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Dave(at)AirCraftersLLC.co
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 Posted: Thu Dec 07, 2006 4:21 pm Post subject: Aluminum Bus question for Bob |
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Bob,
How can I calculate the current carrying capacity of aluminum for sizing of aluminum bus bars? Can I convert copper AWG to square inches then apply a factor for aluminum? Any idea what the factor would be? I want to jump 3-4 inches from a GPU plug to the main bus. #4 copper should be adequate but what size aluminum bar would be equivalent?
Dave Saylor
AirCrafters LLC
140 Aviation Way
Watsonville, CA
831-722-9141
www.AirCraftersLLC.com
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rtitsworth
Joined: 16 Jan 2006
Posts: 76
Location: Detroit, Mi
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| Posted: Fri Dec 08, 2006 5:11 am Post subject: Aluminum Bus question for Bob |
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Here is an excerpt of a reply I got from Bob on a related question several months ago. For more considerations, review the original message from the archive (or email me and I’ll send it).
Rick Titsworth
313-506-5604
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robh(at)hyperion-ef.us
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| Posted: Fri Dec 08, 2006 7:36 am Post subject: Aluminum Bus question for Bob |
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The electrical conductivity of aluminum alloy 6061-T6 is 43% IACS (International Annealed Copper Standard) and 2024-T351 is 30% IACS. The highest conductivity aluminum alloy (if we can call 99.6% pure aluminum an alloy) is 1060-O with 62 %IACS.
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So, if you are using conductor grade aluminum such as 1060 for your bus bar (not easy to find in your local Home Depot) use a cross section that is 1/0.62 = 1.6 times the cross section of copper bus bar. More likely you will use 6061 so the cross section must be 2.3 times that of copper for equivalent current carrying capacity. If you use aluminum wire assume that the stuff is made with conductor grade aluminum.
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AUTOTEXTLIST \s "E-mail Signature" <![endif]-->Best regards,
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Rob Housman
A070
Airframe complete
Irvine, CA
<![endif]--><![if !supportEmptyParas]> <![endif]>
-----Original Message-----
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com]On Behalf Of Dave Saylor
Sent: Thursday, December 07, 2006 4:19 PM
To: aeroelectric-list(at)matronics.com
Subject: AeroElectric-List: Aluminum Bus question for Bob
<![if !supportEmptyParas]> <![endif]>
Bob,
How can I calculate the current carrying capacity of aluminum for sizing of aluminum bus bars? Can I convert copper AWG to square inches then apply a factor for aluminum? Any idea what the factor would be? I want to jump 3-4 inches from a GPU plug to the main bus. #4 copper should be adequate but what size aluminum bar would be equivalent?
Dave Saylor
AirCrafters LLC
140 Aviation Way
Watsonville, CA
831-722-9141
www.AirCraftersLLC.com
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