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Ground and ground loops

 
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Achille



Joined: 12 Jun 2017
Posts: 22
Location: Europe

PostPosted: Fri Jun 01, 2018 1:05 am    Post subject: Ground and ground loops Reply with quote

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: 1294
Location: Riley TWP Michigan

PostPosted: Fri Jun 01, 2018 4:46 am    Post subject: Re: Ground and ground loops Reply with quote

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
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PostPosted: Fri Jun 01, 2018 6:25 am    Post subject: Ground and ground loops Reply with quote

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: 22
Location: Europe

PostPosted: Fri Jun 01, 2018 7:37 am    Post subject: Re: Ground and ground loops Reply with quote

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. Rolling Eyes Rolling Eyes Rolling Eyes


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