The correct wire size for a 15 amp breaker is a #14 wire.
The size breaker you use is determined by the size wire used in the circuit. If you use AWG #12/2 wire then use a 20 amp breaker. If you use AWG # 14/2 then use a 15 amp breaker.
Depends on the size of the wire going to the A/C. If the wire is AWG #10 you cannot install a 40 amp breaker. If the wire is AWG #8 you can.
30 amp breaker with #10 gauge copper wire
You use the correct size breaker depending on the size wire in the circuit. If the circuit is wired with AWG #12 wire use a 20 amp breaker. If it is wired with AWG #14 wire then use a 15 amp breaker.
Depends on the wire size used in the circuit. If you use AWG # 14 wire you must use a 15 amp breaker. If it is wired with AWG # 12 wire then you use a 20 amp breaker. If a AWG # 10 wire is used then a 30 amp breaker is required. The breaker protects the wiring from overheating so you must use the proper size breaker for the wire used.
Depends on what size wire was used in that circuit. AWG #10 wire requires the use of a 30 amp breaker AWG #12 wire requires the use of a 20 amp breaker AWG #14 wire requires the use of a 15 amp breaker Check the wire size in the circuit and you will know what size breaker to use. It is not going to be a 25 amp breaker.
The wire size for a 30 amp breaker is a #10 copper conductor which is rated at 30 amps. The only time a larger size wire will be used on a 30 amp breaker is when the distance to the load is a specific distance away from the distribution supply. The larger size wire is used to over come voltage drop.
50 amp breaker wired with AWG # 6 wire.
The minimum size wire to be fed from a 20 amp breaker is a #12 AWG.
Depends on the wire size you are using. If the generator breaker is a 30 amp then install a 30 amp breaker.
You need a 60 amp breaker.