I'm confused as to what awg wire I should use for the vans 75watt 2 bulb per wingtip landing lights. I figured the total wire length from panel to wingtip roundtrip was 40 feet (wire runs from panel to firewall to floor back through the spar to wing root 10 feet +wing length 10 feet *2).
At .00253ohms per foot (14awg)* 40 = .1012ohms
75 watts / 12 volts = 6.25 amps
6.25 amps * .1012ohms = .6325 voltage drop
Conductor chart page 11-30 figure 11-2 from AC43.13b shows I should use 10 awg. If my total length was 35 foot instead of 40 I could use a 12 awg.
Wire Table, Figure 8-3 of the Aeroelectric Cpnnection shows 14 awg running 15 amps within the 35C temp rise.
Am I way overestimating the distance of my wing wiring runs?
Do I run 1 14 awg wire to power both landing/taxi per wingtip totaling 12.5 amps and take the 1.265 volts lost?
Do I run 1 14 awg per light it's .6325 volts lost?
Seems like overkill but would you run the 10 awg?
Thanks,
Andy
At .00253ohms per foot (14awg)* 40 = .1012ohms
75 watts / 12 volts = 6.25 amps
6.25 amps * .1012ohms = .6325 voltage drop
Conductor chart page 11-30 figure 11-2 from AC43.13b shows I should use 10 awg. If my total length was 35 foot instead of 40 I could use a 12 awg.
Wire Table, Figure 8-3 of the Aeroelectric Cpnnection shows 14 awg running 15 amps within the 35C temp rise.
Am I way overestimating the distance of my wing wiring runs?
Do I run 1 14 awg wire to power both landing/taxi per wingtip totaling 12.5 amps and take the 1.265 volts lost?
Do I run 1 14 awg per light it's .6325 volts lost?
Seems like overkill but would you run the 10 awg?
Thanks,
Andy