30 AMP breaker question

The wiring attached to the breaker would no longer be protected. The wire is probably #10 at 35 or 40 amp load, the wire would heat. Result probably a fire. Why do you want a 35 or 40 amp circuit?

Unless they really oversized the wire, you do not want to do that.

* The national electric code (NEC) specifies that the overcurrent protection device not exceed 30A for 10 AGW wire, 20A for 12 AGW wire and 15A for 14 AWG wire.

Changing out CB to higher amp rating is not a good idea.
Either learn to manage load OR replace weak CB with same amp rating

Typical AMP Load Chart...RV LINK

If you were to use a 30 to 50 amp dogbone to connect to 50 amp, you could pull more power than the lines are capable of. Fire.

homerbw wrote:
Sorry but I just have to ask. Realistically what would happen if I were to replace the 30 amp circuit breaker in the MH with a 35 or 40 amp breaker?

More than likely nothing. You would still be limited to 30 amps by the breaker at. The power pedestal. Now, if you were plugged into the 50 amp outlet with a dog bone 50/30 adaptor then you would risk the possibility of over loading the wiring between the power pedestal and the coach breaker box. The individual circuits would still be protected by the breaker for each circuit.

Be sure to leave a camera close so you can get a picture of it as it goes up in flames.

homerbw wrote:
Sorry but I just have to ask. Realistically what would happen if I were to replace the 30 amp circuit breaker in the MH with a 35 or 40 amp breaker?

The wire becomes the fuse. :E

I have seen people run an extenison cord out through a slide out or window and plug into the 20amp at the pedestal, for extra power, such as elect heater.

Kiwi_too wrote:
If you were to use a 30 to 50 amp dogbone to connect to 50 amp, you could pull more power than the lines are capable of. Fire.

That dog bone adapter only connects one hot leg of the 50A receptacle.
Main 30A breaker in rig panel would trip IF overloaded.

Old-Biscuit wrote:

Kiwi_too wrote:
If you were to use a 30 to 50 amp dogbone to connect to 50 amp, you could pull more power than the lines are capable of. Fire.

That dog bone adapter only connects one hot leg of the 50A receptacle.
Main 30A breaker in rig panel would trip IF overloaded.

The OP's question was what would happen if he replaced the main breaker in the motorhome with a breaker with a higher value.

Yes,,the adaptor would use one of the 50 amps legs, so if the OP put a 40 amp main breaker in the motorhome then it would draw that much power through wiring sized for 30 amp. Not likely to happen as its pretty hard to find single pole breakers higher than 30 amp.