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1. 02:49 PM - Wire bundles ()
2. 03:07 PM - Re: Wire bundles (Charlie England)
Message 1
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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
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| Subject: | Re: 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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