Today's Message Index:
----------------------
1. 08:26 AM - Re: Too many Circuit breakers.... (Robert L. Nuckolls, III)
2. 09:32 AM - Re: Too many Circuit breakers.... (user9253)
3. 12:55 PM - Re: Too many Circuit breakers.... (andymeyer)
4. 01:52 PM - Re: Re: Too many Circuit breakers.... (Charlie England)
5. 03:55 PM - Re: Too many Circuit breakers.... (user9253)
6. 04:11 PM - Re: Too many Circuit breakers.... (user9253)
7. 06:02 PM - Re: Re: Too many Circuit breakers.... (Charlie England)
8. 08:20 PM - Re: Too many Circuit breakers.... (andymeyer)
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| Subject: | Re: Too many Circuit breakers.... |
>
>By 'group', do you mean putting multiple items
>on one protection device? The only answer is the
>additional devices you don't mind losing if
>something on the same circuit trips the circuit protection.
Generally a no-no in the big iron bird factories
>My strong preference is a big ATC fuse bus(es)
>mounted somewhere=C2 out of the way, so I don't
>have to make that call,=C2 and more importantly,
>I'm never tempted to play with=C2 them in the air.
>A fuse legend and a little plastic fuse puller
>is all that's needed to disable an individual
>circuit, though I rarely find the need to do that during maintenance.
Hear hear! See http://aeroelectric.com/articles/fusvsbkr.html
http://aeroelectric.com/articles/fuseorcb.html
99.99% of all breakers and fuses go to the bone yard when
the airplane is scrapped NEVER having been called upon
to save the wire it feeds. Yet much cost of ownership
and valuable panel space is dedicated to breaker-farms.
Do yourself a favor and tuck a fat fuse-block away
with protection on EVERY dedicated feeder . . . make
the block big enough to have some spares for future
expansion.
>The only thing on that list that I'd put on a
>breaker is the alternator field supply.
But even this is not necessary if you have something
other than crowbar ov management.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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| Subject: | Re: Too many Circuit breakers.... |
I will add my vote for fuses to those of Bob and Charlie.
A whole fuse block with fuses might cost less than one breaker.
Circuit breakers are mechanical devices that can fail either open or closed.
I tested a circuit breaker on the bench prior to installation. It smoked instead
of opening. I decided not to install a circuit breaker.
Fuses never fail to open when overloaded.
Fuses don't need to be installed on the instrument panel.
Fuses weigh less than breakers.
Each electrical load should have its own unique fuse. If it blows, only one load
is lost. And you will know which circuit has the fault.
Never reset a circuit breaker or replace a fuse while airborne. Do troubleshooting
when safely on the ground.
A wise man once said, "That tripped breaker or blown fuse just prevented smoke
and fire. Do you want to give the fire a second chance?"
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=506686#506686
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| Subject: | Re: Too many Circuit breakers.... |
Alright - looks like I might have some breakers to sell.
What's an ideal fuse block model for the ATC fuses. Any good brand or model suggested?
I'm scared of some of the stuff I see.
nuckolls.bob(at)aeroelect wrote:
>
>
>
> > The only thing on that list that I'd put on a breaker is the alternator field
supply.
>
> But even this is not necessary if you have something
> other than crowbar ov management.
>
Do I read this as: Since I've got the LR3D I don't need a breaker for the alternator
even though BandC calls for one? Just put a fuse where they call for breakers?
My ignitions - 2 Lightspeeds - What's the best protection for the wires running
from the panel to the back seat? I still need switches to turn them on or off,
might I be better off with a W31 Breaker switch and that be it, or is the complexity
of the W31 a risk? Part of me would like to be able to reset it if the
engine goes quiet and I'm out of other options. Though 2 dying at once seems
highly improbable.
Radio Master (Currently a W31 breaker switch) - people seem to be moving away from
avionics masters - is that really the best case these days? Let the Garmin
and Avidyne stuff suffer the brown-out during start and reboot? Or go around
twisting knobs off and on? I'd like to be able to get rid of as much load during
start. Normally, only things I have is LED Nav lights and the engine monitor.
(Engine monitor only needs ~4 volts to run)
Thanks Charlie, Bob and Joe!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=506688#506688
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| Subject: | Re: Too many Circuit breakers.... |
A lot of us are using Bussmann 15600-X-20 ATC Fuse Panels, like this:
https://www.amazon.com/Bussmann-15600-12-20-Fuse-Block-Assembly/dp/B001PYQP0E/ref=pd_lpo_2?pd_rd_i=B001PYQP0E&psc=1
The 'X' denotes the number of fuses in the block. From 4 (or maybe 2) up
to at least 18 fuses per block.
https://www.ebay.com/itm/284540458393?epid=1585402948&hash=item423feed599:g:T8AAAOSwLnBX2~T4
Bussmann also makes one with the wire exit on the bottom, but it
requires a dedicated crimper for the terminals. The 15600 has standard
1/4" blades for output terminals, so a regular PIDG crimper works for
the mating connectors.
