AWG # 8 copper
The recommended wire size for a 40A circuit is typically 8-gauge wire.
The recommended wire size for a 50 amp breaker is typically 6-gauge wire.
When installing a circuit breaker, you size the breaker based on the wire size. The breaker should be matched to the ampacity of the wire to ensure proper protection against overloads and short circuits. The device being controlled by the breaker is not a determining factor in sizing the breaker.
The recommended wire size for a 20 amp breaker is typically 12-gauge wire.
The appropriate wire size for a 25 amp breaker is typically 10 gauge wire.
The appropriate wire size for a 30 amp breaker is typically 10 gauge wire.
The recommended wire size for a 25 amp breaker is typically 10 gauge wire.
The recommended wire size for a 30 amp breaker is typically 10 gauge wire.
The recommended wire size for a 50 amp breaker is typically 6-gauge wire.
The recommended wire size for a 60 amp breaker is typically 6-gauge wire.
The recommended wire size for a 35 amp breaker is typically 8 AWG (American Wire Gauge) for copper wire.
For a 30 amp breaker, you will need a wire that is at least 10 gauge in size.