To expand on the wire length issue...
Wires have resistance as well. The smaller the wire, the greater the resistance. The wire lengths given in AC43.13 have to do with the allowable voltage drop in the wire at a given amperage. AC43.13 has further charts to choose the wire size given ambient temperature, allowable wire temperature, altitude and weather the wire is by itself or in a bundle. These later charts are really overkill for our applications, but you get the idea that wire current carrying capacity has other variables, one of the important ones being size and length.
Sorry for the long post, but choosing the right size wire is an important safety issue.
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A&P, IA, Avionics Tech, and finally: Pilot! (12/28/06)
Dying to build an RV10. Not quite ready yet
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