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10-31-2014, 04:47 PM
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Join Date: Nov 2008
Location: Shreveport, LA
Posts: 1,002
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Z-11 wiring diagram question
I think I have decided to use the Z-11 wiring diagram for my plane. But, I do not understand what the fuseable link in the picture below is protecting. What would cause this fuseable link to blow? Why is it there?
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10-31-2014, 05:47 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,668
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Just think of the fuseable link as a slow-blow fuse, it is also able to handle surges better than a standard fuse. Like all other "fuses" its there to protect the wiring.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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10-31-2014, 06:17 PM
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Join Date: Apr 2008
Location: California
Posts: 652
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It is there to protect the wire that runs from the main power buss to the battery master switch. In the first position, the master switch connects the battery to the main buss, but the path from the main buss to the alternator field is not yet connected, and neither is the field circuit breaker.
The fusible link is an inexpensive fuse to protect that energized wire should it (unlikely) be shorted to ground through a chaffed wire or bad switch. You will note that all other wires from the main buss are fused.
Don
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RV-8 QB Titan ECi 191HP XIO-360
WW200RV Dynon D180 HS34 AP74
GNS430 SL30 GTX327 PS8000B Uavionix Echouat
"Pilots are alchemists... we turn gold into lead."
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11-01-2014, 04:45 AM
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Join Date: Nov 2008
Location: Shreveport, LA
Posts: 1,002
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Would it be correct to say that if the switch was not there, that the alt field breaker would be sufficient for protecting this wire?
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11-01-2014, 05:50 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,668
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Quote:
Originally Posted by blueflyer
Would it be correct to say that if the switch was not there, that the alt field breaker would be sufficient for protecting this wire?
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Not really, the Link protects the wire all the way back to the buss, the field CB purpose is to interrupt the field current should something in the alt/reg go bad or an overvoltage occurs.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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11-03-2014, 04:42 AM
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Join Date: Nov 2008
Location: Shreveport, LA
Posts: 1,002
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ok, I am following that. But, is the fuseable link located at the bolt where the buss bar receives power for a reason, or could the fuseable link be located anywhere along the length of the buss bar?
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11-03-2014, 06:13 AM
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Join Date: Apr 2008
Location: California
Posts: 652
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Anywhere along the buss bar is fine. Electrically speaking, you could show the buss bar as a single point. Graphically and physically that is inconvenient.
Don
__________________
RV-8 QB Titan ECi 191HP XIO-360
WW200RV Dynon D180 HS34 AP74
GNS430 SL30 GTX327 PS8000B Uavionix Echouat
"Pilots are alchemists... we turn gold into lead."
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11-03-2014, 06:29 AM
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Join Date: Nov 2008
Location: Shreveport, LA
Posts: 1,002
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thanks Don and Walt. Sometimes a novice comes up with weird concerns. thanks for educating me.
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11-03-2014, 08:50 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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To fabricate the link correctly, fiberglass sleeving should be used.
http://www.aeroelectric.com/articles.../fuselink.html
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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