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Long and short hot feeders

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DCS317(at)aol.com
Guest

Posted: Fri Jul 09, 2010 7:14 am Post subject: Long and short hot feeders

Reviewing the Z-14 diagram, there is no fuse protection from the panel  switch turning on or off the main battery contactor.  In my airplane with a  battery in back, this means a 7 foot always hot lead.  Should I be  concerned?

  [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jul 09, 2010 12:28 pm Post subject: Long and short hot feeders

At 10:13 AM 7/9/2010, you wrote:

  	  Quote: 	
		   Reviewing the Z-14 diagram, there is no fuse protection from the panel switch turning on or off the main battery contactor.  In my airplane with a battery in back, this means a 7 foot always hot lead.  Should I be concerned? 	


    What's the failure mode? If that wire gets shorted

    to ground, what happens? If that wire gets shorted

    to the battery, what happens?  Are their any failure

    modes you can deduce that would cause a hazardous

    level of current to flow in that wire?



 

   Bob . . .    [quote][b]

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mrspudandcompany(at)veriz
Guest

Posted: Fri Jul 09, 2010 1:19 pm Post subject: Long and short hot feeders

[quote]    

   



At 10:13 AM 7/9/2010, you wrote:

    	  Quote: 	
		  Reviewing the Z-14 diagram, there is no fuse      protection from the panel switch turning on or off the main battery      contactor.  In my airplane with a battery in back, this means a 7 foot      always hot lead.  Should I be    concerned? 	


   What's the failure mode? If    that wire gets shorted

   to ground, what happens? If that wire    gets shorted

   to the battery, what happens?  Are their any    failure

   modes you can deduce that would cause a    hazardous

   level of current to flow in that    wire?



   

  Bob . . .  	  Quote: 	
		  

        This may be a low probability, but what if the coil in the contactor were to short?         Roger 	
[b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jul 09, 2010 4:15 pm Post subject: Long and short hot feeders

 	  Quote: 	
		    	  Quote: 	
		  



        This may be a low

probability, but what if the coil in the contactor were to short?

[/b] 	
	
 

             The wire in the contactor opens up. It's small gage

             wire total enclosed in a metal container.

         



 

   Bob . . .    [quote][b]

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Sat Jul 10, 2010 4:55 am Post subject: Re: Long and short hot feeders

DCS317,

 	  Quote: 	
		  this means a 7 foot always hot lead.  Should I be  concerned?

	


No.  Every time the master switch is turned on, it shorts this wire to ground.  If this wire is accidentally shorted to ground, the main contactor coil restricts the current flow.  The contactor will energize and you will lose the ability to shut it off.  The danger of fire or smoke is minimal.  If installed with secure terminations and care to prevent mechanical damage, then there should be no problem.

Joe

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Joe Gores

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