Originally Posted by kennyairport
the post breaker keeps tripping cg electrician changed breaker tripped again in less than 1 hour. he came back and switched from black line power to red tripped 1 more time. dw thinks it might be some sort of wiring inside the trailer if it's intermittent it could be impossible to locate and how intense would a dealer look for it.
Making some assumptions here, I will assume you have a 30 amp trailer since you also said the electrician was able to swap hot lines for the circuit breaker and he just swapped L1 (black) out with L2 (red).
You could have a problem, or you could also just be overloading the 30 amps (very common thing to do). If on a 30 amp power supply, you have to practice energy management. You are basically limited to 30 amps of electric usage. Your air-conditioner is your biggest energy hog, followed by microwave and water heater electrical heating element. Many times, these 3 things on at the same time, will trip the breakers (either your RV's main breaker or the campground pedestal 30 amp breaker). Space heaters are also culprits many times.
This doesn't include the amps that may be being used by your converter, fridge on electric, television, or anything else that's on and plugged into an electrical outlet in your RV. Most RV'ers with 30 amp power supplies have to learn energy management, and what items can be on (and thus which ones must be off) at the same time to keep from overloading the 30 amps.
Many times, just running the water heater on propane only will solve a lot of tripping circuit breaker problems.
Here is some more reading on the subjects. Even if this isn't your problem, it's good information to know and understand:
Basic RV Electricity - RV Information (RV Maintenance)
Here is an excerpt from the link above:
Even with a 30 Amp service you need to be selective about what you are using. If you try to use too much the RV will let you know by tripping a breaker in the distribution box and hopefully no harm will be done. There is a short formula that may help you with this. 30 Amps X 120 Volts = 3600 watts. This is the total amount of power you can use before you overload the system. Think of it like this, with 3600 watts you could use 36 one hundred watt light bulbs. When you turn on the 37th light you will probably trip a breaker.
and more reading:
RV Converters and Amp Draw - RV Information (RV Maintenance)
Hope this helps and it just something that easy.