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Small wires running with big wires

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MFleming

Joined: 31 Oct 2017
Posts: 17

Posted: Sun Nov 22, 2020 9:17 pm Post subject: Small wires running with big wires

I searched though the list but didn't find anything related to this. If it's here, my apologies.



My master and stater solenoids got installed along with an ANL fuse and shunt on the firewall today. 



My RV-7 plans show the main buss wire (6 AWG), master switch and starter switch wires going through the same firewall penetration.

In addition I have a clearance delivery buss wire (14 AWG) and the 2 shunt sensor wires I would like to have go through the same penetration. additionally  all these wires would be bundled together for about 2.5' before the big wires split off from the little wires.



I'm not worried about having the master and starter switch wires following this route but I'm unsure if the shunt wires would be adversely affected by the proximity to the big power wires.



Of course I could reroute the shunt wires but the most efficient route is as mentioned above.

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Michael Fleming

user9253

Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan

Posted: Mon Nov 23, 2020 4:34 am Post subject: Re: Small wires running with big wires

All of the wires that you mentioned can be run together without worry of interference.

The wires that are most vulnerable are audio wires, especially those whose signals get amplified.

Do not let the metallic parts of audio jacks touch metal airframe parts.

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Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Mon Nov 23, 2020 6:44 am Post subject: Small wires running with big wires

At 06:34 AM 11/23/2020, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>



 All of the wires that you mentioned can be run together without worry of interference.

 The wires that are most vulnerable are audio wires, especially those whose signals get amplified. 	


   and even then . . . the system designers will call out

   shielded wire where appropriate along with how those

   shields are to be terminated.



   There is no good reason to separate bundles of

   wires for the various systems as a hedge against

   noise.



   Back before they learned better, ADF installations

   in a single engine Cessna came with a kit for adding

   shields to alternator wiring . . . later the shields

   became 'standard'. I could never find anyone in the

   SE Electrical Group that could point to any empirical

   testing or analysis of the physics that justified

   this non-trivial expense. This wiring diagram

   is an excerpt from a C172 service manual.



   Short answer is: route wires as appropriate to

   construction goals. 



 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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