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To:  lml@lancaironline.net
Date: Fri, 26 Apr 2013 16:09:55 -0400
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From: "Dennis Johnson" <pinetownd@volcano.net>
References: <list-6227234@logan.com>
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Subject: Re: [LML] Legacy, G900 and circuit breakers
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Hi Berni,

I used nothing but modern automotive fuses*, in fuse blocks similar to this 
one:

http://search.yahoo.com/search;_ylt=Amrjdz5CnRxaEo09SGXbouNG2vAI?p=fuse+block&fr=my-myy&toggle=1&cop=&ei=UTF-8

They come in various sizes, from Digikey and B&C.  Since my flight test 
phase, I haven't blown a single fuse in six years and 600 hours of flying.

My fuse blocks are inaccessible in flight because if the fuse blows, there 
is most likely a problem that I'd rather troubleshoot on the ground and 
because no single fuse can take out enough stuff to be more than an 
inconvenience.  I believe the idea of resetting circuit breakers came about 
because way back when airplane manufacturers unintentionally undersized some 
breakers, causing occasional nuisance trips.  I've designed my electrical 
system to avoid nuisance trips.

I have a couple large fuse blocks on the avionics shelf and one near the 
battery, behind the pilot's seat back.  They are cheap enough that pretty 
much everything has its own fuse.

I think fuses versus breakers is a Ford versus Chevy sort of thing.  Either 
one works fine.

Best,
Dennis

*I have two circuit breakers; one for the overvoltage disconnect for each 
alternator control circuit. Neither one has ever tripped.