nuckolls.bob(at)aeroelect
Guest
|
 Posted: Sun Apr 09, 2017 10:36 am Post subject: Is there M39029/63-3XX For 18 AWG Wire?!?!? |
 |
|
| Quote: |
Electrical system 2 has the battery under the rear seat so its electrical path is from the battery POS terminal forward to the CB, to the expensive MIL spec switch mounted on the panel, and then back to the POS D-Sub pins on the ignition module mounted way back on the cold side (front) of the firewall and then from the ignition module NEG pins forward to the NEG terminal of the battery mounted under the rear seat.
With these long distances I felt that 18 AWG wire was a good idea. |
Not very quantified . . .
Resistance of 22AWG wire = 0.016 ohms/foot = 16mv drop per amp per foot of wire
20AWG wire = 0.010 ohms/foot = 10mv drop per amp per foot of wire
18AWG wire = 0.006 ohms/foot = 6mv drop per amp per foot of wire
Assume 20foot round trip from battery(+) to battery (-) and
2 amps of appliance draw.
22AWG drops 0.640 volts
20AWG drops 0.400 volts
18AWG drops 0.240 volts
Assuming your power pathways totaled 20 feet and
you indeed require 2A of supply power, voltage
variations presented over the range of wire
sizes explored above are trivial.
Further, LightSpeed's passion for hooking
things right to the battery is without president
in certified general aviation. The only folks
I know of that do this routinely are the kids
with 1000 Watt boom boxes in their vehicles.
In fact, driving BOTH systems through a common source
configuration violates the common sense for in the
analysis and mitigation of failure modes.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
