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dave(at)abrahamson.net
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 Posted: Tue Sep 26, 2006 3:21 am Post subject: Powering breakers |
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I am having trouble finding pictures of the various ways to provide
power to breakers. I am using Bob's Z12 architecture and currently
running power to the alternator, backup alternator, and 3 other
breakers via a fuse block from B&C. This obviously means that these
circuits are protected by a fuse and breaker, and tests such as the
one for the voltage regulator burn the fuse out before the breaker
gets to pop. I would appreciate ideas, and pictures, on how to set
up a copper bar or other material to power these breakers. BTW,
testing a 2A breaker with a 10A ATO fuse in the circuit still burns
the fuse first.
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nuckollsr(at)cox.net
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| Posted: Tue Sep 26, 2006 4:49 am Post subject: Powering breakers |
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At 07:19 AM 9/26/2006 -0400, you wrote:
| Quote: |
I am having trouble finding pictures of the various ways to provide power
to breakers. I am using Bob's Z12 architecture and currently running
power to the alternator, backup alternator, and 3 other breakers via a
fuse block from B&C. This obviously means that these circuits are
protected by a fuse and breaker, and tests such as the one for the voltage
regulator burn the fuse out before the breaker gets to pop. I would
appreciate ideas, and pictures, on how to set up a copper bar or other
material to power these breakers. BTW, testing a 2A breaker with a 10A
ATO fuse in the circuit still burns the fuse first.
|
Fuses are MUCH faster than breakers . . . that's why
they're never shown used together in our published
drawings.
Recall that breakers are generally installed side-by-side
and fed from a "bus". The bus is hard-wired into the system
like all other busses with no need nor benefit from upstream
fuses.
This is an old but typical breaker installation on a bus
bar along with some notations on how NOT to configure the
installation.
http://www.aeroelectric.com/Pictures/Breakers/Bus_Bar_Not_3.jpg
Bob . . .
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fvalarm(at)rapidnet.net
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| Posted: Tue Sep 26, 2006 9:11 am Post subject: Powering breakers |
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Bob,
Is this common bar for connecting breakers rally the best way? I have seen
this before in TC aircraft but think of it as an example as what's wrong
with the methods/materials of TC aircraft. You would never see exposed
conductors like this in automotive, would you? What is the crash worthiness
of these exposed conductors? It seems too easy to bend and short to the
nearby structure or something else get pushed against it. The copper bar
should be insulated in my opinion. The question is which is the best way to
wire the breakers for reliability while keeping the conductors insulated?
Bevan
RV7A finish kit
--
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nuckollsr(at)cox.net
Guest
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| Posted: Tue Sep 26, 2006 5:15 pm Post subject: Powering breakers |
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At 10:09 AM 9/26/2006 -0700, you wrote:
| Quote: |
Bob,
Is this common bar for connecting breakers rally the best way? I have seen
this before in TC aircraft but think of it as an example as what's wrong
with the methods/materials of TC aircraft. You would never see exposed
conductors like this in automotive, would you? What is the crash worthiness
of these exposed conductors? It seems too easy to bend and short to the
nearby structure or something else get pushed against it.
|
Okay. Get out your hammer, crowbar, and hacksaw. Crawl
behind the breaker panel of any TC aircraft and pick a
piece of hardware you're going to choose to effect any
fault you want to hypothesize. What does it take to make
it happen . . . and what's the likelihood that this will
happen during operation of the aircraft.
| Quote: | The copper bar
should be insulated in my opinion. The question is which is the best way to
wire the breakers for reliability while keeping the conductors insulated?
|
Any way that meets your fancy. I don't know of many folks
who do it. The same concerns apply to straps used in
other places. Examples are seen in
http://www.aeroelectric.com/Pictures/Wiring_Technique/Contactor_Interconnect
. . . and only in #5 did the builder choose to put cocoons
around the exposed straps. I've never seen it done on
a panel of closely spaced breakers.
There are some things on airplanes (like spinning propellers)
that have been adjudged "reasonably safe" by virtue of controlling
things that might come into contact with it.
As to crashworthiness, the goal is to open battery contactors
so as to minimize the amount of hot wiring everywhere whether
or not it was insulated before the crash. If your airframe
is so badly folded as to put an exposed bus bar at risk, likelihood
of of that bus bar being the one thing that gets you killed is
exceedingly remote.
However, if you have concerns about the exposed conductors
and the $time$ to address them, there's nothing that prevents
you from devising whatever insulating techniques to assuage
those concerns. One of my favorites is the fuse-block. Everything
between fuse slots is already enclosed as supplied.
Bob . . .
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Jim Baker
Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA
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| Posted: Tue Sep 26, 2006 5:33 pm Post subject: Powering breakers |
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| Quote: | Okay. Get out your hammer, crowbar, and hacksaw. Crawl
behind the breaker panel of any TC aircraft and pick a
piece of hardware you're going to choose to effect any
fault you want to hypothesize. What does it take to make
it happen . . . and what's the likelihood that this will
happen during operation of the aircraft.
|
One would just have to lie upside down under the panel of my
Bellanca Viking to utter, "The horror! The Horror!!!!"
Downright ugly...but functional for 35 years now.......
Jim Baker
580.788.2779
Elmore City, OK
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