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Required Length of Fusible Links

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mikeeasley(at)aol.com
Guest

Posted: Tue Oct 13, 2009 5:21 am Post subject: Required Length of Fusible Links

B&C sells fusible links that are intended to be 5-6" long.  Do they have to be that long?  Do you need to allow any space around them for the heat when they smoke?  If you're protecting a #22 wire, do you go to #26 in the fusible link?

  

 Thanks,

  

 Mike Easley

 Colorado Springs

 

   [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Oct 13, 2009 9:01 am Post subject: Required Length of Fusible Links

At 08:12 AM 10/13/2009, you wrote:

  	  Quote: 	
		   B&C sells fusible links that are intended to be 5-6" long.  Do they have to be that long?  Do you need to allow any space around them for the heat when they smoke?  If you're protecting a #22 wire, do you go to #26 in the fusible link? 	


   Fusible links should not be used to generally replace

   fuses or circuit breakers. They are used only when

   a ROBUST feeder protection is needed. These might

   be properly called Micro-ANL current limiters.



   If you're considering an application other than

   one illustrated in the Z-figures, let's

   discus it here on the List.



   6" is a good length for meeting the thermal

   model that controls the fusing event. You

   COVER them in a material capable of containing

   the fusing event. Hence the fiberglas/silcone

   jacket in the B&C kit. #26 wire is too fragile

   to be practical for a/c wiring. #24 is marginal

   but okay in applications illustrated.



   I've often thought I should not have introduced

   the fusible link to the OBAM aircraft community

   but then, it's just a collection of simple-ideas

   with specific but LIMITED applicability to our

   design goals. Let's not start scattering these

   guys around the airplane. If you need an isolated,

   single strand not conveniently protected by

   a fuse at the bus, then consider an in-line

   fuse holder.



  http://aeroelectric.com/Pictures/Fuses/Fuse_Holders/ifh-2.jpg



 

        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------



     [quote][b]

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