REFLECTOR: Wiring in ducts

[Keith Hallsten]

Thanks, Mike and Scott.  There's nothing like "reports from the field" to
provide confidence in striking out on a somewhat unconventional course.  I
was hoping that a few had gone down that particular path before me!

Keith Hallsten, XLFG



From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of MikeWatsonSpg at cs.com
Sent: Monday, July 03, 2006 10:28 AM
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Wiring in ducts

Keith,

I also have the GRT EIS-6000 and Horizon monitor. 

ALL wires to the rear go through the Copilot (right) duct, including the #2
ground and starter wire.  After nine years, no noise or interference of any
kind.  Errr, except for an occasional arc from the electric IVO prop.

Mike W.


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Monday, July 03, 2006 7:17 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Wiring in ducts

I've flown my Velocity for 450 hours with all the instrumentation wires in
the same duct as the big starter/alternator wire with no problems.

My experience with running wires in ducting for equipment has always been to
keep high voltage away from low voltage, and the AC away from the DC, but
that's more of a safety issue.

Scott


Keith Hallsten wrote:
>
> 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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