nuckolls.bob(at)aeroelect
Guest
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 Posted: Fri Jul 31, 2009 9:51 am Post subject: Z-20: Fuse Links, Master Switch, Alt OV Disc. and OVM |
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At 12:09 PM 7/31/2009, you wrote:
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> 18awg and 16awg Fuse Link to Starter Contactor
>
> On Z-20, connecting to the starter contactor is a 14awg wire from
the Alt OV disconnect relay that has an 18awg fuse link inline with
it. Although it meets the criterion of being 2 steps smaller than
the 14awg, it also say to contact Bob about making them any bigger
than with a 22awg line (protececting 18awg). Same issue occurs
above this in the diagram with a 16awg fuse link called out to
protect the 12awg master power line.
>
> Are these fuse links of a different type? On the diagram, it says
to refer to Note 4, which doesn't shed any light on this issue.
Also, B & C sells FLK-2 Fusible Link Kit, 20-16 AWG, but in their
instructions, they likewise say use this method for 20 and 18 awg, no larger?
http://www.bandc.biz/pdfs/Fuselink.pdf
Another Way to Skin a Cat
Instead of using a fusible link, it looks like an inline fuse with a
fuse holder could be used:
http://forums.matronics.com/viewtopic.php?t=34954 In this post, Bob
says to use MAXI fuses instead of ATC fuses to protect the
alternator. I'm guessing this was either because ATC didn't offer
them in a large enough size, or because the MAXI line was more
dependable for this application.
The ATC spec page
http://www.aeroelectric.com/Mfgr_Data/Fuses_and_Current_Limiters/Bussman/ATC_Specs.pdf
shows a 25A fuse (the size Bob said would work for a 20A alternator,
I believe) and a holder that would work up to 24A continuous.
The MAXI spec page
http://www.aeroelectric.com/Mfgr_Data/Fuses_and_Current_Limiters/Bussman/MAXI_Specs.pdf
shows only 20A and 30A without a 25A fuse.
So how should I protect my 20A Jabiru PM alternator? Fusible link,
25A ATC fuse and holder, or 30A MAXI fuse and holder?
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Any way you wish. All of the processes you mentioned
are suited for PROTECTING THE WIRE between the bus
and the alternator's rectifier/regulator.
The Z-20 data is but one recipe for success that
will perform as advertised. There are many
variations on a theme for protection of wires
which are interchangeable if exercised with
understanding about how the ingredient substitution
is expected to perform.
The plastic fuses would be fine 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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