nuckolls.bob(at)aeroelect
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 Posted: Wed Feb 23, 2011 11:04 pm Post subject: How should I use the AeroElectric Panel Grounding Hub? |
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At 10:41 PM 2/23/2011, you wrote:
I purchased the Panel Grounding Hub because it sounded like a great
device and because it comes from Bob. But since getting the hub, I
have read about concerns about grounding avionics through the hub
because of current limitations of the individual pins and the
potential of exceeding the current capability of the hub and the 4 or
5 20 ga ground wires run to the Forrest of Tabs.
So how much current do you anticipate your panel
grounds will need?
Something was also mentioned about all ground wires not being
equal such as when a 16 or 18ga wire is split into two 20ga wires
for insertion into the hub.
Don't split stranding of wires. What items
on the panel require 16 or 18 AWG ground
wires and how much current is flowing
in these wires?
I understand that low power grounds such as from LED Panel lights are
a good choice for the hub. But I am installing a g430W, a SL-40, a
GTX-327, a PS5000EX, Dual GRT HX Displays, the GRT Autopilot when it
is released, a AFS Sport AoA, GRT EIS and a TruTrac Turn and Bank
indicator. Some of these individually have fairly low current
requirements but as a collective, the current is considerable.
Define "considerable". The current drains of all
these devices is known . . . by somebody. The total
current that can be loaded to 5x20AWG bundle to
the forest of tabs is 25A . . . do you think you're
going to push this?
If necessary, you can use more leads to the firewall,
or solder 12AWG wires to the bottom of the panel
bus . . . but please do these kinds of things because
you KNOW it's necessary/useful, not because lots of
folks poured their own uncertainties into your worry
bucket.
Bob . . .
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