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12-20-2011, 12:11 PM
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Join Date: Feb 2009
Location: Brooksville
Posts: 282
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What good is the Alt Breaker
Ok so think about this with me..... 
The wire from the Alt to the breaker (commonly installed some place in the instrument panel) is not protected.
If I eliminate the breaker in my application (wire from the alt to the starter relay there will be less unprotected wire and as a benefit there will be NO unprotected wire inside the cockpit.
Has anyone used a fusible link at the alt?
Any other ideas?
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Weasel
RV-4 715hr Sold 
RV-10 "School Bus"
I have changed my User Name to the correct spelling as it became availible. Please direct all correspondence to Weasel
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12-20-2011, 12:16 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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Quote:
Originally Posted by Wesael
Ok so think about this with me.....
The wire from the Alt to the breaker (commonly installed some place in the instrument panel) is not protected. |
Not sure what you mean. The breaker IS protecting the wire its connected to.
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Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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12-20-2011, 12:24 PM
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Join Date: Jul 2010
Location: Orlando, FL
Posts: 1,077
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Quote:
Originally Posted by rocketbob
Not sure what you mean. The breaker IS protecting the wire its connected to.
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Hmmm, not if the wire shorts to ground between the alternator (source) and the breaker...
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Chris Smith
Maule M5-180C (Sold)
RV-6 O-360 CS (Sold)
RV-4 O-360 FP (Sold)
Full-time in the other type of RV....
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12-20-2011, 12:27 PM
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Join Date: Jul 2005
Location: North Atlanta
Posts: 1,120
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I assume you mean the B lead from the alt?
If so, I am a big fan of not having that heavy wire inside the cockpit. I run from the ALT to a current limiter next to the master or starter relay. Then run a solid copper bar between the current limiter and master/starter relay. http://www.bandc.biz/anlcurrentlimiterbase.aspx
There is no way in **** I'm going to reset a 60 AMP breaker in flight so why even have it? You still have the means to kill the ALT with a breaker to the field as well as a switch in most setups.
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Sid Lambert
RV-7 Sold
RV-4 - Flying - O-320 Fixed Pitch - Red over Yellow
Last edited by Sid Lambert : 12-20-2011 at 12:39 PM.
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12-20-2011, 12:47 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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Quote:
Originally Posted by ccsmith51
Hmmm, not if the wire shorts to ground between the alternator (source) and the breaker...
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Its the battery and electrical system that have to be protected, not necessarily the alternator.
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Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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12-20-2011, 01:19 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,642
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Quote:
Originally Posted by Wesael
...Has anyone used a fusible link at the alt...?
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Yes, I added a fusible link at both the main and standby alternators, just like a car.
In my "emergency kit", I have a spare link for each alternator, pre terminated with a ring terminal and a crimp splice. Field replacement should only take a minute once the cowl is off.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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12-20-2011, 01:35 PM
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Join Date: Mar 2007
Location: Woodinville, WA
Posts: 533
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Quote:
Originally Posted by Sid Lambert
I assume you mean the B lead from the alt?
If so, I am a big fan of not having that heavy wire inside the cockpit. I run from the ALT to a current limiter next to the master or starter relay. Then run a solid copper bar between the current limiter and master/starter relay. http://www.bandc.biz/anlcurrentlimiterbase.aspx
There is no way in **** I'm going to reset a 60 AMP breaker in flight so why even have it? You still have the means to kill the ALT with a breaker to the field as well as a switch in most setups. |
Ditto--ANL current limiter on the front side of the firewall. Look at the Aeroelectric Connection book if you haven't already.
-Rob
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Rob Kochman
RV-10, Flying as of March 2011 ( blog)
Paine Field (KPAE)
EAA Chapter 1440
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12-20-2011, 02:07 PM
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Join Date: Oct 2005
Location: Highland Village, TX
Posts: 1,519
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Field Breaker
Is it possible that the CB in question is the Alternator Field breaker? In my plane, this is a 5A breaker on the panel.
I too used the Aeroelectric Connection schematics as the starting point for my electrical system and this is what Bob N. recommended. I presume it's to protect against short in the field itself or if the field wire is shorted to ground ....that and the fact that all circuits off the main power bus should have protective device installed close to the bus.
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Rick Aronow,
A&P
Flying 7A Slider;
RV-12 SOLD
Highland Village,TX
Last edited by Rick_A : 12-20-2011 at 02:11 PM.
Reason: re-wording of reply
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12-20-2011, 02:24 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by RV10Rob
Ditto--ANL current limiter on the front side of the firewall...
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Same here.
(Click to enlarge)
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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12-20-2011, 07:17 PM
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Join Date: Feb 2009
Location: Brooksville
Posts: 282
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Quote:
Originally Posted by Rick_A
Is it possible that the CB in question is the Alternator Field breaker? In my plane, this is a 5A breaker on the panel.
I too used the Aeroelectric Connection schematics as the starting point for my electrical system and this is what Bob N. recommended. I presume it's to protect against short in the field itself or if the field wire is shorted to ground ....that and the fact that all circuits off the main power bus should have protective device installed close to the bus.
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No. The wire in question is the main B terminal on the alt.
__________________
Weasel
RV-4 715hr Sold
RV-10 "School Bus"
I have changed my User Name to the correct spelling as it became availible. Please direct all correspondence to Weasel
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