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Fuse Link At Battery

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bushpilot(at)optonline.ne
Guest

Posted: Sun Dec 17, 2006 11:17 am Post subject: Fuse Link At Battery

I am building a Glastar that will have and IO-320 with an  Aerosance FADEC. The electrical design is the Z-14 Dual Battery, Dual  Alternator, Split Bus. The batteries will be located behind bulk head "A" which  is at the back of the baggage area. From each battery there will be a 10 Awg  wire feeding the main and aux battery bus respectively. The 10 Awg wires will  run from batteries at the back up to the panel in the front.

  

 Where the 10 Awg wire connects to the battery, I would like to  provide some type of wire short protection. Currently, I am planning  on installing a 14 Awg fuse link. Any thoughts, suggestions or better  recommendations?

  

 Thanks,

 Johnathan

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bobf(at)feldtman.com
Guest

Posted: Sun Dec 17, 2006 3:43 pm Post subject: Fuse Link At Battery

On Sunday 17 December 2006 13:14, JOHNATHAN MACY wrote:



Iid suggest 4 AWG welding cables. I have a glastar and it needs minimal 

voltage drop. I have a LOM engine and even with that having good cranking 

voltage. 10 AWG is not big enouf I'd say



bobf



N125GS



 	  Quote: 	
		   I am building a Glastar that will have and IO-320 with an Aerosance FADEC.

 The electrical design is the Z-14 Dual Battery, Dual Alternator, Split Bus.

 The batteries will be located behind bulk head "A" which is at the back of

 the baggage area. From each battery there will be a 10 Awg wire feeding the

 main and aux battery bus respectively. The 10 Awg wires will run from

 batteries at the back up to the panel in the front.



 Where the 10 Awg wire connects to the battery, I would like to provide some

 type of wire short protection. Currently, I am planning on installing a 14

 Awg fuse link. Any thoughts, suggestions or better recommendations?



 Thanks,

 Johnathan

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nuckollsr(at)cox.net
Guest

Posted: Mon Dec 18, 2006 6:41 am Post subject: Fuse Link At Battery

At 02:14 PM 12/17/2006 -0500, you wrote:



 	  Quote: 	
		  I am building a Glastar that will have and IO-320 with an Aerosance FADEC. 

The electrical design is the Z-14 Dual Battery, Dual Alternator, Split 

Bus. The batteries will be located behind bulk head "A" which is at the 

back of the baggage area. From each battery there will be a 10 Awg wire 

feeding the main and aux battery bus respectively. The 10 Awg wires will 

run from batteries at the back up to the panel in the front.



Where the 10 Awg wire connects to the battery, I would like to provide 

some type of wire short protection. Currently, I am planning on installing 

a 14 Awg fuse link. Any thoughts, suggestions or better recommendations?


	


    This is generally not done in the TC aircraft world. BATTERY

    busses are located at the battery and the relatively short lead

    between contactor and bus does not call for protection.



    The general rule of thumb for always-hot wires in the airframe

    is that they be breakers of 5A or less . . . this would apply

    to your too-long bus feeder as well. Note the (*) on the wires

    between battery contactor and battery bus on all diagrams. This

    indicates that this wire's length should be minimized as much

    as practical.



        Bob . . .

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

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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

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nuckollsr(at)cox.net
Guest

Posted: Mon Dec 18, 2006 6:47 am Post subject: Fuse Link At Battery

At 05:53 PM 12/17/2006 -0600, you wrote:



 	  Quote: 	
		  



On Sunday 17 December 2006 13:14, JOHNATHAN MACY wrote:



Iid suggest 4 AWG welding cables. I have a glastar and it needs minimal

voltage drop. I have a LOM engine and even with that having good cranking

voltage. 10 AWG is not big enouf I'd say


	


   10AWG would be plenty big enough for a battery bus feeder.

   Battery busses drive only those devices that need to be operable

   when the battery master and alternator switches are OFF. This

   includes things like hobbs meter, clocks, courtesy lights, electrically

   dependent engine accessories, etc. It's doubtful that such loads would

   total more than 10A and 10AWG is fine.



   As cited in the earlier post, the battery bus feeder is always hot

   and it's length should be minimized. This places the battery bus

   AT the battery location and further suggests that all feeders from

   the bus be breakered at 5A or less (fused at 7A or less). If something

   really needs to be protected at higher levels (like a ECFI pump) then

   that accessory should be fitted with a "mini contactor" at the bus, not

   unlike the fat feeder to an e-bus illustrated in figure Z-32 of



http://aeroelectric.com/articles/Rev11/AppZ_R11J.pdf



   Bob . . .

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bushpilot(at)optonline.ne
Guest

Posted: Tue Dec 19, 2006 5:43 pm Post subject: Fuse Link At Battery

Bob . . .



 The authority rests with  experiment. 

                                   --Lawrence M. Krauss

  

 Thanks for the follow up and feedback. The  need to experiment at the wrong time has been averted.

  

 I appreciate it. Happy holidays to you and  yours.

 Johnathan

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nuckollsr(at)cox.net
Guest

Posted: Sat Dec 23, 2006 8:31 am Post subject: Fuse Link At Battery

At 08:42 PM 12/19/2006 -0500, you wrote:



 	  Quote: 	
		  Bob . . .

The authority rests with experiment.

                                   --Lawrence M. Krauss



Thanks for the follow up and feedback. The need to experiment at the wrong 

time has been averted.



I appreciate it. Happy holidays to you and yours.

Johnathan


	


    Thanks to yourself and others for the kind words. I'll

    endeavor to remain worthy of them.



    I've been off line for a few days. Seems the flu bug came

    to visit and I've been tethered to the commode on a very

    short leash for the first two days. Dr. Dee and I are going

    to go for a walk in the park this morning to try and stir up

    some muscles and circulatory systems that have been setting

    idle too long!



        Bob . . .

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

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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

- 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:

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