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Circuit protection

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tim2542(at)sbcglobal.net
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Posted: Fri Jul 09, 2010 8:10 am Post subject: Circuit protection

I have my electrical plan in the final draft and will post it here soon. But first I have a few questions. I will have breakers for a few items, the ignition, fuel pump, landing brake, nose lift, alternator field and pitch trim.  

      I am using a Plane Power      alternator with the integrated over-volt protection. I see no need for a      breaker in this case, why not use a fuse?  
The nose lift (EZ type A/C)      requires unswitched power to the lift and a 10A CB in the panel. This will      be a long run and needs protection back at the Bat Bus also. I plan to use      a fusible link for this. I also need unswitched power for the ignition (1      mag, 1 EI) and clock power. I thought I would pull the unswitched lead      forward with a fusible link at the bat bus, then branch out to the nose      lift, EI, and clock power. Something tells me there is a problem with      this. I can’t put my finger on it other than I can hear Bob saying a      bat bus is at the battery.  The EI probably needs a dedicated      circuit. But if the feeder was protected/sized to 15 amps, and knowing the      lift only draws heavy loads when the A/C is on the ground I thought it      should be ok. Thoughts?  
The rest of the breakers on the      panel will be fed from the E bus and some from the Main bus, both of which      are some 30”’ away. At what point (length) do I need to      protect those feeder circuits using fuses or fusible links?   

   

Thanks in advance, Tim Andres  

    

   

 (rnbraud(at)yahoo.com)   

   

       [quote][b]

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nuckolls.bob(at)aeroelect
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Posted: Fri Jul 09, 2010 4:15 pm Post subject: Circuit protection

At 11:10 AM 7/9/2010, you wrote:

  	  Quote: 	
		   I have my electrical plan in the final draft and will post it here soon. But first I have a few questions. I will have breakers for a few items, the ignition, fuel pump, landing brake, nose lift, alternator field and pitch trim.

     I am using a Plane Power alternator with the integrated over-volt protection. I see no need for a breaker in this case, why not use a fuse? 	
 

    Because it's a crowbar ov protection system that

    MIGHT nuisance trip for conditions as yet undiscovered. 	  Quote: 	
		    The nose lift (EZ type A/C) requires unswitched power to the lift and a 10A CB in the panel. This will be a long run and needs protection back at the Bat Bus also. I plan to use a fusible link for this. 	
 

    Please don't use fusible links for any other application

    than those illustrated in the Z-figures. Your gear motor

    circuit would be happier with a breaker. Where is the battery

    located in the airplane? 	  Quote: 	
		     I also need unswitched power for the ignition (1 mag, 1 EI) and clock power. I thought I would pull the unswitched lead forward with a fusible link at the bat bus, then branch out to the nose lift, EI, and clock power. Something tells me there is a problem with this. I can’t put my finger on it other than I can hear Bob saying a bat bus is at the battery.  The EI probably needs a dedicated circuit. But if the feeder was protected/sized to 15 amps, and knowing the lift only draws heavy loads when the A/C is on the ground I thought it should be ok. Thoughts? 	
 

    How about a fuse for each battery bus feed system

    in a fuse holder mounted right at the battery contactor?  	  Quote: 	
		    The rest of the breakers on the panel will be fed from the E bus and some from the Main bus, both of which are some 30”’ away. At what point (length) do I need to protect those feeder circuits using fuses or fusible links? 	
 

    Not sure what the 30" refers to. The E-bus and main

    busses are separated by 30"?



 

   Bob . . .    [quote][b]

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tim2542(at)sbcglobal.net
Guest

Posted: Fri Jul 09, 2010 6:02 pm Post subject: Circuit protection

(rnbraud(at)yahoo.com)   

        

  

From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Robert L. Nuckolls, III

 Sent: Friday, July 09, 2010 5:18 PM

 To: aeroelectric-list(at)matronics.com

 Subject: Re: AeroElectric-List: Circuit protection  

  

   

At 11:10 AM 7/9/2010, you wrote:

 

   

I have my electrical plan in the final draft and will post it here soon. But first I have a few questions. I will have breakers for a few items, the ignition, fuel pump, landing brake, nose lift, alternator field and pitch trim.

        I am using a Plane Power alternator with      the integrated over-volt protection. I see no need for a breaker in this      case, why not use a fuse?    



    Because it's a crowbar ov protection system that

    MIGHT nuisance trip for conditions as yet undiscovered. OK, that makes sense.    The nose lift (EZ type A/C) requires unswitched      power to the lift and a 10A CB in the panel. This will be a long run and      needs protection back at the Bat Bus also. I plan to use a fusible link      for this.   



    Please don't use fusible links for any other application

    than those illustrated in the Z-figures. Your gear motor

    circuit would be happier with a breaker. Where is the battery

    located in the airplane? On the main spar, perhaps 8’ away.     I also need unswitched power for the ignition      (1 mag, 1 EI) and clock power. I thought I would pull the unswitched lead      forward with a fusible link at the bat bus, then branch out to the nose      lift, EI, and clock power. Something tells me there is a problem with      this. I can’t put my finger on it other than I can hear Bob saying a      bat bus is at the battery.  The EI probably needs a dedicated      circuit. But if the feeder was protected/sized to 15 amps, and knowing the      lift only draws heavy loads when the A/C is on the ground I thought it      should be ok. Thoughts?   



    How about a fuse for each battery bus feed system

    in a fuse holder mounted right at the battery contactor? I can do that, I was trying to eliminate a couple of wires.    The rest of the breakers on the panel will be      fed from the E bus and some from the Main bus, both of which are some      30”’ away. At what point (length) do I need to protect those      feeder circuits using fuses or fusible links?   



    Not sure what the 30" refers to. The E-bus and main

    busses are separated by 30"?

 

 The CB’s on the panel are 30” away from the Main & Ebus, where they feed from. So I need to protect those feeds as they go to the CB’s right?    

Thanks, Tim  

   

  Bob . . .    	  Quote: 	
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 11:36:00

   [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jul 09, 2010 7:36 pm Post subject: Circuit protection

 	  Quote: 	
		   



 The CB’s on the panel are 30” away from the Main & Ebus, where they feed from. So I need to protect those feeds as they go to the CB’s right?  

 Thanks, Tim

 	


   The definition of a BUS is where the breakers and/or

   fuse holders all come together.  For example,



  http://aeroelectric.com/Pictures/Wiring_Technique/bus_bars_1.jpg

 

   All of those straps or "bars" between the breakers IS

   one kind of bus or another. In other words, where

   ever your breakers/fuses live is where the bus lives

   be it the E-bus, main bus, battery bus, etc. There

   are no "feeders" between a bus and the protection that

   taps that bus.



 

   Bob . . .    [quote][b]

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