Appropriate for a two-pole 20-amp breaker or a single-pole 30-amp breaker. 8-gauge or 6-gauge wire Used for 40-, 50- and 60-amp two-pole breakers; large appliances. Also used to serve subpanels.

Tandem breakers split a single-pole breaker slot into two 15—or 20-amp breakers, with two switches each controlling a separate circuit.