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Grounding

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daveleikam(at)wi.rr.com
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Posted: Mon Oct 20, 2008 5:59 am Post subject: Grounding

When should you ground components locally and when  should you ground to the battery directly?

 Flap motor?  Lights?  Pitot heat?   Defrost fans, and the like?

  

 Dave Leikam

RV-10 #40496

N89DA  (Reserved)

Muskego, WI



   [quote][b]

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nuckolls.bob(at)cox.net
Guest

Posted: Mon Oct 20, 2008 7:14 pm Post subject: Grounding

At 08:57 AM 10/20/2008 -0500, you wrote:

 	  Quote: 	
		  When should you ground components locally and when should you ground to 

the battery directly?

Flap motor?  Lights?  Pitot heat?  Defrost fans, and the like?


	


    Nothing grounds directly to the battery. The battery

    and all things local to the panel and engine should

    go to a single point ground on the firewall. See View -A-

    of figure 15 of:



http://aeroelectric.com/articles/Rev11/AppZ_R11M.pdf



    Stuff away from the panel like landing lights, strobe

    supplies, position lights and pitot heat can ground

    locally to structure.



    Also see photos of grounding accessories at:



http://aeroelectric.com/Pictures/Grounding/



    Bob . . .

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daveleikam(at)wi.rr.com
Guest

Posted: Tue Oct 21, 2008 4:14 am Post subject: Grounding

Thanks, I should have rephrased battery to mean single point ground.



Dave



do not archive



---

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AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Tue Oct 21, 2008 8:54 am Post subject: Grounding

The subject of single point ground is an interesting one.  I think the

world of Bob's contribution to aircraft electrical wiring yet, the

SFAR88 issue (for the airlines) is an attempt by the FAA to quash those

of us that believe the US Navy actually brought down TWA 800 not a bad

single point ground using WWII wiring schemes.



There are many points covered in SFAR88 but one is a direct effort to

avoid single point grounds for electrical devices in proximity to

hydrocarbons.  It makes for an interesting consideration.  Till then,

this is still the best place to gain knowledge on wiring kit built

aircraft and enjoying their flight characteristics.



Like Bob says, They are not equal, they are better than certificated

production units.



John 

Do not Archive



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longg(at)pjm.com
Guest

Posted: Tue Oct 21, 2008 10:09 am Post subject: Grounding

Myself as well as many other builders in my area have simply used the B

& C grounding block. It's a thing of beauty. 48 inside and 24 on the

firewall. If that doesn't cut it, better to chat with Boeing on that

SFAR88 thingy.



Kudos to B & C for coming up with a simple but elegant solution to

grounding.



Yes, unless it's a 59' Plymouth with one of those Morse code looking

regulators, don't run grounds to the battery.



--

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nuckolls.bob(at)cox.net
Guest

Posted: Tue Oct 21, 2008 2:04 pm Post subject: Grounding

At 02:05 PM 10/21/2008 -0400, you wrote:

 	  Quote: 	
		  



Myself as well as many other builders in my area have simply used the B

& C grounding block. It's a thing of beauty. 48 inside and 24 on the

firewall. If that doesn't cut it, better to chat with Boeing on that

SFAR88 thingy.



Kudos to B & C for coming up with a simple but elegant solution to

grounding.


	


   That's a product we developed here and sold for a time

   before turning it over to B&C. We're going to be offering

   a panel-ground concentrator block in the near future.

   It will look like this:



http://aeroelectric.com/Pictures/Grounding/AVG_RA.jpg



   We're looking at a more compact version of the forest-

   of-ground-tabs too, but that one is not a done deal

   yet.

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longg(at)pjm.com
Guest

Posted: Thu Oct 23, 2008 6:43 am Post subject: Grounding

Very nice,

I'll buy two.



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