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#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: 5,308
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).]

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