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ANL/ANN current limiter

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wlively(at)gvtc.com
Guest

Posted: Sun Mar 09, 2008 12:38 pm Post subject: ANL/ANN current limiter

Hello

 

   I have a relatively long run (10+ ft) of 1/0 CCA main battery power wire in my -8 I am building from the rear baggage all the way to the front firewall. I would like to install an current limiter on the output of the battery as an added layer of protection for my long wire run. I know Mr. Nuckolls has not advocated that on small aircraft, but I want to do it anyway as peace of mind since the wire passes thru quite few bulkheads and want to have something which will trip alot faster than I can act. So, which is the better choice, ANN or ANL and what current rating would be best, I have a 200 hp angle valve to start?

 

 

Thank you,

Wade Lively

N100WL, reserved

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nuckolls.bob(at)cox.net
Guest

Posted: Mon Mar 10, 2008 7:44 am Post subject: ANL/ANN current limiter

At 01:35 PM 3/9/2008 -0700, you wrote:



 	  Quote: 	
		  



Hello



    I have a relatively long run (10+ ft) of 1/0 CCA main battery power 

 wire in my -8 I am building from the rear baggage all the way to the 

 front firewall. I would like to install an current limiter on the output 

 of the battery as an added layer of protection for my long wire run. I 

 know Mr. Nuckolls has not advocated that on small aircraft, but I want to 

 do it anyway as peace of mind since the wire passes thru quite few 

 bulkheads and want to have something which will trip alot faster than I 

 can act. So, which is the better choice, ANN or ANL and what current 

 rating would be best, I have a 200 hp angle valve to start?


	


    An ANL200 will carry 300A continuously. See:



    http://www.aeroelectric.com/Mfgr_Data/Fuses_and_Current_Limiters/Bussman/ANL_Specs.pdf



    This device can practically be expected to carry

    worst case cranking currents without nuisance tripping.



    At the same time, if you did fault that cable to

    the edge of a lightening hole, the same ANL will

    probably not trip while the wire burns its way

    clear at the edge of the hole.



    This is why these circuits have not been "protected"

    in TC aircraft. Protection robust enough to stay

    connected for worst case cranking will also carry

    more than enough current in a 'soft fault' condition

    to burn away the offending aluminum with little or

    no damage to the copper.



    Bob . . .

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