ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
Anyone hiring inspectors?
by gfretwell. 03/27/17 01:36 AM
Old decora style outlets
by Admin. 03/25/17 11:40 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
fuse rejectors
by HotLine1. 03/24/17 07:53 AM
Another Forum Update
by Admin. 03/22/17 03:04 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,555 Are you busy
166,291 Re: Forum
160,676 Need opinion
Who's Online Now
0 registered members (), 44 guests, and 12 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#147693 - 01/03/03 09:22 PM single phase arc blast calculation  
resqcapt19  Offline
Joined: Nov 2000
Posts: 2,148
Is there a formula to calculate the arc blast for single phase circuits? All of the ones that I have found are for 3 phase? I'm sure that some large single phase installations would require special PPE in the event of a fault, but you need a calculation to determine the type of PPE required.


Arc Flash PPE Clothing, LOTO & Insulated Tools

#147694 - 01/03/03 11:15 PM Re: single phase arc blast calculation  
circuit man  Offline
Joined: Nov 2001
Posts: 273
done mean seem like a smart a** here , but looks like you would use all of the proper ppe wether you expect an arc bast are not.not that one may happen .just considering safety first.

#147695 - 01/04/03 01:46 AM Re: single phase arc blast calculation  
resqcapt19  Offline
Joined: Nov 2000
Posts: 2,148
The type of PPE required changes greatly based on the size of the arc blast that could be created at the equipment. With very high energy levels you may need this blast suit . With lower levels, you may only need a face shield, 100% cotton outerwear, and gloves. There are other levels of protection between these two. The calculation lets you choose the PPE that is required.


#147696 - 01/04/03 07:02 AM Re: single phase arc blast calculation  
sparky  Offline
Joined: Oct 2000
Posts: 5,303
it is a worthy point, if only to portray the ease of compliance, residentially speaking.

part 2 of my 02' 70E, page 68, has a sample calc, can i simply leave the 1.732 out??

#147697 - 01/04/03 09:25 PM Re: single phase arc blast calculation  
ThinkGood  Offline
Joined: Aug 2002
Posts: 1,081
Milwaukee, WI
There is some mention of the amount of force in this thread:

Maybe that will help?

#147698 - 01/04/03 10:44 PM Re: single phase arc blast calculation  
resqcapt19  Offline
Joined: Nov 2000
Posts: 2,148
Joe Tedesco provided me some information. Thanks Joe. Here is a link to a arc flash heat calculator . You have to register to download the arc flash calculator.


#147699 - 01/05/03 12:54 AM Re: single phase arc blast calculation  
Bjarney  Offline
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
It may also be found at It is “Duke Power's Heat Flux Calculator;” a crude non-graphical application, but illustrates the point.

The listed URL is maintained by Hugh Hoagland, who has been extensively involved in related standards authoring/consulting and PPE testing for awhile now. He may be able to confirm the factors for single-phase situations.

[This message has been edited by Bjarney (edited 01-05-2003).]

Member Spotlight
Posts: 362
Joined: April 2003
Show All Member Profiles 

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.018s Queries: 14 (0.004s) Memory: 0.7829 MB (Peak: 0.9375 MB) Zlib enabled. Server Time: 2017-03-27 10:41:10 UTC