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Bonding Straps

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stearman456

Joined: 14 Aug 2010
Posts: 49

Posted: Mon Jun 02, 2014 9:26 am Post subject: Bonding Straps

In a mixed construction airplane (steel tube fuselage, wooden wings, aluminum structure flight controls, everything fabric covered) what would the down side be in not having everything electrically bonded?  My electrical system is a two wire, 14v system with everything running to a "forest of tabs" ground bus on the firewall.  The avionics (SL40 com, GTX 327 txdr) run to their own, dedicated ground bus which in turn is wired to the firewall ground bus.  I'm doing the bonding per the original design, but I'm just curious.  Would all the various assemblies of the airplane create static charges that would cripple the radios?



Dan

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nuckolls.bob(at)aeroelect
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Posted: Tue Jun 03, 2014 7:07 am Post subject: Bonding Straps

At 12:26 PM 6/2/2014, you wrote:

 	  Quote: 	
		  



In a mixed construction airplane (steel tube fuselage, wooden wings, 

aluminum structure flight controls, everything fabric covered) what 

would the down side be in not having everything electrically 

bonded?  My electrical system is a two wire, 14v system with 

everything running to a "forest of tabs" ground bus on the 

firewall.  The avionics (SL40 com, GTX 327 txdr) run to their own, 

dedicated ground bus which in turn is wired to the firewall ground 

bus.  I'm doing the bonding per the original design, but I'm just 

curious.  Would all the various assemblies of the airplane create 

static charges that would cripple the radios?



Dan


	




    Bonding for static control, grounding for power distribution

    and grounding for antenna performance are largely separate

    issues.



    P-static is not an issue for low speed aircraft cruising

    in the lower atmospheres. Sounds like you've got the

    lights lit up so the only thing left is to provide

    adequate ground planes under antennas. But in no case

    is there value in tying every 'grounded' device to

    all other grounded devices.

   Bob . . .

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stearman456

Joined: 14 Aug 2010
Posts: 49

Posted: Tue Jun 03, 2014 7:52 am Post subject: Re: Bonding Straps

Thanks Bob.  Would there be any value in tying the avionics ground bus directly to the battery instead of to the main ground bus?  (Putting the two ground buses in parallel instead of in series).

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nuckolls.bob(at)aeroelect
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Posted: Tue Jun 03, 2014 11:05 am Post subject: Bonding Straps

At 10:52 AM 6/3/2014, you wrote:

 	  Quote: 	
		  



Thanks Bob.  Would there be any value in tying the avionics ground 

bus directly to the battery instead of to the main ground 

bus?  (Putting the two ground buses in parallel instead of in series).


	


   No . . . and especially not the battery(-) post.

   The battery is but one of many components that

   benefit by sharing a centralized ground but its

   (-) terminal point should not be that

   centralize ground location.



   If you have a panel ground for potential vicitims

   that is in turn tied ot the central ground on the

   fire wall, you're good to go.



   Bob . . .

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stearman456

Joined: 14 Aug 2010
Posts: 49

Posted: Tue Jun 03, 2014 12:24 pm Post subject: Bonding Straps

Ok - thanks.  That was the way I understood it.

---

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