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rj-320(at)hotmail.com Guest
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Posted: Thu Sep 27, 2007 3:38 am Post subject: wiring 101 |
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Greetings
A basic question, I am ready to install radios and some of the drawings show 2 aircraft 14v power pin outs going to a single circuit breaker using awg 22 and then to the bus. I am using fuse blocks and want to know if I should join the wires to a single tab on the fuse block and what is the proper techninique for doing so?
Thanks in advance Rick
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nuckolls.bob(at)cox.net Guest
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Posted: Thu Sep 27, 2007 4:43 am Post subject: wiring 101 |
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At 07:35 AM 9/27/2007 -0400, you wrote:
Quote: | Greetings
A basic question, I am ready to install radios and some of the drawings
show 2 aircraft 14v power pin outs going to a single circuit breaker using
awg 22 and then to the bus. I am using fuse blocks and want to know if I
should join the wires to a single tab on the fuse block and what is the
proper techninique for doing so?
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The most desirable practice is to have each power feed
to appliances have separate protection. It's not "unsafe"
to run more than one appliance from a single fuse . . .
but a failure in one circuit will take down all devices
that feed from that fuse.
If your referring to manufacturer's drawings for installing
their product and two wires go to a single breaker, then
it may well be that the designer WANTS both feeds to go
down if there's a fault in one of the feeds. Without specific
explanation in the installation instructions, it's a guess.
It's pretty unusual to see the arrangement you describe in
an installation manual so I'm thinking that perhaps it's
a considered, purposeful arrangement.
Having said that, the risks are low to follow the manufacturer's
instructions. Likelihood of ANY fault on either line opening
the circuit protection is low . . . and there are probably
hundreds of other failures within the devices that can take
them out of service and NOT open the protection.
So, unless you want to mount the academic exercise to
contact the manufacturer for clarification, I'll suggest
you wire it as shown in the manual and don't loose any
sleep over it. You DO plan to carry Dark Panel Syndrome
vaccination in your flight bag, no? See:
http://www.aeroelectric.com/Pictures/Misc/Vacination_for_Dark_Panel_Syndrom.pdf
Bob . . .
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( "Problems are the price of progress. )
( Don't bring me anything but trouble. )
( Good news weakens me." )
( -Charles F. Kettering- )
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