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Z-12 SD-20 wire size / fusible link size

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N601RT

Joined: 25 Feb 2006
Posts: 31
Location: Hillsboro, Oregon

Posted: Tue Feb 16, 2010 10:44 pm Post subject: Z-12 SD-20 wire size / fusible link size

Bob,



(Rev 12A) Z-12 suggests using a 10 gauge wire for the B-lead from the SD-20 with a 16 gauge fusible link. I believe you recommend sizing fusible links with wire that is 4 sizes smaller than the wire being protected. I'm guessing the B-lead wire size was changed during a cut-&-paste from 12 gauge to 10 gauge without re-sizing the fusible link? Do you recommend 10 gauge wire for an SD-20 B-lead and if so do you recommend 14 gauge wire for a fusible link if a fusible link is used to protect the B-lead?



Regards,



Roy

N601RT: 2003 CH601HDS, nose gear, Rotax 912ULS, All electric, IFR equipped, 1340hrs

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nuckolls.bob(at)aeroelect
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Posted: Wed Feb 17, 2010 10:06 am Post subject: Z-12 SD-20 wire size / fusible link size

At 12:44 AM 2/17/2010, you wrote:

 	  Quote: 	
		  



Bob,



(Rev 12A) Z-12 suggests using a 10 gauge wire for the B-lead from 

the SD-20 with a 16 gauge fusible link. I believe you recommend 

sizing fusible links with wire that is 4 sizes smaller than the wire 

being protected. I'm guessing the B-lead wire size was changed 

during a cut-&-paste from 12 gauge to 10 gauge without re-sizing the 

fusible link? Do you recommend 10 gauge wire for an SD-20 B-lead and 

if so do you recommend 14 gauge wire for a fusible link if a fusible 

link is used to protect the B-lead?


	


    16AWG would be fine . . . so would 14AWG . . . it just

    needs to serve the function of "electrically weak link"

    while not overheating beyond that which the insulation

    will stand . . .



    16AWG isn't even close to getting too hot at 20A. See:



http://aeroelectric.com/Pictures/Wire/22AWG_20A.pdf



    I'm working on tooling to build a base for the minature

    ANL style current limiters. We'll be offering these

    "robust fuses" on the website in the not too distant

    future. That "4AWG downsize" rule is a minimum step

    size, it COULD be 6 or even 8AWG smaller in some

    cases.



    For a 20A alternator, 12AWG b-lead with a 16AWG

    fusible link would be centered on contemporary

    design goals.



    Bob . . .

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