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Teflon Wire - 7 strands vs. 19 stands

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dave.gribble(at)mchsi.com
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Posted: Sun Dec 12, 2010 10:39 am Post subject: Teflon Wire - 7 strands vs. 19 stands

I found some surplus M16878/4BGB1 wire.  I think it is 20 AWG wire with teflon insulation and coated copper conductors.  It is made of 7 strands of wire.  I know that newer wire is made of up 19 strands.  Will the 7 strand wire "work" with crimp connections such as AMP FastOn and crimped D-sub pins?



Thanks for any info,



dave gribble

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peter(at)sportingaero.com
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Posted: Sun Dec 12, 2010 1:07 pm Post subject: Teflon Wire - 7 strands vs. 19 stands

It will be very much less flexible than 19 strand wire, and so may break 

in service.



Peter



On 12/12/2010 18:35, dave.gribble(at)mchsi.com wrote:

 	  Quote: 	
		   



 I found some surplus M16878/4BGB1 wire.  I think it is 20 AWG wire with teflon insulation and coated copper conductors.  It is made of 7 strands of wire.  I know that newer wire is made of up 19 strands.  Will the 7 strand wire "work" with crimp connections such as AMP FastOn and crimped D-sub pins?



 Thanks for any info,



 dave gribble

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Dec 12, 2010 1:36 pm Post subject: Teflon Wire - 7 strands vs. 19 stands

At 12:35 PM 12/12/2010, you wrote:

 	  Quote: 	
		  



I found some surplus M16878/4BGB1 wire.  I think it is 20 AWG wire 

with teflon insulation and coated copper conductors.  It is made of 

7 strands of wire.  I know that newer wire is made of up 19 

strands.  Will the 7 strand wire "work" with crimp connections such 

as AMP FastOn and crimped D-sub pins?


	


    See attached file for description of M16878 wires.

    Yes, you have a Type E (600v thin teflon) wire that

    will be 20AWG silver coated 7 strand copper.



    Teflon was never real popular as an airframe wire.

    It's not very tough although the temperature ratings

    are great. 7-strand wire is not a really big deal.

    A quintrillion vehicles including airplanes have

    be wired with 7-strand wire . . . and we don't seem

    to be hearing about the lack of vibration resistant

    stranding.



    If you got this wire cheap and you're thinking about

    using a lot of it (it could probably substitute for

    22AWG in most applications, then it's probably a

    cost effective thing to do with no significant

    increase in risks.

   Bob . . .

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M16878_wire.pdf

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Bob McC

Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON

Posted: Sun Dec 12, 2010 1:49 pm Post subject: Teflon Wire - 7 strands vs. 19 stands

Dave;  

   

Yes, it will "work" with respect to being properly secured by the various terminals/connectors etc. However, 19 strand is considerably more flexible and consequently more vibration resistant than 7 strand. Both may perform satisfactorily in your application but if there is flexing involved (vibration?) the finer stranding will last longer and will impart lower loads on the devices to which it is attached. Gauge for gauge its fatigue resistance will be greater and mechanical forces transmitted less. This is the reason Bob recommends “welding cable” for fat wires due to its extremely fine stranding and hence greater flexibility. (Having said all that the fatigue resistance of the 7 strand may exceed the life of the airframe, but regardless the 19 strand will outlast it from an apples to apples fatigue standpoint)  

   

Bob McC  

   

   

   

> -----Original Message-----  

> From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-  

> server(at)matronics.com] On Behalf Of dave.gribble(at)mchsi.com  

> Sent: Sunday, December 12, 2010 1:36 PM  

> To: aeroelectric-list(at)matronics.com  

> Subject: Teflon Wire - 7 strands vs. 19 stands  

>   

> --> AeroElectric-List message posted by: dave.gribble(at)mchsi.com  

>   

> I found some surplus M16878/4BGB1 wire.  I think it is 20 AWG wire with teflon  

> insulation and coated copper conductors.  It is made of 7 strands of wire.  I know that  

> newer wire is made of up 19 strands.  Will the 7 strand wire "work" with crimp  

> connections such as AMP FastOn and crimped D-sub pins?  

>   

> Thanks for any info,  

>   

> dave gribble  

>   

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_________________
Bob McC
Falco #908
(just starting)

dave.gribble(at)mchsi.com
Guest

Posted: Sun Dec 12, 2010 2:04 pm Post subject: Teflon Wire - 7 strands vs. 19 stands

Thanks Bob - great reply.. but I'm confused about why the 20AWG Teflon wire "could substitute for 22AWG in most applications"

dave

---

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nuckolls.bob(at)aeroelect
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Posted: Sun Dec 12, 2010 3:44 pm Post subject: Teflon Wire - 7 strands vs. 19 stands

At 03:58 PM 12/12/2010, you wrote:

 	  Quote: 	
		  



Thanks Bob - great reply.. but I'm confused about why the 20AWG 

Teflon wire "could substitute for 22AWG in most applications"


	


   If you have a drawing that calls out 22AWG, then

   you either go out and buy some 22AWG or you consider

   substituting 20AWG assuming you don't mind taking the

   hit on weight (very small) and the wire will fit into

   all the crimped pins.



   In terms of footage, 22AWG wire is the most popular size

   in most airplanes. We did try 24AWG in the Premier . . .

   I think the techs on the line are used to it now but

   there was a lot of fuss at the beginning. It's more

   difficult to work with.



   I think I suggested to this List many years ago that

   builders buy full spools of 20AWG wire (1000'). It's

   cheaper in large quantities and can be used wherever

   the drawings call for 22 or 20AWG. This one size MIGHT

   account for 90% of all your wiring footage in a small

   airplane and ease your procurement task.

   Bob . . .

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