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fvalarm(at)rapidnet.net
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 Posted: Sun Apr 10, 2011 9:34 am Post subject: avionics ground question |
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Basically I'm using a single point pass-through ground on the firewall. However, I also have a forest of tabs for an avionics ground (for convenience) located nearby which will be connected to the main ground with either 5 awg20 ala Bob's drawings or a single 12awg wire. The aircraft is an RV7 so the avionics ground will be bolted to a metal structure. This mounting method will naturally provide a secondary ground path back to the single point ground.
My question is should this avionics ground be insulated from the metal structure that it's bolted to, to eliminate a possible ground loop or at least to ensure that the electrons find their way back to the single point ground via the intended wire rather than some willy nilly path through the structure? or does it matter?
Bevan
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Sun Apr 10, 2011 10:32 am Post subject: avionics ground question |
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At 01:30 PM 4/10/2011, you wrote:
| Quote: | Basically I'm using a single point pass-through ground on the firewall. However, I also have a forest of tabs for an avionics ground (for convenience) located nearby which will be connected to the main ground with either 5 awg20 ala Bob's drawings or a single 12awg wire. The aircraft is an RV7 so the avionics ground will be bolted to a metal structure. This mounting method will naturally provide a secondary ground path back to the single point ground.
My question is should this avionics ground be insulated from the metal structure that it's bolted to, to eliminate a possible ground loop or at least to ensure that the electrons find their way back to the single point ground via the intended wire rather than some willy nilly path through the structure? or does it matter? |
This isn't so much a matter of 'wiring' as it is
a matter of locations. A panel ground bus is located
on the panel with the closest practical proximity to
the potential victims of ground induced noises.
Have all potential victims share a single ground
point with other non-antagonists on the panel
is a prophylactic against ground loops. When
all roads lead straight to Rome, there are no
shortcuts for unwelcome noise coupling events
to form up. It doesn't matter how THAT ground
point gets grounded, its a matter of WHO USES
that ground point.
The 37-pin panel ground bus we offer is insulated
from local ground . . . but it's not necessary
that it BE isolated.
Bob . . . [quote][b]
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