Today's Message Index:
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0. 11:47 AM - Coming Soon - The List of Contributors - Please Make A Contribution Today! (Matt Dralle)
1. 06:38 AM - Fuse or CB for largish wires into cabin? (rockitdoc)
2. 07:32 AM - Re: Fuse or CB for largish wires into cabin? (user9253)
3. 08:35 AM - Re: Re: Fuse or CB for largish wires into cabin? (Bob Verwey)
4. 01:48 PM - Re: Final Elect. System Review (bcone1381)
5. 03:26 PM - Fusible Links in lieu of ANL protectors (rockitdoc)
6. 04:36 PM - Re: Fusible Links in lieu of ANL protectors (Charlie England)
7. 05:26 PM - Re: Fuse or CB for largish wires into cabin? (user9253)
8. 05:40 PM - Re: Fusible Links in lieu of ANL protectors (Eric Page)
9. 06:46 PM - Re: Fusible Links in lieu of ANL protectors (Robert L. Nuckolls, III)
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| Subject: | Coming Soon - The List of Contributors - Please Make |
A Contribution Today!
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Message 1
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| Subject: | Fuse or CB for largish wires into cabin? |
I am designing my power distribution for my RV-14A. Single battery, dual alternators,
two Dynon HDX1100's and two Pmags. I am using fuses for everything except
Pmags and alternators.
I am planning an always hot bus coming off the master contactor before the battery
for stuff that would be nice if the contactor fails. Should this wire (10AWG),
and for that matter, the wire from the other side of the contactor to the
main bus (6AWG), be protected by fuse or CBs since they enter the cabin?
Thanks, in advance.
Scott
--------
RV14A
Began 7-23-20
Fuse and tail Completed 2-20-21
Wiring in Process
Waiting on Wings, Finish, Engine
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508985#508985
Attachments:
http://forums.matronics.com//files/wiring_diagram_v25_592.pdf
Message 2
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| Subject: | Re: Fuse or CB for largish wires into cabin? |
The engine is more likely to quit than the battery contactor is to fail.
After a forced landing, that always hot #10 wire could make sparks which will ignite
leaking gasoline.
Having fuses in series is not a good idea. A shorted load could blow both the
load
fuse and the main fuse. Do not fuse the 6AWG main bus feeder.
If the battery contactor fails while flying, you might not even know it
because the alternator is supplying electrical power, not the battery.
If you are still concerned about the main contactor failing, see the attached circuit.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=508986#508986
Attachments:
http://forums.matronics.com//files/contactor_bypass_211.pdf
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| Subject: | Re: Fuse or CB for largish wires into cabin? |
Joe, slight thread drift..
My BD4 is wired with the battery in the back and a fat wire terminates at a
firewall stud.
The Master Contactor is activated by a switched earth wire 20AWG (with
in-line fuse as well) at the panel Master Switch.
The concern about unwanted electron flow refers...
In the event of a mishap which mashes wires, if the contactor earth wire is
shorted out to the airframe by bent metal, then the fat cable gets
energised...and being in close proximity to the earth wire, possibly would
suffer a breach, and start "welding", the very situation we are trying to
avoid.
Does one fuse the main cable? ...bearing in mind the horrendous amperage
demand of an IO470 starter.
On Tue, 22 Nov 2022 at 17:34, user9253 <fransew@gmail.com> wrote:
>
> The engine is more likely to quit than the battery contactor is to fail.
> After a forced landing, that always hot #10 wire could make sparks which
> will ignite leaking gasoline.
> Having fuses in series is not a good idea. A shorted load could blow both
> the load
> fuse and the main fuse. Do not fuse the 6AWG main bus feeder.
> If the battery contactor fails while flying, you might not even know it
> because the alternator is supplying electrical power, not the battery.
> If you are still concerned about the main contactor failing, see the
> attached circuit.
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=508986#508986
>
>
> Attachments:
>
> http://forums.matronics.com//files/contactor_bypass_211.pdf
>
>
--
Best Regards,
Bob Verwey
082 331 2727
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| Subject: | Re: Final Elect. System Review |
Bob;
Battery Condition will be checked every annual with a Lawn Mower destination when
80% capacity is reached. I believe that is an Industry Best Practice.
Fusible Link Question. You have a Cartoon titled "How to Fabricate Fusible Links."
In block one you say
THIS TECHNIQUE IS SUITED FOR 24 AND 22AWG FUSE LINKS ONLY (USE
TO PROTECT 20 AND 8AW G WIRES RESEPCTIVELY). CONTACT US FOR
SITUATIONS WHERE YOU MAY NEED LARGER FUSE LINKS.
What should I know about a 14 AWG fusible Link?
NOTE OF GRATITUDE:
I cant tell you how much I appreciated your reply. My concerns include fear that
I will build in a hidden failure point, or a single point of failure like N811HB.
