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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1491197@logan.com>
Subject: Re: [FlyRotary] Re: Fuse Ratings for Wiring??
Date: Sat, 21 Oct 2006 16:53:50 -0400
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Hi Larry, thanks for another perspective on the rating problem.  I certainly 
agree that we only want to allow the  amount of current to flow through the 
wires that the equipment load (with some margin) requires.  That is exactly 
why I say rate for the load and not the wire - this of course assumes your 
wiring design selected an appropriate size/rating wire for the equipment in 
the first place.  If my wiring selection will support my normal equipment 
load and I fuse/CB that line for the equipment load (which is less than the 
wire capability), I automatically protect the wire.

However, I've learned (well mostly) that convention,custom and natural laws 
are not violated without cost. Now I do like the quantum mechanics idea - 
just teleport to a distant location - Nahh, not as much fun - I mean how 
much discussion can we get into about quantum mechanics and rotary engines 
{:>).

Ed

 SNIP.....
 In summation we want to allow only the amount of
> current to flow thru those little wires as we need, and no more
> than that. That is what these two rules accomplish. They were
> written in the National electrical code and based on physics.
> And as we know the laws of physics will not be denied,
> except by quantum mechanics. But we are not building
> obam aircraft that require quantum mechanics,yet. HTH
> Larry Mac Donald
> lm4@juno.com
> Rochester N.Y.
> Do not achcive
>
> Max. current for 14 Ga. wire is 20 amps and
> On Fri, 20 Oct 2006 18:12:11 -0400 "Ed Anderson"
> <eanderson@carolina.rr.com> writes:
>> One thing  I have never really understood  regarding  fuses (or CB
>> for that
>> matter) is  - why you would use a fuse/CB with the rating set to
>> protect the
>> wire!!!   If you have a system operating off a power wire, it is
>> highly
>> likely that the wire will flow much more current than the system
>> requires by
>> quite a bit.  So if you select a fuse or CB rating that protects the
>
>
> --
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