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Wire bundles

 
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graybeard



Joined: 20 Sep 2011
Posts: 33
Location: Grants Pass, OR

PostPosted: Thu Jul 16, 2015 1:49 pm    Post subject: Wire bundles Reply with quote

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


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ceengland7(at)gmail.com
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PostPosted: Thu Jul 16, 2015 2:07 pm    Post subject: Wire bundles Reply with quote

On 7/16/2015 4:46 PM, stazel(at)cpros.com (stazel(at)cpros.com) wrote:

Quote:
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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