i was today years old when i found out that the american wire gauge (AWG) system for measuring thickness of wires is logarithmic. going up +10 AWG means your resistance is 10 times higher*, and the starting point can be either 1 ohm / 1000 ft = 10 AWG, or 1 ohm / 1000 m = 15 AWG
* although your current carrying capacity is not 10 times lower
(chart from https://ohmslawcalculator.com/awg-wire-chart)
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@whitequark Do you know how the max current is estimated? (I wonder how the relationship between heat carried away by convection and wire diameter for a fixed temperature is modelled, and which wire orientation is pessimistic.)
@robryk @whitequark The current capacities seem conservative. I know you can put an amp through insulated 26AWG wire without it getting significantly warm.