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What size wire?

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rvg8tor

Joined: 06 Apr 2009
Posts: 50
Location: Olympia, WA

Posted: Tue Sep 22, 2009 6:40 pm Post subject: What size wire?

Bare with me I am learning!  My system will follow Z12, but it does not list a AWG for the connection form the battery relay to the main bus and from the main bus to the E-buss.  Some of the drawings show a 6 AWG from the battery relay to the main bus, but the wire diagram from Van's calls out a 8 AWG.  So this got me to thinking how do I determine the size wire that will go here.  I understand wires sizing to individual components but how does one figure a wire feeding a bus?  Do I take the numbers from my load analysis (only continuous loads) and use that to size the wire?  Does the same theory apply for the wire connecting the main bus to the E-bus through the diode?



Lastly due to panel space my main buss is going to be in two rows, how do I make the interconnection between the two, bolt a strip of bus bar material between the buss that holds the CBs.  should I connect the two rows of breakers at both ends giving a redundant path to the second row.  To be clear my main bus is 2 rows of breakers and the E-bus is one row, for 3 rows total.  Thanks for the help.

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_________________
Mike "Nemo" Elliott
RV-8A QB (Engine)
www.mykitlog.com/rvg8tor

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Sep 23, 2009 11:48 am Post subject: What size wire?

At 09:41 PM 9/22/2009, you wrote:

 	  Quote: 	
		  



Bare with me I am learning!  My system will follow Z12, but it does 

not list a AWG for the connection form the battery relay to the main 

buss and from the main bus to the E-buss.  Some of the drawings show 

a 6 AWG from the battery relay to the main bus, but the wire diagram 

from Van's calls out a 8 AWG.  So this got me to thinking how do I 

determine the size wire that will go here.  I understand wires 

sizing to individual components but how does one figure a wire feeding a bus?


	


    As a general rule, fat wires that do not carry starter

    currents are picked to carry alternator currents. Many

    builders using 4AWG fat wires for battery installations

    near the engine simply use 4AWG for the altenrator b-lead

    and main bus too. But if your alternator is 60A or smaller,

    6AWG is fine for these two slots.



    Size the main-bus/e-bus jumper according to e-bus loads.

    Same philosophy for the e-bus alternate feed path from

    the battery bus.



 	  Quote: 	
		  Lastly due to panel space my main buss is going to be in two rows, 

how do I make the interconnection between the two, bolt a strip of 

buss bar material between the buss that holds the CBs.  should I 

connect the two rows of breakers at both ends giving a redundant 

path to the second row.  To be clear my main buss is 2 rows of 

breakers and the E-buss is one row, for 3 rows total.  Thanks for the help.


	


   Here's how Beech does it . . .



http://aeroelectric.com/Pictures/Breakers/Breaker_Panel_Busing_2.jpg



http://aeroelectric.com/Pictures/Breakers/Breaker_Panel_Busing_1.jpg



http://aeroelectric.com/Pictures/Breakers/Breaker_Panel_Busing_0.jpg



        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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