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A while after I sent my post on grounding it
occurred to me that I'd said something potentially stupid. Well,
at least one thing. There may be others that I just haven't thought
of yet. Give me time.
I said to run a #10 or #8 wire from the
panel ground bus to the central grounding point; the point where the
#4 or #2 wire from the negative battery terminal goes through the
firewall. That part's ok. I then said that you could instead run the
#10/#8 wire from the panel ground bus all the way to the battery.
That's the stupid part. Sure, you could do it. But why would you
when you already have a much heavier wire from the central ground point to the
battery? The only time you would want to run a ground wire from the panel
bus bar directly to the battery is if that distance is shorter than from the
panel bus bar to the central grounding point.
And on further reflection a #10 wire from the panel
bus bar to central ground should be adequate unless you are bringing the ground
wires from high current devices (landing lights, pitot heat, strobes) back up to
the panel bus bar. In that case I would consider using #8.
Tom Gourley
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