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Proper Wire Size for 60 Amp Alt? Aeroelectric Discrepancy?

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tx_jayhawk

Joined: 10 Jun 2006
Posts: 9

Posted: Sun Dec 16, 2007 12:14 pm Post subject: Proper Wire Size for 60 Amp Alt? Aeroelectric Discrepancy?

I'm assuming this is a misprint in the book, but the discrepancy is causing me to pause and question...



What is the proper B-lead wire size for a 60 amp alt (assuming everything is mounted FW forward and wire lengths are "std")?



My copy of AC 43.13 says 6 AWG should be protected by 80 amps on CB and 70 amps on fuse, and it seems 6 should be appropriate.



My Aeroelectric book rev 10A (and several current downloadable drawings) shows 6 AWG on some drawings with 60 amp (ref Z-12) and 4 AWG on others (ref Z-13).  In fact, Z-14 shows 4 AWG with a 40 amp alternator.



Given we know alternators are current limited (don't go above their rating...SD-20 aside), what would be the purpose to have 4 AWG in the above cases?  Or, am I correct to assume they are misprints?



Thanks,

Scott

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