I investigated and found that IEEE 1584 2018 edition doesn't cover bolted fault levels above 65kA rms.
The previous edition went to 106kA rms.
Are where other methods than IEEE 1584 equations to fulfill NFPA 70E arc flash hazard evaluation, which allow higher fault level?
Are there any recommended workaround with IEEE 1584 based software to get reliable results above 65kA?


The 2018 Edition of IEEE 1584 is valid up to 106kA up to 600v. The 65 kA value is for 601v to 15kv

Quoted from page 20 if 2018 IEEE 1584:

Bolted fault current (rms symmetrical)
— 208 V to 600 V: 500 A to 106 000 A
— 601 V to 15 000 V: 200 A to 65 000 A

Hope that helps with clarify the range.


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 Post subject: Re: IEEE1584 ver 2018 limited to bolted fault levels 65kA
PostPosted: Tue Sep 20, 2022 3:45 am 

Joined: Fri Sep 26, 2014 1:06 am
Posts: 3
Thanks.

Sorry, I was not clear enough in my question. In this case the voltage is 800V and by that within the limitation of 65kA.
Our Arc flash tool simply reported "out of range" which is correct.

I was searching for alternative methods to calculate the Arc flash level above 65kA at 800Vac


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 Post subject: Re: IEEE1584 ver 2018 limited to bolted fault levels 65kA
PostPosted: Wed Sep 21, 2022 7:24 am 
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Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1682
Location: Scottsdale, Arizona
KEGHA wrote:
Thanks.

Sorry, I was not clear enough in my question. In this case the voltage is 800V and by that within the limitation of 65kA.
Our Arc flash tool simply reported "out of range" which is correct.

I was searching for alternative methods to calculate the Arc flash level above 65kA at 800Vac


Got it! Unfortunately that voltage range is a bit of a "hole" Maybe someday the low voltage range may be extended to 1000 volts but for now, the LV model model was not validated beyond 600 volts.


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