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Ground and ground loops

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Achille

Joined: 12 Jun 2017
Posts: 25
Location: Europe

Posted: Fri Jun 01, 2018 1:05 am Post subject: Ground and ground loops

Good morning, 



I send a message about ground loops and ground, I let my electrical system without finishing my work on it since months due to winter and other things.



Yesterday I decided to finish it because it's the only things that I have to do to fly. And months without working on it let me a bit confuse, even if I had diagram that is close to Z19 from Bob book, but for a wooden canard plane.



- My first question that I have it's about my ground on the alternator. 



On my drawing I wrote that I have a ground close to the battery on the forward side of the plane. (batery on the nose, and ground with B&C ground plate) and another ground spot on the engine side connected to the first via the 2awg ground for the starter.

 My alternator is screwed on the engine. If I set a 8 AWG wire from his ground terminal to the engine ground I will have a ground loop right ? (so I let it without ground wire ?)



My external car regulator is grounded to the main ground close to the battery.

Also on my plane I was thinking that my 2awg starter ground will pickup all my ground that I have on the aft part of the plane. I wanted to set a bras plate bolt on the ground alternator screw were my 2 AWG starter but It looked like not mecanicaly good, so I set this ground on engine bolt encoutered around. 



It's bad right ? (All my work during month reading the book to do a "good" electrical systeme are loosed on this " engine case bolt ground"  ?



Thank you in advance to help me.

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user9253

Joined: 28 Mar 2008
Posts: 1922
Location: Riley TWP Michigan

Posted: Fri Jun 01, 2018 4:46 am Post subject: Re: Ground and ground loops

 	  Quote: 	
		  If I set a 8 AWG wire from his ground terminal to the engine ground I will have a ground loop right ? 	


I would install that alternator ground wire.

The engine ground bolt should be fine.

Ground loops are more of a concern for avionics and audio.  Grounding them at a single point is good.

Consider using an EFIS instead of round gauges.

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Jun 01, 2018 6:25 am Post subject: Ground and ground loops

At 04:05 AM 6/1/2018, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "Achille" <mickael.t(at)live.fr>



 Good morning, 



 I send a message about ground loops and ground, I let my electrical system without finishing my work on it since months due to winter and other things.



 Yesterday I decided to finish it because it's the only things that I have to do to fly. And months without working on it let me a bit confuse, even if I had diagram that is close to Z19 from Bob book, but for a wooden canard plane.



 - My first question that I have it's about my ground on the alternator. 



 On my drawing I wrote that I have a ground close to the battery on the forward side of the plane. (batery on the nose, and ground with B&C ground plate) and another ground spot on the engine side connected to the first via the 2awg ground for the starter.

  My alternator is screwed on the engine. If I set a 8 AWG wire from his ground terminal to the engine ground I will have a ground loop right ? (so I let it without ground wire ?) 	


   Alternators automatically ground by virtue of

   their metallic mounts to the engine. No additional

   attention necessary.



 

  	  Quote: 	
		  Also on my plane I was thinking that my 2awg starter ground will pickup all my ground that I have on the aft part of the plane. I wanted to set a bras plate bolt on the ground alternator screw were my 2 AWG starter but It looked like not mecanicaly good, so I set this ground on engine bolt encoutered around. 



 It's bad right ? (All my work during month reading the book to do a "good" electrical systeme are loosed on this " engine case bolt ground" 	


   Is this a canard pusher? Check out this ground system

   architecture



 https://goo.gl/9PELRS 



   

   Think of your ground system as a 'star' centered on the

   B&C Ground Block bolt. You need a starter current rated

   jumper (2AWG certainly adequate) from a good crankcase

   attach point to the ground block bolt.



   You need a jumper from battery(-) to the ground block

   bolt.



   All other 'stuff' grounds at the block with wires

   of same AWG as the power feeder.



   Exception: All panel mounted electro-whizzies get

   their own 'star' system.



   Exceptions: Any avionics shields that show ground

   symbols should ground locally to their associated

   black box . . . do not extend shield grounds down

   to the B&C Ground Bus. 



 

 

   Bob . . .

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Achille

Joined: 12 Jun 2017
Posts: 25
Location: Europe

Posted: Fri Jun 01, 2018 7:37 am Post subject: Re: Ground and ground loops

Many thanks Joe and Bob for you reply.



I am reading again the book and it refresh my "knowledge" very well.



So I will let my alternator WHITOUT ground wire if I understand well;



My engine case couldn't substitute the firewall ground buse ? (I tell that because I already set ground on it.... Thing that I would like to avoid since.. yeasterday.

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