Today's Message Index:
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1. 10:05 AM - Grounding Tabs (Michael Lazarowicz)
2. 10:30 AM - Re: Grounding Tabs (Ralph E. Capen)
Message 1
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I am currently wiring my RV8. I plan on using a "forest of Tabs" for
almost all of my grounding, Avionics, EFIS, Lights, Pumps flaps etc.
Because of the location of the forward baggage compartment on the RV8, it
is not really practical have the tabs on the firewall. I have a forward
battery and have a brass bolt connecting the Neg. lead and engine grounding
strap to the firewall. What I plan to do is run a #6 cable from there to
the "forest of tabs" mounted on the bulkhead behind the instrument panel.
I plan to insulate the brass plate and tabs form the bulkhead so all the
grounding will go directly to the brass bolt in the firewall. This way
there is a true single point grounding. It also makes for a nice clean
instillation. I have read the Aero Electric book several times and will
probably never fully understand ground loops. So here are my questions.
1. since my main power to the inside of the plane is a #6 cable I figure
the ground wire need not be bigger than a #6 between the firewall brass
bolt and the ground tabs. Does this make sense?
2. It may sound stupid , but is there any reason to to ground everything
like pitot heat, fuel pumps and flaps to that singe point with all the
avionics etc. ?
3. I have tried very hard to not mix any "fat wires" with skinny wires.
The only exceptions being the main battery cable , the mag wires, alt.
field B wire , battery relay and start wire all come thru the firewall
together . They pass thru a conduit in the baggage compartment so they can
get behind the panel. Is this OK?
4. Is there any reason that the main power cable #6 and many of the power
leads going to the circuit breaker panel cannot cross each other at a 90
deg. ?
All help is appreciated
Message 2
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| Subject: | Re: Grounding Tabs |
I ran as much as I could to the forest of tabs....if there's a grounding issue,
I know where to look for the broken wire.....
Also, I am hopefully preventing ground loops - and energizing the skin.....
YMMV
-----Original Message-----
From: Michael Lazarowicz
Sent: Jan 6, 2016 1:03 PM
Subject: AeroElectric-List: Grounding Tabs
I am currently wiring my RV8. I plan on using a "forest of Tabs" for almost all
of my grounding, Avionics, EFIS, Lights, Pumps flaps etc. Because of the location
of the forward baggage compartment on the RV8, it is not really practical
have the tabs on the firewall. I have a forward battery and have a brass
bolt connecting the Neg. lead and engine grounding strap to the firewall. What
I plan to do is run a #6 cable from there to the "forest of tabs" mounted on
the bulkhead behind the instrument panel. I plan to insulate the brass plate
and tabs form the bulkhead so all the grounding will go directly to the brass
bolt in the firewall. This way there is a true single point grounding. It also
makes for a nice clean instillation. I have read the Aero Electric book several
times and will probably never fully understand ground loops. So here are
my questions.
1. since my main power to the inside of the plane is a #6 cable I figure the ground
wire need not be bigger than a #6 between the firewall brass bolt and the
ground tabs. Does this make sense?
2. It may sound stupid , but is there any reason to to ground everything like
pitot heat, fuel pumps and flaps to that singe point with all the avionics etc.
?
3. I have tried very hard to not mix any "fat wires" with skinny wires. The only
exceptions being the main battery cable , the mag wires, alt. field B wire
, battery relay and start wire all come thru the firewall together . They pass
thru a conduit in the baggage compartment so they can get behind the panel.
Is this OK?
4. Is there any reason that the main power cable #6 and many of the power leads
going to the circuit breaker panel cannot cross each other at a 90 deg. ?
All help is appreciated
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