Matronics Email Lists :: View topic - Long and short hot feeders

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Long and short hot feeders

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

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]

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

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]

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

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]

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

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]

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

user9253

Joined: 28 Mar 2008
Posts: 1921
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

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

_________________
Joe Gores

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum