cold weather signal cables

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I have spent many hours looking through cables over the last few years and have drawn a blank for my requirements.

 

I am wondering if anyone can recommend a good cable, flexible in cold, with 4 low current conductors. (Incoming power 8-24V DC,  ground, RS232 RX, RS232 TX.) Current should peak at 100ma or less.

 

The dream cable would be very small diameter and very flexible at low temps.

 

Right now I have been using cat5e but it gets rigid in cold.

 

Thanks

Mike in Alaska

 

 

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Take a look at teflon insulated wire. That might be more flexible when cold.

 

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

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Alpha Wire -

cable selector is excellent

narrowed to 3 models by 24 AWG, Ethernet 5e, 4 pair, -50C to 80C, unshielded :

  • 76000
  • 76010
  • 76020

http://alphawire.com/en/Products/CableFinder

http://alphawire.com/en/Home/Products/Cable/Xtra-Guard-Performance-Cable/Xtra-Guard-Industrial-Ethernet/76010 :

  • 0.264in max diameter

https://www.mouser.com/ds/2/14/-851810.pdf (AlphaWire, 76010) :

  • -50C to 75C
  • Might be flexible enough at -40C
  • sunlight resistant

 

 

Belden's cable selector is not as easy 

Industrial Ethernet, https://catalog.belden.com/index.cfm?event=browse#c=Category_172686

https://catalog.belden.com/index.cfm?event=pd&p=PF_74002PU :

  • install at -15C to 60C

 

"Dare to be naïve." - Buckminster Fuller

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Go with a high strand count, that will be more flexible ...for example you can get 24 gauge made with standard 7 strand wire , or 24gauge made using 19 strands.  At least this starts you off with the most flexible copper core.  Of course temperature-wise, the insulation will make things stiffen up from that starting baseline at low temps.     

 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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In second thought, teflon insulated wire tends to be stiff at ANY temperature. 

 

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

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This stuff (silicone wire) is super flexible...don't know how  much it changes at low temps, but I'd bet it's reasonable.

 

https://www.daburn.com/2615-Ultra-Flexible-Silicone-Rubber-Wire-UL-3132.aspx

 

You can probably get the same thing in a multiconductor cable

 

I had some silicone caulk and it said:  for best results, apply between -30F & 300F  

 

Nice to know I can caulk my windows at 30 below zero, if I have nothing to do.

 

http://www.daburn.com/3621-DAFLEX-Ultra-Flexible-Silicone-Rubber-Cables-High-Temperature-200-C.aspx

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

Last Edited: Wed. Mar 7, 2018 - 12:46 AM
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Thanks for the excellent suggestions, I will check them all out.

 

This had been my dream cable so far:
https://www.digikey.com/product-...

 

But the price, not a dream, a nightmare.

 

Mike in Alaska

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I think you are right that silicone is the premier choice. Second would be some type of rubber is my guess.

 

I believe the cable I just posted as my "dream cable" is sold on that list of daburn cables also as the 5 pair.

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Here you go...some sources...keep marching

 

https://shenyuan.en.alibaba.com/productgrouplist-50219671/200_260C_Multi_core_Cable.html?spm=a2700.details.pronpeci14.3.4a26b4bfQgxtMc

 

 

adafruit has some short multiconductor silicone flats...maybe they'll sell a full reel, rather than just 39 inches for $10

https://www.adafruit.com/product/1437

 

 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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Perhaps a short range wireless serial solution would be better suited than a wired rs-232 cable?

 

Jim

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but he wanted power, too ...

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awneil wrote:
but he wanted power, too ...
     See Tesla! devil Nikola, not the car!

 

 

Jim

 

Click Link: Get Free Stock: Retire early! PM for strategy

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"Cat 5e" is not really a cable, but only a spec of some of the electrical properties of the cable.

It says nothing on the insulation resistance of the cable.

 

Combination of cold and flexibility is a tough goal for many plastics.

"Cost optimized" cables often have PVC insulation, which does not score high here.

 

So my advice is to invest some time in the properties of the different materials used for insulation first.

My first thoughts would be Sillicone, Rubber, or polyurethane.

A bit more solid thought, search the web:

 

https://duckduckgo.com/html?q=el...

http://www.awcwire.com/insulatio...

Doing magic with a USD 7 Logic Analyser: https://www.avrfreaks.net/comment/2421756#comment-2421756

Bunch of old projects with AVR's: http://www.hoevendesign.com