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Z-14 alternator wire guage??

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Bob Barrow

Joined: 11 Jan 2006
Posts: 29

Posted: Fri Oct 02, 2009 9:59 pm Post subject: Z-14 alternator wire guage??

I have the latest revision of Z14 (REV N 7/14/09) which shows that the Main Alternator (40 amp) has a 4 AWG B-lead. BUT the Aux Alternator (also 40 amp) has a 10 AWG B-lead. 

  

 Is there any possible logic in this discrepancy. 

  

 My calculations indicate that for a standard Lycoming set-up with main alternator at the front of the engine and the aux alternator on the rear of the engine 10 AWG should be more than enough for the B-leads for both C providing the battery is FWF.

  

 Am I missing something here.

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nuckolls.bob(at)aeroelect
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Posted: Sat Oct 03, 2009 5:28 am Post subject: Z-14 alternator wire guage??

At 12:50 AM 10/3/2009, you wrote:

 	  Quote: 	
		  I have the latest revision of Z14 (REV N 7/14/09) which shows that 

the Main Alternator (40 amp) has a 4 AWG B-lead. BUT the Aux 

Alternator (also 40 amp) has a 10 AWG B-lead.



Is there any possible logic in this discrepancy.


	


   No, there were some artifacts of cut-n-paste that

   didn't get combed out before the drawing was last

   published. They've been corrected. The latest drawing

   can be downloaded from the website.



 	  Quote: 	
		  

My calculations indicate that for a standard Lycoming set-up with 

main alternator at the front of the engine and the aux alternator on 

the rear of the engine 10 AWG should be more than enough for the 

B-leads for both, providing the battery is FWF.



Am I missing something here.


	


    I recommend 4AWG for all fat wires just because

    you need to buy enough of it to take care of battery/

    starter wiring. It's just handy to use the same

    gage for all fat wires. I'd leave the Main alternator

    at 4AWG and wire the Aux alternator for 20A as shown

    on the corrected drawing.

        Bob . . .



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

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

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