I've not used any of them, but I'd expect any of the well known marine
vendors using ATC style fuses would be fine, too.
Charlie
On 5/7/2022 2:54 PM, andymeyer wrote:
>
> Alright - looks like I might have some breakers to sell.
> What's an ideal fuse block model for the ATC fuses. Any good brand or model suggested?
I'm scared of some of the stuff I see.
>
>
> nuckolls.bob(at)aeroelect wrote:
>>
>>
>>> The only thing on that list that I'd put on a breaker is the alternator field
supply.
>> But even this is not necessary if you have something
>> other than crowbar ov management.
>>
> Do I read this as: Since I've got the LR3D I don't need a breaker for the alternator
even though BandC calls for one? Just put a fuse where they call for breakers?
>
> My ignitions - 2 Lightspeeds - What's the best protection for the wires running
from the panel to the back seat? I still need switches to turn them on or off,
might I be better off with a W31 Breaker switch and that be it, or is the
complexity of the W31 a risk? Part of me would like to be able to reset it if
the engine goes quiet and I'm out of other options. Though 2 dying at once seems
highly improbable.
>
> Radio Master (Currently a W31 breaker switch) - people seem to be moving away
from avionics masters - is that really the best case these days? Let the Garmin
and Avidyne stuff suffer the brown-out during start and reboot? Or go around
twisting knobs off and on? I'd like to be able to get rid of as much load during
start. Normally, only things I have is LED Nav lights and the engine monitor.
(Engine monitor only needs ~4 volts to run)
>
> Thanks Charlie, Bob and Joe!
>
>
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| Subject: | Re: Too many Circuit breakers.... |
I don't like those Busman fuse blocks. They don't grip the fuses as tightly as
I would like. And the wires stick out to the sides which takes too much space.
Look for a fuse block that has the wires exiting from the back side.
Read this thread http://forums.matronics.com/viewtopic.php?t=16762261
Pay attention to what Stein posts. He owns a well respected avionics shop.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=506690#506690
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| Subject: | Re: Too many Circuit breakers.... |
I don't have any experience with these, but the wires exit the back side.
https://www.aircraftspruce.com/catalog/pnpages/11-13348.php
https://www.connectorconcepts.com/bu15reteatcf4.html
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=506691#506691
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| Subject: | Re: Too many Circuit breakers.... |
On 5/7/2022 5:54 PM, user9253 wrote:
>
> I don't like those Busman fuse blocks. They don't grip the fuses as tightly
as I would like. And the wires stick out to the sides which takes too much space.
Look for a fuse block that has the wires exiting from the back side.
> Read this thread http://forums.matronics.com/viewtopic.php?t=16762261
> Pay attention to what Stein posts. He owns a well respected avionics shop.
>
> --------
> Joe Gores
Hi Joe,
Your mileage obviously varies, from mine & a lot of others. ;-)
I've got 3 of them in my RV-7 project, and a couple in my flying RV-6.
Maybe I'm a wimp, but I can't pull a fuse without using the
purpose-built puller or a pair of pliers. A lot of guys are using them
in flying experimentals, mounted with the fuses facing down, for
hundreds of hours without losing any fuses.
Maybe you got a bad one, or one that someone else had abused?
Charlie
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| Subject: | Re: Too many Circuit breakers.... |
Alright - I'm down to 7 breakers, plus 4 W31's...
Any thoughts on the Avionics Master? - Yes? No? Either way?
Breakers:
Alternator
Ignition 1
Ignition 2
Engine Instruments (This is home built so I want to be able to reset if needed)
Transponder (in case I need to go quiet, formation, etc... It's remote only - breaker
is a fast switch)
Audio (In case I get a loud squeal or otherwise, I can get it out of the system)
Autopilot (In case it misbehaves)
W31's are switches/breakers for the following - (been in their for the same function
for ~20 years) All could be switches and if the W31's give up the ghost,
they will become switches / fuses:
Pitot Heat
Nav lights
Landing Light
Boost Pump
Thanks for helping me with the simplification - I'm liking this a lot better and
gaining a lot of comfort!
Andy
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=506693#506693
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