Depends on the wire size you are using. If the generator breaker is a 30 amp then install a 30 amp breaker.
Answer for USA, Canada and countries running a 60 Hz supply service.It is not a recommended procedure. Depending on what size service entrance cable it is the wire size will be too large to fit into the breaker and range lugs. Cutting strands off of a larger size wire to fit into the lugs is not acceptable. If this is new construction then the electrical inspector will reject the installation for not using the properly sized cable to feed the range. Use the proper size cable and feel free that there is not going to be any problems further on. The wire should be 3 conductor #8 fed from a two pole 40 amp breaker.
25 amp breaker
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.
In North America the standard sizes for breakers are 15, 20, 30, and 40 amps. The 15 amp size breaker is used in general circuit wiring. The 20 amp size breaker is used for dedicated appliance receptacles, hot water tank and baseboard heating. The 30 amp size breaker is used for a clothes dryer. The 40 amp size breaker is used for the electric range.
4sqmm
The biggest circuit breaker in any home is the main breaker located in your main breaker panel that is installed where your electrical service cable comes into your home.
size 6 rings start at 10 then just add the size to it,lets say its a size 6 so,10+6=16mm
Assuming being fed by c32 breaker for start load minimum cable size SWA is 70mm which will go to 456 meters
6millimeter square.
16mm
The wire is sized to the maximum overcurrent protection device (Max circuit breaker) ampacity. This is listed on the nameplate of the outdoor condensing unit. Size the wire to match the breaker.
what is the current carrying capasity of 16mm cable
cabla sq,mm to amps
16mm
I would use a 5/8 drill bit which is almost exactly 16mm.
16 mm square