nuckolls.bob(at)cox.net
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 Posted: Sun Dec 16, 2007 3:33 pm Post subject: Proper Wire Size for 60 Amp Alt? Aeroelectric Discrepancy? |
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At 12:14 PM 12/16/2007 -0800, you wrote:
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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?
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The Z-figures are ARCHITECTURE drawings and not
intended to specify the size of anything. Having
said that, I would wire with 4AWG for all fat wires
'cause it's easily acquired at the welding supply
store in nice, soft and easily worked wire. But
if it rings your chimes to chase down a piece of
6AWG for that short run of wire, that's certainly
okay too.
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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