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Wiring

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Ken

Joined: 06 Jun 2008
Posts: 15

Posted: Sun Oct 26, 2008 6:43 am Post subject: Wiring

I am an electronics hobbyist; therefore, I am not intimidated by the idea of wiring my XL.  I still purchased the Homebuilt Help CD on wiring just to learn any peculiar aspects of aircraft wiring.  On the CD they suggest a master breaker for the bus bar in addition to all the breakers that branch off of it.  Its not a bad plan, but my concern is that if the breaker fails or trips, you loose everything over a single issue.  I'm curious as how the rest of you dealt with this issue.



Ken

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jaybannist(at)cs.com
Guest

Posted: Sun Oct 26, 2008 7:03 am Post subject: Wiring

Ken,

 

 I see a master breaker as "double jeopardy." I don't see the need for one and I don't have one in my system. Most of my system goes through the battery contactor, but the endurance bus is wired (through a switch) directly to the battery.  

 

 Jay in Dallas 

 

   

 

   

 

 --

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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Sun Oct 26, 2008 7:11 am Post subject: Wiring

I have my battery connected to my main fuse panel through the master  

relay. I don't have a main breaker or fuse in that line, the master  

relay is the only circuit protection for the battery cable. The  

battery cables are secured and protected to prevent any chafing that  

might cause a short. A short in the main battery cable will get your  

attention very quickly, allowing you to interrupt the current with the  

master switch. I don't see the need for a circuit breaker in addition  

to the master relay. I do have a main fuse in the alternator cable  

since it doesn't feed through the master relay. I have used aircraft  

wiring throughout the cabin, in the case of a short circuit, the  

insulation on this wire will not support combustion and will not give  

off toxic fumes.



On Oct 26, 2008, at 10:43 AM, Ken wrote:



 	  Quote: 	
		   



 I am an electronics hobbyist; therefore, I am not intimidated by the  

 idea of wiring my XL.  I still purchased the Homebuilt Help CD on  

 wiring just to learn any peculiar aspects of aircraft wiring.  On  

 the CD they suggest a master breaker for the bus bar in addition to  

 all the breakers that branch off of it.  Its not a bad plan, but my  

 concern is that if the breaker fails or trips, you loose everything  

 over a single issue.  I'm curious as how the rest of you dealt with  

 this issue.




	




-- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus redrive.

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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

craig(at)craigandjean.com
Guest

Posted: Sun Oct 26, 2008 8:40 am Post subject: Wiring

Have you looked at Bob Nuckolls' AeroElectric book? He is acknowledged as an

expert in this area and participates in an active forum of the same name on

Matronics.



http://www.aeroelectric.com/



The book is actually three-hole punched sheets. The appendix contains

schematics and the design rational for about 20 different situations.



As to your specific question Bob would probably recommend a fusible link for

your ultimate protection. But for safety your plane should be designed to be

flyable even if your battery/alternator were dead. I don't know what engine

you are looking at but with a traditional magneto your engine will run with

no battery power. For the auto conversions some go as far as to have two

batteries.



For instruments traditional gauges of course don't need power (day VFR). If

you chose a glass panel most of the manufactures have a provision for a

back-up battery.



-- Craig

--

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Geoff Heap

Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey

Posted: Sun Oct 26, 2008 2:06 pm Post subject: Re: Wiring

The thing that’s confounded me for months is what kind of switch I need for a Master and what size fuse to go with it. Today I asked myself. Why do I even need it? I only have basic knowledge of how to make circuits work. Beyond that I have to seek help. So this thread has been illuminating for me. Ken points out that adding a fuse here is basically worthless and if faulty will lose you everything. I can now proceed. Thanks Guys…….Geoff

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