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aaa(at)pacifier.com
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 Posted: Thu Apr 13, 2006 6:09 am Post subject: Wire gage VS length of run on Z14 |
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I am building an RV9A with the Z-14 as my electrical system. I need
help understanding what gage of wire to use in a few spots.
In particular there are some specifications on the schematic that
state the run should be 6 inches or less from the battery contactors to
the batt bus. 10 AWG is recommended for these runs, but the load on
these buses should be very light.
Why the length restriction, and if I can't place the bat buses
within 6 inches of the contactors how should I figure the correct wire gage?
Same type of question for the 4AWG from the Aux batt to the contactor
Thanks,
Duane
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nuckollsr(at)cox.net
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| Posted: Thu Apr 13, 2006 6:31 am Post subject: Wire gage VS length of run on Z14 |
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At 07:08 AM 4/13/2006 -0700, you wrote:
| Quote: |
I am building an RV9A with the Z-14 as my electrical system. I need
help understanding what gage of wire to use in a few spots.
In particular there are some specifications on the schematic that
state the run should be 6 inches or less from the battery contactors to
the batt bus. 10 AWG is recommended for these runs, but the load on
these buses should be very light.
Why the length restriction, and if I can't place the bat buses
within 6 inches of the contactors how should I figure the correct wire gage?
Same type of question for the 4AWG from the Aux batt to the contactor
|
The Z-figures are illustrative of ARCHITECTURES. All wires, breakers,
fuses, etc should be sized in accordance with the details of
equipment you choose to install. The values shown are typcial but
not necessarily applicable to YOUR project.
Battery busses should be as close to the battery as practical.
The industry practice is that small feeders of 6" or less do
not represent a significant hazard to flight if they should
be faulted to destruction. If you're going to extend a battery
bus, then it becomes just another main, aux or e-bus. In this
case, practice suggests that you provide it with its own
mini-contactor like the e-bus fat feeder shown at:
http://www.aeroelectric.com/Pictures/Schematics/E-BusFatFeed.gif
If it's a battery bus, then it's close to the battery and
is fitted with fuses no larger than 7A. Again, an industry
practice . . .
Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
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