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Old 01-19-2021, 10:23 PM
TASEsq TASEsq is offline
Join Date: Aug 2017
Location: Melbourne, Australia
Posts: 303
Default Wire Size Round Trip or Not

I am planning wiring for my wings and want to use the Garmin GAP26 pitot.

I measure it probably to be around 20ft in wire length from the panel out to the pitot. (40ft would be the return length).

The G3X manual says 12amps at -40C initially, and 10amps at 0C, so i think 10 amps is a reasonable value for the current draw.

Looking at AC43 for 20ft at 14V, the table says a 13AWG wire (so 12 AWG). If i consider the total wire run as being 40ft it would be 10AWG wire!!

The 12AWG wire needs a 30A breaker according to AC43, but the garmin manual says 20amp.

Am i supposed to consider the return path of the wire?

I know that most people on the RV14/RV10 use 14AWG wire I'm not sure what to make of the wire charts. Thoroughly confused.
Trent Stewart
Melbourne, Australia
Aug 2021
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