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It’s measured in AWG (American Wire Gauge), and the lower the number, the thicker the wire. For shorter runs under 50 feet, 16-gauge wire works fine for bookshelf or smaller tower speakers.
Low energy-draw fixtures like lights and bedroom outlets will use 14 American Wire Gauge (AWG) with 15 amp circuits. 12 AWG wire will be used with 20 amp circuits to provide a bit more power to ...