Wire Gauge Ampacity

Basics

• Copper resistivity - 100 compared to aluminum 160. [1]
• Aluminum has about 60% the conductivity of copper, but 30% the weight for a given diameter. All together, aluminum cable is half the weight of copper for the same ampacity. [2]

Tables - Copper

• https://www.engineeringtoolbox.com/wire-gauges-d_419.html
• http://wiki.xtronics.com/index.php/Wire-Gauge_Ampacity

Copper Clad Aluminum (CCA)

• [3]

Free Air

• "Directly from 4-004(1)(a), you must maintain a cable spacing not less then 100% of the larger cable diameter" - [4]

22 Ga for D3D

• At 24V we need 5A for the main power supply, so 22 ga should be good. 80C rating of [5]. Engineering Toolbox says 1 strand is good for 5A.