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1. 08:31 PM - Re: Re: FUSIBLE LINKS & CURRENT LIMITERS (Robert L. Nuckolls, III)
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| Subject: | Re: FUSIBLE LINKS & CURRENT LIMITERS |
At 09:47 PM 4/23/2022, you wrote:
>"johnbright" <john_s_bright@yahoo.com>
>
>
>rv8iator wrote:
> > Is there a min/max length for fusible=C2
> links?=C2 With=C2 either fusible=C2 link wire or
> fabricated using the method described in "The Connection"?
> >
> > ...chris=C2
>
>
>Note 4 says 4 to 6"
>and http://www.aeroelectric.com/articles/fuselink/fuselink.html says 5 to
6".
There is no 'maximum' length . . . i.e. no limits
other than what you'd put on a wire of that same
gage. The minimum is not terribly critical but
we do want to exploit the tendency for a fusing
conductor to open up pretty close to the center.
The time it takes is somewhat related to length.
Current generated heat along the conductor's length
propagates outward and longitudinally with the
center being most remote from heat-sinking
qualities of the ends. You can take a clue from
the pre-assembled fusible links found in
car parts stores. I would judge the assembly
shown to be on the order of 9" long. I don't
think I've ever seen one on a car less than
6".
I think a longer link may open faster. Somewhere
around here I've got a test fixture I built up
to demonstrate and measure fusible link
performance . . . may dig that up and finish
the experiment.
I saw a builder's contactors installation
wherein he used fusible link wire to make
a connection between the power posts on two
contactors . . . no splice to extending
wire.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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