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donmorrisey
Joined: 17 Mar 2007
Posts: 18
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 Posted: Mon Mar 16, 2009 7:46 am Post subject: Question on Z-11, Main Buss Feed |
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Howdy Listers C
I am using Z-11 as the basis for my wiring architecture. My question is on the 6 AWG wire between the battery contactor and the main buss. In my installation this wire will be running back through the firewall. Z-11 shows no protection for this wire but does show an ANL 60 current limiter between the starter contactor and the alternator.
A similar VFR elec drawing on the B&C website shows the 6 AWG wire between the battery contactor and the main buss being protected with a ANL 60 current limiter and also shows another ANL 60 current limiter between the starter contactor and the alternator.
So for this type of setup are two ANL 60's required or one???
Thanks. Don...
www.donsbushcaddy.com
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rv-9a-online(at)telus.net
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| Posted: Tue Mar 17, 2009 8:36 am Post subject: Question on Z-11, Main Buss Feed |
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In many applications, this connection is short (<6") or even a copper busbar between contactors. In this case, no additional protection is required.
In other applications this connection is much longer and should have primary protection. Depends on your configuration
Vern Little
[quote] ---
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nuckolls.bob(at)aeroelect
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| Posted: Wed Mar 18, 2009 4:34 am Post subject: Question on Z-11, Main Buss Feed |
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At 10:43 AM 3/16/2009, you wrote:
| Quote: | Howdy Listers,
I am using Z-11 as the basis for my wiring architecture. My
question is on the 6 AWG wire between the battery contactor and the
main buss. In my installation this wire will be running back
through the firewall. Z-11 shows no protection for this wire but
does show an ANL 60 current limiter between the starter contactor
and the alternator.
A similar VFR elec drawing on the B&C website shows the 6 AWG wire
between the battery contactor and the main buss being protected with
a ANL 60 current limiter and also shows another ANL 60 current
limiter between the starter contactor and the alternator.
So for this type of setup are two ANL 60's required or one???
|
Just one.
The alternator b-lead protection is intended to isolate
an alternator with failed diodes from the rest of the system
That current limiter is advised.
The feeder to a bus has a very low probability
of being faulted to ground . . . as are other
wires in the cranking circuit. Traditionally,
these wires do not get added protection. This
philosophy is described in the FARS for light
aircraft . . . specifically paragraph 23.1357 of
http://www.aeroelectric.com/Reference_Docs/FAA/Part23_electrical_A.pdf
I can't speak to anyone else's drawings but
know that Z-11 is in conformance with the legacy
design philosophies for light aircraft.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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