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Z14 wire size question

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Deems Davis

Joined: 09 Jan 2006
Posts: 925

Posted: Mon Aug 14, 2006 1:17 pm Post subject: Z14 wire size question

The Z14 (Dual Battery, Dual Bus) schematic in the Aero Electric 

connection depicts a Cross-Feed contactor who's purpose is to connect 

the 2 electrical systems together if required/desired. My question is:

Why is one side of the Cross-Feed contactor wired w/ 10 AWG (Aux Bus) 

and the other 4AWG (Main Bus)?????

In my plane the batteries (and contactors)are of necessity mounted in 

the rear, the respective distribution buses will be mounted forward 

(panel/firewall). If not absolutely necessary I would like to avoid the 

4AWG run from the crossfeed contactor in the rear to the main 

distribution buss (forward), and replace this with--- say 10AWG? (I have 

limited space for wire pulls).



THANKS for any help/advice



Deems Davis # 406

Fuse/finish/Panel

http://deemsrv10.com/

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nuckollsr(at)cox.net
Guest

Posted: Tue Aug 15, 2006 4:50 am Post subject: Z14 wire size question

At 02:15 PM 8/14/2006 -0700, you wrote:



 	  Quote: 	
		  



The Z14 (Dual Battery, Dual Bus) schematic in the Aero Electric connection 

depicts a Cross-Feed contactor who's purpose is to connect the 2 

electrical systems together if required/desired. My question is:

Why is one side of the Cross-Feed contactor wired w/ 10 AWG (Aux Bus) and 

the other 4AWG (Main Bus)?????

In my plane the batteries (and contactors)are of necessity mounted in the 

rear, the respective distribution buses will be mounted forward 

(panel/firewall). If not absolutely necessary I would like to avoid the 

4AWG run from the crossfeed contactor in the rear to the main distribution 

buss (forward), and replace this with--- say 10AWG? (I have limited space 

for wire pulls).


	




  Crossfeed contactor goes on the firewall and becomes a power

  distribution point for the two systems. Battery contactors and

  battery busses are back next to the batteries.



  Wires are sized according to the current they're asked to

  carry. Since the battery path is used during cranking, 4AWG

  wire is used between battery, battery contactor and crossfeed

  contactor. All other paths are commensurate with the size of

  the aux alternator . . . in this case the SD-20 so 10AWG

  is sufficient.



  Bob . . .

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