Re: (ET) Fuse fireball--warning

["Bob Murcek" <rmurcek geisinger edu>]

Good point about the arc.  Arcs are spectacular and produce a lot of light 
and heat, but it doesn't take an awful lot of current to sustain them.

>>> Robert Adsett <subscriptions aeolusdevelopment com> 1/2/2006 11:49:56 
>>> AM >>>
At 11:13 AM 1/2/06 -0500, Christopher Zach wrote:
>>John mentioned time to blow rating for fuses.  That can be an issue if 
>>you are close to the rating but I think you probably ran into the 
>>voltage 
>>rating given the description above.
>
>Yes. That is why the forklift fuse (which is AIR rated to 5,000 amps and 
>is DC rated) didn't blow in time. It's probably a slow blow.

It's also possible that the arc on the fuse that did 'blow' introduced 
enough resistance that the main fuse blow time was extended over that for 
a 
dead short.  I've seen that effect with controllers where the controller 
shorts but leaves a few 10's of milli-ohms worth of resistance in the 
circuit to protect the fuse.  Emergency disconnects are wonderful devices 
:)

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,   be 
they legal, genetic, or physical.  If you don't believe me, try to chew a 
radio signal. "  -- Kelvin Throop, III
http://www.aeolusdevelopment.com/ 


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