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08-14-2008, 10:56 AM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Which Wire Size?
Being electrically challenged I need to ask the question of VAF on what size wire to use.
Basically, I need to replace a 60 amp fusible link that I blew when I touched the hot side with a wrench.  I know, the 1st lesson in aircraft maintenance is to disconnect the battery. Lesson learned.....again. 
What I'm thinking is to replace it with a 60 amp breaker, leave the fusible link terminal in place to use the terminals for connections, and run power to the terminals through a new 60 amp breaker located on the panel so I can access it if needed.
Clear as mud? 
Looking up some tables it appears 8 Gage would do it, but there are 2 values in the table. One value is "Max AMPS for Chassis Wiring" another is "Max AMPS for Power Transmission" So I'm confused.
Any help would be appreciated.
Thanks in advance.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order. 
Last edited by Geico266 : 08-14-2008 at 10:58 AM.
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08-14-2008, 12:20 PM
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Join Date: Oct 2007
Location: Jackson, MS
Posts: 1,262
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Does size matter
You'll notice that 2 is used on the battery to things like the starter. Heavy surges warrant this. Also, the jumper between the relays in the plans are 2 pieces of copper bar but the buss bar is a single stock (0.125)
However, the 8 gauge is used from the alternator to a 60 amp breaker and 8 gauge is used around the panel for 60 amps jumpers for buss bars, etc.....
__________________
Webb Willmott
Jackson, MS
N32WW
Last edited by Webb : 08-14-2008 at 11:37 PM.
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08-14-2008, 12:44 PM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Quote:
Originally Posted by Webb
You'll notice that 2 is used on the battery to things like the starter. Heavy surges warrant this. Also, the jumper between the relays in the plans are 2 pieces of copper bar but the buss bar is a single stock (0.125)
However, the 8 gauge is used from the alternator to a 60 amp breaker and 2 gauge is used around the panel for 60 amps jumpers for buss bars, etc.....
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So #8 wire will do it? It will run from the firewall to the panel is all, about 5' round trip. I would hate to look like I had installed a smoke system.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
Last edited by Geico266 : 08-14-2008 at 01:24 PM.
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08-14-2008, 01:31 PM
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Join Date: Jan 2006
Location: Belgium
Posts: 645
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AWG8 = 57 Amp max?
"AWG8 wire is good up to 57 Amp, continuous duty, based on 150?C wire insulation ratings, for short wires".
This is from an "Exp. Bus technical bulletin" I have picked up somewhere from the internet, I can't remember where I got it from, though.
Since I am not sure how long a "short wire" is and I have a 60 Amp. alternator and I have 60 Amp. fuses for those big lines, I am going to install AWG6 to the alternator and to the main bus. Better be safe than sorry.
You may do as you please, it's your plane.
Regards, Tonny.
__________________
"Pilottonny"
Tonny Tromp
Lanaken, Belgium (EU)
RV9A, Registration: PH-VAN
ECI-Titan IOX-320 with dual EI, turning a Whirlwind 200RV CS prop.
Sold
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08-14-2008, 01:50 PM
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Join Date: Sep 2005
Location: Dothan, Alabama
Posts: 1,487
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why don't you just reinstall the fuseble link?
__________________
Alton DeWeese
N526RV RV7A Tip Up, IO360 180 W/Hartzel BA prop.
Flying ~950 hours since Aug 2010
N4IDH
Construction Log
?The secret of getting ahead is getting started. The secret of getting started is breaking your complex overwhelming tasks into small manageable tasks, and then starting on the first one.?
?Mark Twain
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08-14-2008, 02:17 PM
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Join Date: Oct 2007
Location: Jackson, MS
Posts: 1,262
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57 Amp continous duty
If my alternator was having to supply 57 amps continuous duty, it would need it's own exhaust system!!!!!
I know what you mean though.
__________________
Webb Willmott
Jackson, MS
N32WW
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08-14-2008, 03:18 PM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Quote:
Originally Posted by AltonD
why don't you just reinstall the fuseble link?
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I would if I could find one! I cannot find them anywhere, even at NAPA.
Also, why is it the 60 AMP fuses in the store are so small compaired to the fusible link? The link is .034 thick x .400, while the fuses at the auto store are .020 x .100 at best?
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
Last edited by Geico266 : 08-14-2008 at 05:08 PM.
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08-15-2008, 06:10 AM
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Join Date: Sep 2005
Location: Dothan, Alabama
Posts: 1,487
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__________________
Alton DeWeese
N526RV RV7A Tip Up, IO360 180 W/Hartzel BA prop.
Flying ~950 hours since Aug 2010
N4IDH
Construction Log
?The secret of getting ahead is getting started. The secret of getting started is breaking your complex overwhelming tasks into small manageable tasks, and then starting on the first one.?
?Mark Twain
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08-15-2008, 06:15 AM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Quote:
Originally Posted by AltonD
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Thanks for the link! The fusible link that was on the plane is really old. I's use your link to replace it. Thanks!
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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