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3300 alternator fuse

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icubob(at)gmail.com
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Posted: Thu Oct 07, 2010 3:39 am Post subject: 3300 alternator fuse

i recently heard of a jab installation where the regulator shorted out , causing damage to the firewall!

   shouldn't the connection between the alternator and the regulator be fused ? which wire?

  i was told the Z schematic doesn't show any such fuses. 

         bob noffs

  [quote][b]

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nuckolls.bob(at)aeroelect
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Posted: Thu Oct 07, 2010 7:24 am Post subject: 3300 alternator fuse

At 06:35 AM 10/7/2010, you wrote:

 	  Quote: 	
		  i recently heard of a jab installation where the regulator shorted 

out , causing damage to the firewall!

   shouldn't the connection between the alternator and the regulator 

 be fused ? which wire?

  i was told the Z schematic doesn't show any such fuses.


	


    This is a mixed bag. Just because something overheats

    and even catches fire does not necessarily mean that

    a current overload was involved. I've worked a number of

    airborne failures that produced severe damage and/or

    fires that never tripped a breaker.



    Breakers and fuses are designed to clear the "hard fault" . . .

    a current flow that is several times greater than the

    protection rating. The fault clears in milliseconds to

    perhaps a few seconds. While the currents are high,

    the duration is short and total energy dumped is relatively

    small.



    "Soft faults" are long term, intermittent shorts or

    sustained arcing scenarios where current flow is not

    great enough to trip the protection. Nonetheless, LARGE

    quantities of electrical energy is converted to heat that

    can erode structural materials and ignite combustibles.



    It wouldn't hurt to fuse the alternator leads. A 30A

    in-line fuse in one lead would provide protection against

    hard rectifier/regulator faults but NOT necessarily

    prevent the incident you described.

   Bob . . .

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icubob(at)gmail.com
Guest

Posted: Fri Oct 08, 2010 11:49 am Post subject: 3300 alternator fuse

thank you bob for the reply to my question.

  bob noffs

  [quote][b]

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