REFLECTOR: Wiring in ducts

[Keith Hallsten]

I'm about to start pulling wire, and wanted to ask whether anyone has run
engine instrumentation wiring in the same duct as the big #2 alternator
feed/starter/engine ground wires.  I know that it's considered good practice
to separate the fat conductors from the little wires, in order to keep the
noisy big currents, alternator whine and associated magnetic fields away
from the signal wires.  

However, I'm not enthusiastic about running either type of wires through the
pilot's-side duct with the oil cooler lines.  I'm afraid that long term
exposure to the high temperatures will tend to cook the insulation.  I'm
going to be running a lot of thermocouple wires, pressure and temperature
signal wires, capacitive fuel gauge lines, and tach pulse lead up to the
Grand Rapids EIS 6000 engine monitor in the panel.  I don't know if the
potential electrical noise or the heat of the oil cooler lines will be the
bigger threat to their function and life.  So I'm undecided which is likely
to be the better scheme.  What say you?

Keith Hallsten
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