Question: what is the difference between 12-2 and 12-3 romex?
Answer: The designation 12/2 indicates AWG 12 wire with two conductors (AC hot and AC neutral), 12/3 indicates AWG 12 wire with three conductors (two AC hot and AC neutral). ... AWG 12/2 is used for a single breaker 120V 20A max circuits. AWG 12/3 is used for double breaker 240V 20A max circuits.