nuckolls.bob(at)aeroelect
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 Posted: Thu Feb 24, 2011 8:00 am Post subject: How should I use the AeroElectric Panel Grounding Hub? |
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I used Bob's Avionics ground bus and liked it. The only difficulty,
and it's no big deal, is the Comm grounds. Both of mine (A210 and
430W) require 18 awg wire. So I just ganged the 18 awg wire into 2
pins with 20 awg wire using solder sleeves.
22AWG pigtails of 6" are recommended but don't
change what you have. There's no way the radios
you mentioned are pushing the capabilities of an
18AWG wire.
A few years ago I described a technique I used
to parallel pins to achieve a high current
power path through a d-sub connector:
http://www.aeroelectric.com/Pictures/Connectors/D-Subminature/Paralleled_D-Sub_Pins.jpg
This was qualified for use on a system subject to,
shall we say, 'stressful' environmental conditions?
The idea was that short but SIGNIFICANT lengths
of 22AWG wire could be used as ballasting resistors
to insure a degree of current sharing between
paralleled pins. For the purposes of bailing the
worry-buckets of some skeptics, I de-rated each
pin down to 3A for qualification on this vehicle.
http://aeroelectric.com/Pictures/Misc/GQM_1st_Ops_Flight.jpg
As a practical matter, 4 to 5 amps per pin
stays well inside ratings for the device when
installed in benign environment YOU share
the same space in the airframe as the radios.
The environs enjoyed by the panel ground bus
is not especially stressful.
No big deal, easy to do. Nothing else on my panel comes close to the
limit for the pins except I do have an electric nose lift (10 amps
max) that is not grounded yet.
How did THAT load become a "panel" equipment load.
The intent of the panel ground bus is to provide a
localized, clean terminus for potential victims
(avionics and instrumentation). This design goal is
dishonored if one starts tying gear motors, landing
lights, pitot heat, etc. etc. to this bus.
I have been debating putting this on the bus with 3 20awg wires/pins.
Are you running out of pins in the bus? Recommend you
put all 5 wires in as suggested. Never can tell what you
might add to the bus in the future . . . long after you've
forgotten why it was a good idea to use only 3 wires.
Bob . . .
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