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 Post subject: Arc Flash Study (IEEE 1584 Sample Calculations)
PostPosted: Sat Dec 21, 2019 9:39 am 

Joined: Tue Dec 17, 2019 10:00 am
Posts: 12
Hello all,

I trust you are all well.Going through the sample calculations provided in this new standard.While I'm waiting for the new software to be purchased by our firm ,I'm currently using excel spreadsheets (which is more laborious of course) for now.

For those of you who went through the sample calculations provided within the IEEE 1584-2018, whether you used software or manual methods (excell etc), are your values coming out matching those provided in the standard ?

Most of my values are coming out quite correct , except they are a bit higher towards the end i.e the stage of recalculating the arc flash boundary and incident energy based on the reduced arcing current.I'm referring to the example of the 480V system , where my incident energy is around 65 J/mm instead of 53 J/mm as shown on the standard.

Have any of you gone through those sample examples on your own and obtained similar values as ones in the stanmdard? Just want to know whether I am wrong or not, although I have double checked numerous times.

Regards

Ashford


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 Post subject: Re: Arc Flash Study (IEEE 1584 Sample Calculations)
PostPosted: Sun Dec 22, 2019 8:59 am 
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Joined: Wed Jun 10, 2009 5:00 pm
Posts: 263
Location: Toronto
Ashdgee wrote:
Hello all,

I trust you are all well.Going through the sample calculations provided in this new standard.While I'm waiting for the new software to be purchased by our firm ,I'm currently using excel spreadsheets (which is more laborious of course) for now.

For those of you who went through the sample calculations provided within the IEEE 1584-2018, whether you used software or manual methods (excell etc), are your values coming out matching those provided in the standard ?

Most of my values are coming out quite correct , except they are a bit higher towards the end i.e the stage of recalculating the arc flash boundary and incident energy based on the reduced arcing current.I'm referring to the example of the 480V system , where my incident energy is around 65 J/mm instead of 53 J/mm as shown on the standard.

Have any of you gone through those sample examples on your own and obtained similar values as ones in the stanmdard? Just want to know whether I am wrong or not, although I have double checked numerous times.

Regards

Ashford


yes the values are coming out matching those provided in the standard.

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Michael Furtak, C.E.T.
http://arcadvisor.com


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 Post subject: Re: Arc Flash Study (IEEE 1584 Sample Calculations)
PostPosted: Tue Dec 24, 2019 6:09 am 

Joined: Sat Nov 02, 2019 8:42 am
Posts: 4
Hi,

Yes, I've obtained the same values as in the sample calc's.

A little tip; check the Iarc current that is used in the formulae. For voltages < 600 V there is something special going on for the arcing current. Took me a while to figure out.

Good luck figuring out the error :)

Thanks.


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 Post subject: Re: Arc Flash Study (IEEE 1584 Sample Calculations)
PostPosted: Tue Jan 07, 2020 1:02 am 

Joined: Tue May 22, 2012 12:08 am
Posts: 8
I've also obtained the same values as the examples given in the 1584-2018 standard.

It is worth noting that Equation 6 (for calculating intermediate incident energy at Voc = 600 V) on page 25 uses 2 different arcing current values (Iarc & Iarc_600), so it would be worth checking that you are doing the same - as this is easy to miss.


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