This is a question that in the beginning was confusing but with a little research it all makes sense now.... Most common wires for AC and DC applications are rated at 600v which means they can handle up to 600v. You can use them in 12v systems and 240v systems but the size matters. The other way wires are rated at is in gauges better seen as AWG . This AWG is the most important number you will need to know becus it will tell you how many amps that wire will hold. for example if you have a 14 awg wire regardless of the volts you are using you can only run up to 15amps in that wire.
Bigger is better it does reduce loss but if you go to big your connections become difficult to work becus of the size of components.
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