Someone mentioned that using anything bigger than 18AWG was pointless, I'd like to remind everyone that if you ran a thicker wire anywhere outside the mechbox, it WILL reduce the resistance.
All wires (except superconductors) have some amount of resistance, and if you do a series circuit of half 18AWG and half 14AWG it will most definitely have less resistance than a full 18AWG circuit.
Lastly, is it that much more expensive for a meter of wire larger than 18AWG?
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