Today's Message Index:
----------------------
1. 09:27 AM - Re: Circuit protection for long battery wire (Stein Bruch)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Circuit protection for long battery wire |
Kelly is spot on.and to that point there will be a LOT (dozens to hundreds)
of wires in your airplane that aren't each individually protected with their
own fuse/breaker - both big and small. You design circuits such that you
can remove power (or a breaker/fuse is able to) and eliminate problems, but
it is impossible to physically protect each and every single wire with its
own protection device so you follow the best practices and design around the
99th percentile, not the 1th percentile (while keeping the 1th percentile in
mind).
Just my 2 cents as usual.
Cheers,
Stein
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of Kelly McMullen
Sent: Friday, September 26, 2014 10:05 PM
Subject: Re: RV10-List: Circuit protection for long battery wire
There is zero need to fuse that wire. No certified plane with the battery in
the rear has any circuit protection between the master relay at the battery
and the starter relay.
If that wire ever shorts, it will burn enough metal to eliminate the short,
faster than an ANL would open the circuit. Bob Nuckolls, host of the
AeroElectric forum and long time industry electrical guru does not recommend
an circuit protection on that wire beyond what the master relay provides.
The only line you might want ANL on is the power lead from the alternator.
Easy to find in the 60-100 amp range.
Kelly
On Fri, Sep 26, 2014 at 12:39 PM, bob88 <marty.crooks@comcast.net> wrote:
It seems there should be a current limiter to protect the long P27 wire from
battery to starter relay up front. What size fuse should be used? The
starter draws the most, up to 300 amps but I don't see fuses in this range.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=431149#431149
==========
target="_blank">http://www.matronics.com/Navigator?RV10-List
==========
">http://forums.matronics.com
==========
le, List Admin.
="_blank">http://www.matronics.com/contribution
==========
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|