A few days ago I stated reviewing past archive of my questions dating
back 5 years to fabricate a list of industry best practices. I'm humbled at
your patience and a lot of time with me on this forum. More than I deserve.
--------
Brooks Cone
Bearhawk Patrol Kit Build
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509072#509072
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| Subject: | Fusible Links in lieu of ANL protectors |
I am building an RV14A. I planned on using ANL current limiters for the two alternators
(60A PP and 40AB&C), but have since learned of these fusible link thingys.
I would prefer not to drill more holes in my firewall to mount the ANLs
an fusible links would foot the bill nicely. That is, if they provide the services
necessary to protect stuff.
If they do, where can one obtain, or how does one fabricate relatively largish
fusible links? B&C supplies a 20-24ga link kit which nI have, but what about
links much larger?
Thanks, in advance, as usual.
Scott
--------
RV14A
Began 7-23-20
Fuse and tail Completed 2-20-21
Wings 99%
Finish 90%
Engine 99%
Wiring in Process
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509074#509074
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| Subject: | Re: Fusible Links in lieu of ANL protectors |
On 11/22/2022 5:25 PM, rockitdoc wrote:
>
> I am building an RV14A. I planned on using ANL current limiters for the two
alternators (60A PP and 40AB&C), but have since learned of these fusible link
thingys. I would prefer not to drill more holes in my firewall to mount the ANLs
an fusible links would foot the bill nicely. That is, if they provide the
services necessary to protect stuff.
>
> If they do, where can one obtain, or how does one fabricate relatively largish
fusible links? B&C supplies a 20-24ga link kit which nI have, but what about
links much larger?
>
> Thanks, in advance, as usual.
>
> Scott
>
> --------
> RV14A
> Began 7-23-20
> Fuse and tail Completed 2-20-21
> Wings 99%
> Finish 90%
> Engine 99%
> Wiring in Process
>
Historically, they've been pretty common in automotive environments, so
they're easy to get.
8 gauge B lead?
https://www.google.com/search?q=12+gauge+fusible+link&rlz=1C1CHBF_enUS843US843&oq=12+gauge+fusible+link&aqs=chrome..69i57.5702j0j7&sourceid=chrome&ie=UTF-8
Big 6 gauge B lead?
https://www.google.com/search?q=10+gauge+fusible+link&rlz=1C1CHBF_enUS843US843&oq=10+gauge+fusible+link&aqs=chrome..69i57.4102j0j7&sourceid=chrome&ie=UTF-8
You can solder, or use bare copper crimps, & heat-shrink for insulation,
or (at least for the smaller lead) you can probably find a Fast-on crimp
that's big enough. The purpose-built link wire has its own flame-proof
insulation to contain the heat long enough for the link to open.
I like them because not only do they reduce the hardware to be mounted,
they also greatly reduce the number of terminations/connectors in the
circuit.
Charlie
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| Subject: | Re: Fuse or CB for largish wires into cabin? |
Don't put a fuse in series with the starter motor circuit.
A fuse has a certain amount of resistance which will reduce engine cranking speed.
As for the main power bus feeder, it is normally not fused, but some builder do
install a fuse.
If that fuse fails, the panel goes dark. Good workmanship will minimize the danger.
Adding extra components complicates the electrical system and increases the danger.
If the bus feeder shorts out, the pilot can shut off the battery contactor.
Your concern about the battery contactor coil energizing wire accidentally
shorting to ground is valid. But I don't know of a safer way to wire it.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509076#509076
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| Subject: | Re: Fusible Links in lieu of ANL protectors |
For wrapping your fusible links, search eBay for "silicone fiberglass sleeve".
It's similar to fire sleeve, but available in thin-wall versions and small diameters.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509077#509077
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| Subject: | Re: Fusible Links in lieu of ANL protectors |
At 05:25 PM 11/22/2022, you wrote:
><scott.shuler@colostate.edu>
>
>I am building an RV14A. I planned on using ANL current limiters for
>the two alternators (60A PP and 40AB&C), but have since learned of
>these fusible link thingys. I would prefer not to drill more holes
>in my firewall to mount the ANLs an fusible links would foot the
>bill nicely. That is, if they provide the services necessary to protect stuff.
Fusible links are the way to go. Just splice them onto the
risk-source end of your protected feeder.
For the big alternator, I suggest an 8AWG (or larger)
feeder with this fusible link.
https://tinyurl.com/2md9xov3
For the little alternator build a 10AWG feeder (or larger)
with this fusible link.
https://tinyurl.com/2mek723r
These are just a few options. You can buy
BULK fusible link wire but you wind up with
a extra wire you will probably
never need. Buying automotive pre-fab
links is a lot less fussy and nothing
to inventory.
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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