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Bob, My master switch controls power to
everything EXCEPT flight critical systems. I also had the
concern about a switch failing on any of the flight critical systems.
So here is what I did:
1. I purchased the best (sealed) toggle switches I
could buy for the power on - off (these are not the combined Switch/CB that I
use for things like lights, heater, etc - ie. non critical.) They were not
inexpensive - around $25-30 back in the early 1990s. I have five of these
for EC2, 2 Fuel Pumps and 2 injector disable switches.
2. I installed a 20 amp pull-type CB that by-passes
all switches for the critical systems. In other words should the power switch to
my EC2 or fuel pumps suffer a mechanical failure, I can push in this CB and it
routes power directly to the critical systems - you can then turn off the
toggle power switches and everything will continue to run. I call this my
"live man switch" {:>)
3. The injectors and ignition coils are wire
directly to the main buss through a CB (but no switches - well - actually the
injectors do have the disable switches)
4. I have two 40 amp CB between my battery and main
buss each on a separate power cable, the battery has two power cables each with
its own CB. This is what was left over once I went from two batteries to
one battery. So now I have two routes to power through 2 different
CBs. I know a bit anal, but makes me feel better {:>)
If I were to do it over, I would make the following
changes
1. Have a separate power lead and CB for each
ignition coil (I have the two stock coils)
2. Have a separate power lead and CB for each
injector pair(I have two pairs)
Hope this helps
Ed
----- Original Message -----
Sent: Tuesday, December 04, 2007 10:50
AM
Subject: [FlyRotary] circuit
breakers
Ed,
Do you run a master switch, or are the Circuit
breakers the switch. I have a master switch, but its bothering me that if that
ONE switch fails, it all fails. I I think I'll skip the master switch for
flight critical.
Bob Mears
Supermarine Spitfire
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