It is currently Thu May 28, 2020 8:02 am



Post new topic Reply to topic
Author Message
ekstra   ara
 Post subject: NFPA-70E LATEST VERSION VS SPECIFICATIONS
PostPosted: Thu Dec 28, 2017 4:54 pm 

Joined: Sat Sep 23, 2017 3:15 pm
Posts: 7
Hope you all are doing well. I am emailing because I have an issue on one of the studies I'm working on where the specifications from the contractor for the project state "The arc flash hazard analysis shall be performed according to the IEEE 1584 equations that are presented in NFPA70E-2009, Annex D. My issue is that all of my SKM versions do arc flash evaluations for 2015 and later and I was wondering if anyone has ever come upon this issue or if it even matters because I am using a later version of the code to do my arc flash evaluation.

Best Regards,
Engineer in Training


Top
 Profile Send private message  
Reply with quote  
 Post subject: Re: NFPA-70E LATEST VERSION VS SPECIFICATIONS
PostPosted: Thu Dec 28, 2017 6:02 pm 
Plasma Level
User avatar

Joined: Mon Sep 17, 2007 5:00 pm
Posts: 1479
Location: Scottsdale, Arizona
That is an odd specification in that IEEE 1584 is a stand alone standard that happens to be copied in Annex D of NFPA 70E so it should simply state "based on equations from IEEE 1584" period. When the new IEEE 1584 is issued, there will possibly be a short period of time when NFPA 70E Annex D and IEEE 1584 201X are out of synch and that spec could have lead to trouble.

An earlier edition of the IEEE 1584 equations in Annex D even had a typo with the units so using the exact equations from Annex D would have been a problem. However the good news is, I work with representatives of all the major arc flash software companies and know they are using the current IEEE 1584 std. They are all on the IEEE 1584 committee and are ahead of the curve when it comes to getting ready to implement the next edition.

If you have the ability, ask the owner of the spec to delete the part about the equations from Annex D and simply reference the actual source: IEEE 1584.

Welcome to the forum!


Top
 Profile Send private message  
Reply with quote  
 Post subject: Re: NFPA-70E LATEST VERSION VS SPECIFICATIONS
PostPosted: Fri Dec 29, 2017 11:32 am 
Plasma Level
User avatar

Joined: Tue Oct 26, 2010 9:08 am
Posts: 2174
Location: North Carolina
The latest edition of IEEE 1584 is 2002 with a few minor corrections that were issued over a decade ago. 70E sort of had a variation on the calculation that was dropped after 70E-2004.


Top
 Profile Send private message  
Reply with quote  
 Post subject: Re: NFPA-70E LATEST VERSION VS SPECIFICATIONS
PostPosted: Wed Jan 03, 2018 4:37 pm 

Joined: Sat Sep 23, 2017 3:15 pm
Posts: 7
Thank you everyone for the responses. I figured I was kind of thinking about this one a little too hard and that my clients specifications were a little out of date. Thanks again for the reassurance!

Best Regards,
Engineer in Training


Top
 Profile Send private message  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 7 hours


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
© 2019 Arcflash Forum / Brainfiller, Inc. | P.O. Box 12024 | Scottsdale, AZ 85267 USA | 800-874-8883