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Grounding architecture
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kenryan



Joined: 20 Oct 2009
Posts: 310

PostPosted: Sat Jul 28, 2018 7:50 am    Post subject: Grounding architecture Reply with quote

Eric, is the copper clad aluminum cable as stiff as copper of the same gauge?

On Sat, Jul 28, 2018 at 6:55 AM Eric M. Jones <emjones(at)charter.net (emjones(at)charter.net)> wrote:

Quote:
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones(at)charter.net (emjones(at)charter.net)>

Years ago Bob N. put togther a little collection called the "Economics of Weight Reduction", in which he had a piece I had written. It is still on the Aeroelectric Connection, but I attach it here. Good reading.

I too, wonder about using the aluminum skin for a ground conductor...Not that it doesn't work in most cases (it does work), but as the structure ages, and in some special cases, it gives me pause. The rivets could grow weak any you wouldn't even know it.

My guess is that steel airframes are best not used as ground due to magnetization.

Also to be sure, Aluminum is a far better conductor than copper per weight. I also include my piece on the subject.

I sell a lot of Copper Clad Aluminum cable to people who are extremely careful with weight. Drones, NASCAR, EAA aircraft, NASA,Aerovironment, TOP FUEL DRAGSTERS!, Searey, many others. There has never been a problem history with CCA.

--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=481895#481895




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http://forums.matronics.com//files/copper_cables_607.pdf
http://forums.matronics.com//files/economics_of_weight_reduction_139.pdf



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Eric M. Jones



Joined: 10 Jan 2006
Posts: 559
Location: Massachusetts

PostPosted: Sun Jul 29, 2018 7:33 am    Post subject: Re: Grounding architecture Reply with quote

Quote:
Eric, is the copper clad aluminum cable as stiff as copper of the same gauge?


Well, it's complicated. I don't sell this as replacement for Mogami microphone cable. Big cable is stiff cable UNLESS like some welding cable it is made of individual fine wires.

Copper Clad Aluminum is not made finer that 23 AWG (0.0226"), so all cables made from it can only be so flexible. On top of that the insulation sacrifices some flexibility to achieve its other desirable qualities. Bare, the CCA is very flexible.

On the other hand, it IS more flexible than SOME copper cable of the same gauge, just not all cables.

Sample on request.


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Southbridge, MA 01550
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BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 730

PostPosted: Sun Jul 29, 2018 6:12 pm    Post subject: Grounding architecture Reply with quote

Eric:
If you had the chance to get a Gold Ingot why would you go for a Gold Plated Ingot? Especially if they are the same price?  And don't give the lame excuse of weight?  You eat more at a single meal than you would save in weight if the entire plane was wired with copper plated aluminum.  BTW, what is the jacket made of on this magic wire?
Barry


On Sun, Jul 29, 2018 at 11:33 AM, Eric M. Jones <emjones(at)charter.net (emjones(at)charter.net)> wrote:
Quote:
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones(at)charter.net (emjones(at)charter.net)>


> Eric, is the copper clad aluminum cable as stiff as copper of the same gauge?


Well, it's complicated. I don't sell this as replacement for Mogami microphone cable. Big cable is stiff cable UNLESS like some welding cable it is made of individual fine wires.

Copper Clad Aluminum is not made finer that 23 AWG (0.0226"), so all cables made from it can only be so flexible. On top of that the insulation sacrifices some flexibility to achieve its other desirable qualities. Bare, the CCA is very flexible.

On the other hand, it IS more flexible than SOME copper cable of the same gauge, just not all cables.

Sample on request.

--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=481917#481917






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Eric M. Jones



Joined: 10 Jan 2006
Posts: 559
Location: Massachusetts

PostPosted: Mon Jul 30, 2018 4:50 am    Post subject: Re: Grounding architecture Reply with quote

Barry,

You obviously took the opportunity to attack me and the idea instead of reading the literature.

CCA is not "Plated". It is 10% copper in cross-section. Copper is not the "Good Stuff" and aluminum the "Bad Stuff." Aluminum is a better conductor by weight than copper. Every part of the modern electrical grid is aluminum. Boeing, Airbus and lots of other companies (including Michael Waltrip Racing) use tons of the CCA. Using CCA saves 1/2 the weight of Copper.

If you save a few pounds that you don't have to carry around for 10,000 hours. That's a big deal.

If that seems stupid to you, go your own way.

I never recommend CCA if the battery is on the firewall, and generally don't recommend it if the wire size is small (although for critical applications...some still demand it.)

As for the insulation, I sell Tefzel when requested, but battery cables don't get hot and the proprietary formulation I usually sell is more appropriate for this application.

And yes it IS MAGIC.


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www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
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