Color-code for residental wire <> for easy identification

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Orange 10ga for 30 Amp circuits

White 14ga for 15 Amp circuits

Yellow 12ga for 20 Amp circuits

Basic electric formula: Volts x Amps = Watts  ++  for safety, wires can carry 80% of rated load

14 ga wire ++  rated for 120 Volts x 15 Amp = 1800 Watts x 80% = 1440 Watts 12 ga wire ++ rated for 120 Volts x 20 Amps = 2400 Watts x 80% = 1920 Watts 10 ga wire ++ rated for 240 Volts x 30 Amps = 7200 Watts x 80% = 5760 Watts