REFLECTOR: Wiring in ducts

[Terrence Miles]

Keith,

Sounds like we will be doing this about at the same time.  I am away from 
the project now doing family stuff.  I will return mid month to begin the 
install my electrical/panel.  I too have the GRT EIS 6000.  The first one 
came with too short a harness even tho we told them 20' or whatever it was.  
Also, Ronnie, believe it or not their wire is auto grade stuff, done with 
the reasoning that auto has many many more color combinations so labeling is 
dumb'ed down a littlle.

If memory serves all the engine monitor leads were wrapped in some cheapie 
looking nylon sheath that would cause me to pause too about proximity to hot 
oil lines.  So you raise a good point that I hadn't recognized yet.  I'll be 
back in SC in 2 weeks.   Keep us posted, and I'll do the same.

Terry


>From: "Ron Brown" <romott at adelphia.net>
>Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>Subject: Re: REFLECTOR: Wiring in ducts
>Date: Mon, 3 Jul 2006 07:43:57 -0400
>
>Wiring in ductsI ran my EIS wires, throttle and mixture down the Pilot side 
>along with the Oil Cooler Return line.  The EIS wire is in its own shrink 
>tubing.
>
>The copilot side has my 1/2" ID Copper Vacuum/Engine Ground return along 
>with the Hot Oil line.  It also has alternator, mag, Jeff rose, and other 
>non-instrumentation stuff on that side.  All of this wire is aircraft grade 
>- meaning High Temp ratings - hot oil lines won't hurt them.
>
>I ran my antennae coax on top (Outside) of the ducts.  All of my wiring for 
>the front of the firewall - strobes, nav lights, Westach capacitance fuel 
>probes, main gear limit switches, ELT, brake hydraulic Nylaflow are in the 
>keel - lots of space in there - use it!
>
>Ronnie Brown
>N713MR
>
>   ----- Original Message -----
>   From: Keith Hallsten
>   To: Velocity Aircraft Owners and Builders list
>   Sent: Sunday, July 02, 2006 10:49 PM
>   Subject: REFLECTOR: Wiring in ducts
>
>
>   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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