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 Post subject: Arc Flash PPE - 1EEE1584 - 2018
PostPosted: Tue Mar 05, 2019 3:03 am 

Joined: Tue Mar 05, 2019 2:57 am
Posts: 1
Dear Engineers
I am working with ETAP 19 version and
realize that there is no PPE Catogery mentioned in software.
Could you please assist me that category 1,2,3, and 4 are not applicable to the IEEE1584-2018 calculation ?
Regards
SA.


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 Post subject: Re: Arc Flash PPE - 1EEE1584 - 2018
PostPosted: Tue Mar 05, 2019 11:04 am 
Plasma Level
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Joined: Tue Oct 26, 2010 9:08 am
Posts: 2174
Location: North Carolina
sa_123456 wrote:
Dear Engineers
I am working with ETAP 19 version and
realize that there is no PPE Catogery mentioned in software.
Could you please assist me that category 1,2,3, and 4 are not applicable to the IEEE1584-2018 calculation ?
Regards
SA.


Forget levels.

ETAP is giving you the correct result.

70E is very clear on this. "Categories" (now called levels) apply when you are using the table-based method for arc flash PPE ONLY.

When you use IEEE 1584 (any version) you are using the engineered method, not tables. PPE Levels do not apply. You use Annex H. Annex H uses ATPV. You wear the arc flash PPE with an ATPV rating that is equal to or greater than the calculated incident energy. So you don't need and shouldn't be using levels when using ETAP. You should be using incident energy.

In practice it allows you to work on much more equipment for a given level. And according to an IEEE ESW paper in cases where the table approach was used, about 50% of the cases resulted in injury while using the IEEE 1584 method resulted in minor or no injuries at all.

This means you can take advantage of the actual ATPV on the PPE too.

And you don't have to change every time 70E changes the definitions. Such as relabelling all your panels when they got rid of "2*' levels.


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 Post subject: Re: Arc Flash PPE - 1EEE1584 - 2018
PostPosted: Mon Mar 11, 2019 4:28 pm 
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Joined: Tue Oct 26, 2010 5:00 pm
Posts: 191
Location: Maple Valley, WA.
I agree with what PaulEngr stated above except that the PPE Matrix used for the calculation method has been moved. For the NFPA-70E-2018 version it is now located in Table 130.5(G).

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Robert Fuhr, P.E.; P.Eng.
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