The Electrical Contractor Network

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

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Calling all Non-US members!! (Non-US only)
by aussie240
Yesterday at 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
New in the Gallery:
12.5A through 0.75mm flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
sparkyinak 7
Trumpy 6
Who's Online
0 registered (), 78 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#147693 - 01/03/03 05:22 PM single phase arc blast calculation
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
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.
Don
_________________________
Don(resqcapt19)

Top
Arc Flash PPE Clothing, LOTO & Insulated Tools
#147694 - 01/03/03 07:15 PM Re: single phase arc blast calculation
circuit man Offline
Member

Registered: 11/05/01
Posts: 287
Loc: saluda,s.c.
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.

Top
#147695 - 01/03/03 09:46 PM Re: single phase arc blast calculation
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
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.
_________________________
Don(resqcapt19)

Top
#147696 - 01/04/03 03:02 AM Re: single phase arc blast calculation
sparky Offline
Member

Registered: 10/18/00
Posts: 5545
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??

Top
#147697 - 01/04/03 05:25 PM Re: single phase arc blast calculation
ThinkGood Offline
Member

Registered: 08/07/02
Posts: 1084
Loc: Milwaukee, WI
There is some mention of the amount of force in this thread:
http://electrical-contractor.net/ubb/Forum14/HTML/000295.html

Maybe that will help?

Top
#147698 - 01/04/03 06:44 PM Re: single phase arc blast calculation
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
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.
Don
_________________________
Don(resqcapt19)

Top
#147699 - 01/04/03 08:54 PM Re: single phase arc blast calculation
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
It may also be found at www.arcwear.com. 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).]

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals