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Grounding question

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Gilles.Thesee(at)ac-greno
Guest

Posted: Wed Jul 08, 2009 8:18 am Post subject: Grounding question

Hi Bob and all,



A buddy asked for help in adapting the wiring of his factory built Rotax 912 S aircraft.

He wishes something more similar to fig Z16



His battery, contactor, regulator and capacitor are under the seats, whereas the ground bus is on the firewall.

The factory originally grounded the regulator and battery contactor direct at the minus post of the battery.

Is it advisable to retain this configuration, or would it be better to ground those at the ground bus on the firewall, and retain only one fat ground wire running from the fwl to the minus pole of the battery.



Thanks in advance for your help,



Best regards,

Gilles

http://contrails.free.fr

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nuckolls.bob(at)aeroelect
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Posted: Fri Jul 10, 2009 11:51 am Post subject: Grounding question

At 11:17 AM 7/8/2009, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: Gilles.Thesee(at)ac-grenoble.fr



 Hi Bob and all,



 A buddy asked for help in adapting the wiring of his factory built Rotax 912 S aircraft.

 He wishes something more similar to fig Z16



 His battery, contactor, regulator and capacitor are under the seats, whereas the ground bus is on the firewall.

 The factory originally grounded the regulator and battery contactor direct at the minus post of the battery.

 Is it advisable to retain this configuration, or would it be better to ground those at the ground bus on the firewall, and retain only one fat ground wire running from the fwl to the minus pole of the battery.



 Thanks in advance for your help, 	


    You will note that none of the Z-figures attaches

    more than single, fat-wire to a battery terminal. I know 

    some manufacturers of electro-whizzies are fond

    of asking builders to "hook my product right to the

    battery terminals". 



    In the world of TC aircraft, we're sensitive to the

    effects of wrench-monkies who routinely replace certain

    articles over the lifetime of the airplane. Batteries

    certainly get replaced about as often as tires. It's

    not considered good practice to inject more variability

    than necessary into the reliable opening/closing of

    a fastener. Hence, batteries never get more than one

    wire on their terminals. In some cases, we even eliminated

    human-induced variability by designing batteries with

    connectors on them!



 [img]cid:7.1.0.9.0.20090710143816.01da7dd8(at)aeroelectric.com.0[/img] 

   The short answer is, I recommend you stay with the architecture

   described in Z-16.



 

        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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Gilles.Thesee(at)ac-greno
Guest

Posted: Sat Jul 18, 2009 1:52 pm Post subject: Grounding question

Robert L. Nuckolls, III a écrit :

 	  Quote: 	
		  

   The short answer is, I recommend you stay with the architecture

   described in Z-16.




	


Bob,



Thank you for your response.

Sorry for answering late, but I've been with no Internet connection for 

several weeks.



Thanks again,

Best regards,

-- 

Gilles

http://contrails.free.fr

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