REFLECTOR: Wiring in ducts

[Ron Brown]

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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