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Unshielded Twisted Pair

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etienne.phillips(at)gmail
Guest

Posted: Mon Sep 29, 2008 4:02 am Post subject: Unshielded Twisted Pair

2008/9/28 Robert L. Nuckolls, III <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)>

 	  Quote: 	
		   --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)cox.net (nuckolls.bob(at)cox.net)>

    The short answer is that it is rarely necessary.

 

    Bob . . .

 

	




Hi Bob



The installation of the SD-8 alternator and regulator calls for twisting the cables down-stream of the smoothing capacitor... Surely this should be done for all power delivery cables if it's done for this particular set? Or is this done only for this set of wires because they're probably going to be running in close proximity to the alternator and it's spinning batteries?

 

Thanks

Etienne



  [quote][b]

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nuckolls.bob(at)cox.net
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Posted: Mon Sep 29, 2008 6:38 pm Post subject: Unshielded Twisted Pair

At 01:59 PM 9/29/2008 +0200, you wrote:

 	  Quote: 	
		  2008/9/28 Robert L. Nuckolls, III 

<<mailto:nuckolls.bob(at)cox.net>nuckolls.bob(at)cox.net>

>

><<mailto:nuckolls.bob(at)cox.net>nuckolls.bob(at)cox.net>

>   The short answer is that it is rarely necessary.

>

>   Bob . . .



Hi Bob



The installation of the SD-8 alternator and regulator calls for twisting 

the cables down-stream of the smoothing capacitor... Surely this should be 

done for all power delivery cables if it's done for this particular set? 

Or is this done only for this set of wires because they're probably going 

to be running in close proximity to the alternator and it's spinning batteries?


	


    No, this suggestion was driven by the fact that

    when the SD-8 came to the market about 20+ years

    ago, PLASTIC airplanes with the engine on the wrong

    end were king. COMPASS interference (due to strong

    magnetic fields around alternator feeds between the

    engine on the back and the battery on the front) was

    eliminated by twisting these wires.



    Again, this goes to my earlier suggestion that wires

    should be twisted based on manufacturer's installation

    instructions . . . and the fact that one system get

    twisted wires doesn't mean that all systems should get

    them.



    A figure Z-13/8 installation on an RV would not benefit

    from this process.



    Bob . . .

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echristley(at)nc.rr.com
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Posted: Tue Sep 30, 2008 4:41 am Post subject: Unshielded Twisted Pair

Robert L. Nuckolls, III wrote:

 	  Quote: 	
		  

    Again, this goes to my earlier suggestion that wires

    should be twisted based on manufacturer's installation

    instructions . . . and the fact that one system get

    twisted wires doesn't mean that all systems should get

    them.




	


Just to be clear, twisting wires isn't 'bad', per se.  It is just that 

it isn't necessary.  Correct?



If I have up to four wires following the same route (same origin and 

destination), I tend to twist them.  It's not for any electrical purpose 

.. just makes the installation neater and easier to handle.  I have a 

rack with four colors of wire in various gauges.  Twisting more that 

four wires doesn't create a tight bundle, so I switch to using looming 

after that.



The technique does have the drawback that if one wire goes bad or is 

damaged, I will have to replace two or more, but I figure there isn' t 

much that can damage one that won't damage all of them if they're 

following the same path anyway.

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nuckolls.bob(at)cox.net
Guest

Posted: Tue Sep 30, 2008 6:19 am Post subject: Unshielded Twisted Pair

At 08:40 AM 9/30/2008 -0400, you wrote:

 	  Quote: 	
		  

<echristley(at)nc.rr.com>



Robert L. Nuckolls, III wrote:

>

>    Again, this goes to my earlier suggestion that wires

>    should be twisted based on manufacturer's installation

>    instructions . . . and the fact that one system get

>    twisted wires doesn't mean that all systems should get

>    them.



Just to be clear, twisting wires isn't 'bad', per se.  It is just that it 

isn't necessary.  Correct?


	


   Correct. It has a downside of making wire bundles more bulky.

 	  Quote: 	
		  If I have up to four wires following the same route (same origin and 

destination), I tend to twist them.  It's not for any electrical purpose 

... just makes the installation neater and easier to handle.  I have a 

rack with four colors of wire in various gauges.  Twisting more that four 

wires doesn't create a tight bundle, so I switch to using looming after that.


	


    Nothing wrong with process-for-a-purpose. I've often

    used my drill motor to twist a pair or trio of 22AWG

    wires together for the purpose of bundling . . . just

    as you've suggested. We just need to be careful that

    our conversation is not mis-understood by bunches of

    other folks and they start twisting everything under

    a misguided notion that it automatically adds value.

 	  Quote: 	
		  The technique does have the drawback that if one wire goes bad or is 

damaged, I will have to replace two or more, but I figure there isn' t 

much that can damage one that won't damage all of them if they're 

following the same path anyway.


	


    This is an exceedingly low risk. It's been my experience

    that single wires don't take mechanical hits very often.

    Single wires are most at-risk from poor protection due

    to over-current. When wires take mechanical hits, it

    generally involves multiple wires.



    Bob . . .

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longg(at)pjm.com
Guest

Posted: Tue Sep 30, 2008 8:59 am Post subject: Unshielded Twisted Pair

Hey,

When I look behind my panel, all the wires are twisted 



Do Not Archive.



--

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