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                           RV8-List Digest Archive
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                     Total Messages Posted Thu 07/16/15: 2
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Today's Message Index:
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     1. 02:49 PM - Wire bundles  ()
     2. 03:07 PM - Re: Wire bundles  (Charlie England)
 
 
 
________________________________  Message 1  _____________________________________


Time: 02:49:24 PM PST US
From: <stazel@cpros.com>
Subject: RV8-List: Wire bundles

To avoid magnetic coupling, Bob Nuckolls recommends separating the 
=9Cfat=9D wires from the =9Cskinny=9D wires (The 
AeroElectric Connection, Chapter 16).  The fattest wire penetrating the 
firewall on my =938 (fwd. battery installation) will be the #8 
power wire from the master contactor to the VP-X via the right side 
firewall hole and under the F870B Stiffener.  So should I not use the 
same routing for the master switch, starter switch, and alternator field 
wires?

Stan Loer    
RV-8 QB


________________________________  Message 2  _____________________________________


Time: 03:07:48 PM PST US
From: Charlie England <ceengland7@gmail.com>
Subject: Re: RV8-List: Wire bundles

On 7/16/2015 4:46 PM, stazel@cpros.com wrote:
> To avoid magnetic coupling, Bob Nuckolls recommends separating the 
> fat wires from the skinny wires (The AeroElectric Connection, 
> Chapter 16).  The fattest wire penetrating the firewall on my 8 (fwd. 
> battery installation) will be the #8 power wire from the master 
> contactor to the VP-X via the right side firewall hole and under the 
> F870B Stiffener.  So should I not use the same routing for the master 
> switch, starter switch, and alternator field wires?
> Stan Loer
> RV-8 QB
>
I haven't powered anything up, yet, but I'm running everything through a 
single hole in my firewall (RV-7, if it matters). Coupling is greater 
the more area (distance) the wires run adjacent. Keeping the heavy power 
wire separated on both the hot & cold sides of the firewall *should* 
keep coupling along the 2-3" as it goes through the firewall minimal to 
non-existent. At least that's my hope in my installation.

If you're running anything unconventional, like electronic fuel 
injection or ignition, don't forget that stuff like the injectors or 
coil trigger lines can generate short duration but significantly high 
peak current pulses that can generate a lot more noise than the 'fat' 
wire. It's good to keep them somewhat separated from signal & sensor 
wires, as well.

FWIW,

Charlie

 

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