Bob;
My assumption is
that the circuits coming off the bus are all protected near the bus; so
putting protection on the feed wire near the bus doesn’t protect
anything. But I guess the discussion doesn’t mean much without a larger
context.
Al
G
-----Original
Message-----
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of
bobperk90658@bellsouth.net
Sent: Thursday, December 06, 2007 10:41
PM
To: Rotary motors in
aircraft
Subject: [FlyRotary]
Re: circuit breakers
Sorry that I didn’t make my thoughts
clear. My thinking is that the cable is just an extension of the
positive terminal of the battery.
If there is no possibility of the
wiring shorting out to ground, (This could be what if’this to death) you can
protect for the maximum amount of current your cable can
conduct. If there is any possibility that the cable
could be shorted to ground then, yes protect at the source. I would
think that a plastic plane with the positive cable in an isolated raceway
would present itself as a good candidate for the first scenario. A
switched disconnect could be inserted at the battery and remotely and manually
opened for a fill good safety feature . In any instillation you
have a certain amount of unprotected wiring between the battery and the buss,
this only extends that length.
In my mind the cable is just an extension
of the positive battery terminal, especially if the cable is sized large
enough to carry the entire load plus 100%. This may go contrary to
national wiring code but if you want control of the operation from the pilot
seat then this is what is needed.
Bob Perkinson
Bob Perkinson
-------------- Original message from
"Al Gietzen" <ALVentures@cox.net>: --------------
If
you want to protect the wiring from the battery to the buss place a fuse or
CB close to the buss.
Bob Perkinson
Bob;
Not
sure I understand that. The protection of the wire should be near the
source, not at the far end.
Al