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#68756 - 08/16/06 01:55 AM A video of an arc blast...  
mxslick  Offline
Joined: Oct 2004
Posts: 803
Atomic City, ID USA
Found THIS very interesting video of a 480 volt arc blast test.

Despite the somewhat unusual test conditions (a solid bolted fault directly on a transformer's terminals, the timed cutoff of the power {you'll hear a "ding" like a microwave saying dinners done}) it would be not too far off from the potential forces in most switchgear, I'd imagine.

Watch this and think about what would have happened if you were standing near that transformer.

The electric dragon spares no one when he decides to breathe fire.....

Please be safe!!!

Edited a few times to fix link...

[This message has been edited by mxslick (edited 08-16-2006).]

[This message has been edited by mxslick (edited 08-22-2006).]

[This message has been edited by mxslick (edited 08-22-2006).]

Stupid should be painful.

Work Gear for Electricians and the Trades

#68757 - 08/16/06 07:57 AM Re: A video of an arc blast...  
RODALCO  Offline
Joined: Dec 2005
Posts: 854
Titirangi, Akld, New Zealand
Thanks for that video clip.

It's amazing how much energy is available, especially at the transformer terminals.

Low resistance connections, maximum fault level available, high PSI and good quality switchgear.

Most good quality BSS HRC fuses are rated to break safely a fault at 80 or 120 kA.

You can see that good quality switchgear and HRC fuses are a must to clear low resistance faults near distribution transformers especially when cable runs are short and are of heavy gauge cable.

The product of rotation, excitation and flux produces electricty.

#68758 - 08/16/06 08:04 AM Re: A video of an arc blast...  
Tiger  Offline
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
Is your email correct RODALCO? I have a question for you, if you don't mind.


#68759 - 08/16/06 09:47 AM Re: A video of an arc blast...  
Roger  Offline
Joined: May 2002
Posts: 1,716
Thanks Tony. That gets the point across much better than words.


#68760 - 08/16/06 04:44 PM Re: A video of an arc blast...  
Larry Fine  Offline
Joined: Feb 2005
Posts: 693
Richmond, VA
I can't see it. All I get is:

Remote Host: [my IP address]

You do not have permission to access

Data files must be stored on the same site they are linked from.

Thank you for using FreeServers

Added: never mind, I got to the directory by lopping off the last part of the URL.

[This message has been edited by Larry Fine (edited 08-16-2006).]

Larry Fine
Fine Electric Co.

#68761 - 08/16/06 05:15 PM Re: A video of an arc blast...  
togol  Offline
Joined: Sep 2005
Posts: 421
Larry, I get the same message..... [Linked Image]


#68762 - 08/16/06 05:36 PM Re: A video of an arc blast...  
NJwirenut  Offline
Joined: Sep 2001
Posts: 806
Bergen County, NJ
Just go here:

and click on the appropriate link.

Somehow, a "%20" code got inserted into the posted link in place of a space.

#68763 - 08/16/06 06:27 PM Re: A video of an arc blast...  
SteveFehr  Offline
Joined: Mar 2005
Posts: 1,208
Chesapeake, VA
Heh, I'd posted that very video in the safety forum about 2 weeks ago!

More videos here:

#68764 - 08/16/06 09:38 PM Re: A video of an arc blast...  
mxslick  Offline
Joined: Oct 2004
Posts: 803
Atomic City, ID USA

No wonder!! I was at a loss as to where I first ran into that video, I honestly had thought it was on one of the other sites I browse...major brain flatulence here!!

That's what I get for posting when I'm tired!! [Linked Image]

So a big thanks to SteveFehr for bringing that link to my (stunted) attention!! [Linked Image]

Stupid should be painful.

#68765 - 08/21/06 10:55 PM Re: A video of an arc blast...  
Theelectrikid  Offline
Joined: Apr 2004
Posts: 810
Levittown, PA
That arc-blast video is shocking at the least! And I don't mean electric shock!

At the end of the first (transformer failure) video, you can just barely hear someone start saying "We need all available en-gines..."

Ian A.

[This message has been edited by Theelectrikid (edited 08-21-2006).]

Is there anyone on board who knows how to fly a plane?

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